. A contribution to American thalassography; three cruises of the United States Coast and geodetic survey steamer "Blake," in the Gulf of Mexico, in the Caribbean Sea, and along the Atlantic coast of the United States, from 1877 to 1800. Blake (Ship); Marine animals -- Atlantic Ocean; Marine sediments; Ocean. CHARACTERISTIC DBEP-SEA TYPES. GASTEROPODS. 69. Fig. 287. — Leptothyra iiiduta. i. 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 f
. A contribution to American thalassography; three cruises of the United States Coast and geodetic survey steamer "Blake," in the Gulf of Mexico, in the Caribbean Sea, and along the Atlantic coast of the United States, from 1877 to 1800. Blake (Ship); Marine animals -- Atlantic Ocean; Marine sediments; Ocean. CHARACTERISTIC DBEP-SEA TYPES. GASTEROPODS. 69. Fig. 287. — Leptothyra iiiduta. i. 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 fossilifer- ous rocks of the Cambrian, and to the dredo-- ings of the "Hassler" and the " Blake " are due the only knowledge yet acquired of its soft parts. Two species are found in the West Indies, of Avhich the finest is P. Adansoniana (Fig. 288), from about 200 fathoms. The shell is four inches in diameter, richly pearly within, and orna- mented with elegant red and brown colors exter- nally. The anal notch in this species extends nearly half the length of the last whorl. A second sj^ecies, less brilliant and with a shorter notch, is P. Quoy- Fig. 288.—Pleurotomaria Adansoniana. |^. ,f-^. ctcifw i i ana (rig. lov), also ob- tained living by the " ; Among other univalves, the Mar- ginellidae are represented by such species as Marginella succinea Con- rad, extending from shallow water to several hundred fathoms, and 3f. Watsoni (Fig. 290), characteristic of great depths. The Ringiculidie, of which many species are known fossil, are illustrated by 7?. leptocJieUa (Fig. 291), described first by Brug- none from the Mediterranean, and afterward from deep water. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectocean, bookyear1888
