. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. GASTEROPODS. 69 the case of the former to the application of several specific names The depth in which these have been found varies from 125 to over 1,000 fathoms. Pleurotomaria is one of the most remark- able forms dredged in the continental region. Four recent species of the genus are known. Its history dates back to the earliest fossifer- ous rocks of the cambrian, and to the dredg- ings of the "Hassler" and the " Blake " are due the only knowledge yet acq
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. GASTEROPODS. 69 the case of the former to the application of several specific names The depth in which these have been found varies from 125 to over 1,000 fathoms. Pleurotomaria is one of the most remark- able forms dredged in the continental region. Four recent species of the genus are known. Its history dates back to the earliest fossifer- ous rocks of the cambrian, and to the dredg- ings of the "Hassler" and the " Blake " are due the only knowledge yet acquired of its soft parts. Two species are found in the. Fig. 287. — Leptothyra induta. '.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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