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animal pole anterior appears archenteron artery attached becomes blastomeres blastopore body branches capsule cells cerata Chiton cleavage cavity closely colour completely condition connection considerable continuous described direction divided division dorsal dredged early embryo evidence external fact Figure four furrow genital gives half inch increase indicated individual inner larger later length less Limax limpet living margin marked mass mesoderm nature Nautilus Nereis normal notes observed obtained occur opening organ origin pair pass period plane Plate portion position posterior present probably quartet reference regard region rein relations represented rock round rows seems seen shell shown side similar smaller spaces species specimens spiral stage structure suggested surface taken teeth tentacles trace transverse ventral wall young Zool
Página 122 - The BULLETIN and MEMOIRS are devoted to the publication of original work by the Professors and Assistants of the Museum, of investigations carried on by students and others in the different Laboratories of Natural History, and of work by specialists based upon the Museum Collections and Explorations. The following publications are in preparation : — Reports on the Results of Dredging Operations from 1877 to 1880, in charge of Alexander Agassiz, by the US Coast Survey Steamer "Blake,
Página 202 - We submit, therefore, that § 10. A name should be changed which has before been proposed for some other genus in zoology or botany, or for some other species in the same genus, when still retained for such genus or species.
Página 346 - Memoirs is sold separately. A price list of the publications of the Museum will be sent on application to the Director of the Museum of Comparative Zoology, Cambridge, Mass. OF THE DIEECTOE OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE TO THE PRESIDENT AND FELLOWS OF HARVARD COLLEGE FOR 1912-1913.
Página 233 - ... ossse nasi, which became necrosed, loosened and were removed from cases of late syphilis. These fragments of bone present as natural a conformation in many instances as in their healthy condition. As far as I have been able to observe, there seems to be a special predilection in cases of late syphilis for those parts supplied by the fifth nerve, indicating that the portion of the sympathetic system which presides over these parts is particularly sensitive to the syphilitic impression. I have...
Página 122 - These publications are issued in numbers at irregular intervals; one volume of the Bulletin (8vo) and half a volume of the Memoirs (4to) usually appear annually. Each number of the Bulletin and of the Memoirs is sold separately. A price list of the publications of the Museum will be sent on application to the Director of the Museum of Comparative Zoology, Cambridge, Mass.
Página 31 - Limax maximus, it was not possible to employ the method described by Miss Henchman ('91) for shelling the eggs. But by inserting two fine cambric needles in one holder, so that the distance between the points is less than the diameter of the unshelled egg, it is possible to hold the egg between these two needles and pierce it by a third. A quick shear-like cut with the third needle against one of the other two tears open one side of the egg and allows the albumen and the ovum to escape from the envelopes....
Página 136 - ... this manner, in comparatively shallow water, and the animals were so taken in the time of Rumphius, at the end of the seventeenth century. Traps seem never to have been tried for them in deep water. The fact that the living Nautilus was obtained from 320 fathoms, shows that it occurs at great depths. It is probably a mistake to suppose that it ever comes to the surface voluntarily to swim about. It is probably only washed up by storms, when injured perhaps by the waves.
Página 442 - ARCHIDORIS FLAMMEA, A. and H. Near the Duke Rock a sponge of Desmacidon-like appearance, with prominent oscula, but of a bright red colour, is very common ; and while looking over a quantity of the sponge early in April last I found an individual of this species feeding upon it, in dimensions just under three quarters of an inch long and half an inch broad. The colour of the Nudibranch closely approached that of the sponge, but had a more orange tinge. There were a few scattered purplish spots in...