﻿59 



fi 



j 



T H 



N 



T 



R 



H 



R 



DIVISION 



Of 



f 



I. 



UNIVALVES 



ARTICLE 



I. 





Offimple Univalves, or Univalves ivhofe cavities are formed into no regular fpire$ y 



but generally remain open to the immediate view, 



IPHONIUM I. Subaquale angulatum & flexuofum. 



■ 



The angular and varioufly writhed Worm-tube. 



This is very frequent on 

 t of the feas about Jamai 



the furface of mod flones and other hard bodies taken 



SIPHONIUM 2. Conicum nitidum nidulans. 



The fmooth, ftraight, fliining Worm-tube. 



This is the fkill of the teredo navalis or (hip- worm, and is common in moft pieces 



of wood that lie for any time in the fea, in thofe warm 

 from one eighth to a quarter of an inch, or better, in diameter 



it 



generally 



SIPHONIUM 3. Conicum in fpiram tortum, fpird libera, 



■ 



The conic fpiral Worm-tube, 



SIPHONIUM 4. Rugofum varie contortum. 



The rugged and varioufly writhed Worm- tube. 



frequent on all the rocks about Jamaica, and generally met with of all 



This is 

 fhapes and fizes j but is mofr, commonly flatted 



fixed. 



the iide by which 





/ 



SIPHONIUM 5. Minus longitudinaliter Jl 



& varie contortum 



The ftriated and varioufly writhed Worm-tube. 



This tubular fabrick is frequent on moft of the oyfter-fhells and fmall pebble 



the Weft- India feas. 



DENTALIUM 1. Minus conicum album, tubo leniter arcuato. 



Thi 



is 



Indies, 



The fmall, white, and flightly arched Tooth-fhelL 



the only one of this tribe I have obferved in thofe parts of the Weft- 



Before I proceed 

 divide them into. 1, 



to an enumeration of the fpecies of the following genus, I (hall 



Thofe that are quite plain, and without any aperture at the apex. 



Such as are alfo plain, but have an aperture at the apex. 3. Such as have the apex 



arching 



limp 



a little backwards from the main perpendicul 

 4. Such as are furnimed with a valve that 



mmonly called cap* 

 fome part of the ca- 



ty, generally called decked limpets, 5. Such as have fomething of an irregular, 



ii 



de, 



apex 



the 



ke, hollow and obveriely femiconical fpur rifing from 



" d chamber limpets, And, 6thly, fuch as have a very fmall degree of 





ding in the ap 



I. 



■ 



' 



■ 



