The Shipley Collection of Scientific Papers, Volumen91878 |
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Página 231 - Annual Report. Presented by the President to the Board of Trustees, reviewing the operations of the University during the past academic year.
Página 231 - VI in progress. $3 per volume. III. American Journal of Philology. BL GILDERSLEEVE, Editor. Quarterly. 8vo. Volume V in progress. $3 per volume. IV. Studies from the Biological Laboratory. Including the Chesapeake Zoological Laboratory. HN MARTIN, Editor, and WK BROOKS, Associate Editor. 8vo. Volume III in progress. $5 per volume. V. Studies in Historical and Political Science. HB ADAMS, Editor. Monthly. 8vo.
Página 37 - BRODERIF, PZS, 1833, p. 124. — REEVE, Conch. Icon , pi. 1, fig. 3, 1862. Panama to Peru. Type of the subgenus. I have examined an immense number of specimens from Panama, and find that they exhibit many varieties. The apex of very young shells is circular, whitish, and of a different texture from the remainder of the shell. This circumstance was first pointed out by Mr. ES Morse. The nucleus is probably the remains of the embryonic shell. The species has no radiating striae, and is a thinner shell...
Página 11 - The mouth is, as usual, just in front of the posterior junction of the brachial bands, and is in a rather long flexuous groove, the edges of which are of a dark brown color, and somewhat thickened. The upper or posterior lip, if such it may be called, has a forward prolongation or convexity in the median line, to which a slight concavity or indentation in the lower lip corresponds.
Página 6 - Pourtales were nearly .1 of an inch in length. The characteristic sculpture was developed upon them to the very apex of the shell. The nucleus was already gone, being probably deciduous or soon lost by attrition upon the rocks to which the young shells attach themselves. The various muscles were already well developed. The mouth was as described in the young of the T. cubensis. The intestine was short, cylindrical, and straight. The lower portion was embraced by a few hepatic digitations. These lobes...
Página 11 - W. australis ; hence the greater separation. The longest of the brachial cirrhi, in front, measure about .14 inch in length ; those of that part of the band which passes behind the mouth are about the same length. They are, as in other species, disposed in a double row, the cirrhi of one row being opposite the spaces of the other. The spiral portion in the middle lobe makes about two complete turns. With regard to their disposition and the manner in which the cirrhi are set upon the brachial band,...
Página 20 - The nervous system was not traced out, but the oesophageal ganglia presented no special peculiarities. The border of the mantle appeared to be ciliated. The peduncle, so wide and short as to resemble a mere muscular disk, was strongly attached to the shell by the peduncular muscle, beside which a broad tendinous band appeared to pass entirely across, in front of the dorsal adjusters (posterior retractors of Owen), giving an additional solidity and firmness to the attachments of the peduncle. The...
Página 36 - ... type specimens is very clear, and was put on record at the time. Lamarck constituted the genus Discina to receive a shell which he called D. ostreoides, but of which he did not give any figure or specific description. The specimen was received from Mr. J. Sowerby, and is the same species and from the same lot of specimens, as the shell described by Mr. GB Sowerby in the Lin. Transactions, and well figured by him there, under the name of Orbicula norvegica. His very excellent figure enables me...
Página 8 - Raphael!» 1.75 1.30 1.00 Thus it is seen that the smallest species is by far the widest and most inflated, proportionately ; the second species is the flattest, in proportion to its length ; and the third is the most elongated. I have taken the largest adult specimens of each species for comparison ; that of the septigera being far larger than the ordinary form of that species, as it is one collected by JIUSEUM OF COMPARATIVE ZOOLOGY. 13 Mr. Jeffreys, FRS, on the British Deep-Sea Dredging Expedition,...
Página 14 - It has been stated by some authors that Savigny's name was Argyope or Argyopes, and hence not synonymous with Argiope, Desl. ; but this is an error, which a reference to Thorell's paper, or to the original work of Savigny, will enable any one to correct.