550 WORMS. TESTACEA. 82. Nerita; 
3. Chemn. conch. 9. tab. 124. fig. 1086, 1087. a—l. 
4. Chemn. conch. 9. t. 124. f. 1080, 1081. | 
Inhabits rivers of Europe and Barbary: 4 lines long, 
Shell ovate with 3 whorls, the 2 fmall ones lateral, generally 
marked with fcaly {pots: pil/ar white. 
9 Littoralis Shell fmooth, with a carious crown and 4 whorls. 
Doncyan’s Brit. fhells. tab. 20. fig. 2. 
Pennant Brit. Zool, W. t. 87. f. 145. 
Lister t. 607. f. 39, 40. Aum. Angl, t. 3. f. 11, 12, 13. 
Klein offr. tab. 1. fig. 25, 26. 
Inhabits fea rocks of Europe: fize of a horfesbean. 
Shell yellow or ferruginous, with or without bands fpots or dots 
of various colours, 
©Lacufris. Shell fmoothifh horny or blackifh, ending in an exquifitely 
fine point. 
Gualt. tef. tab. 4. fig. M M. 
Inhabits ftill waters and warm fprings of Eurose, very much re- 
refembles the laft, but is horny or blackish and fometimes 
dotted with white. 
Magdalene Shell with wide grooves, black within white, the lip yel- 
lowifh : lid fmooth 2-toothed. 
Adans feneg. Y. tab. 13. fig. 5. 
Inhabits Magdalen Iflands: 6 lines long. 
Shell with 3 whorls, and recurved approximate teeth on the lid. 
Marginata. Shell thin, with decuffate ftria, tuberculate, black with 
ochraceous fpots, fubglobular: aperture margined 
outwardly. 
Inhabits —Sebrat. Einl. in conch. 2. tab. 4. fig. 16. 
Shell glabrous within: outer margin of the aertare cancellate: 
pillar flat. 
Dubia. — Shell thin pellucid ovate polifhed, dull yellow varied with 
black: outer-lip acute, inner glabrous. 
Chemn. conch, 5. tab. 193. fig. 2019, 2020. 
Inhabits very rare: crown prominent. 
* Pellucida. Shell fmooth pellucid, with 3 whorls. 
Tranfatt. Linn. Soc. iit. p. 67. | 
Found on the Pembrokeshire coaf. very minute. 
e Aba Shell fmooth fubpellucid, with 2 whorls. 
1 dranfadi. Linn. foc. ii. p. 67. 
Found on the Pembrokeshire coafly very minute. ET 
. Im 
