5S9 WORMS. TESTACEA. 82. Nerka; 



,3. Chemn. conch. 9. tab. \i\.fig. 1086, 1087. a— 1. 



4. Chemn. conch. 9. /. 124./*, 1080, 1081. 



Inhabits rivers of Europe and Barbary : 4 lines ,Jong» 

 Shell ovate with 3 whorls, the 2 fmall ones lateral, generally 

 marked with fcaly fpota ; pillar white. 



* Littoralis Shell fmooth, with a carious crown and 4 whorls. 



Doncvans Brit, fliells. tab. 20. Jig. 2. 

 Pennant Brit.Zool. iv. /, 87./". 143. 



£/.f/*r /. 60.7./. 39, 40 Anim. Angl. i. 3./. II, 12, I 3. 

 £/;/« o/fr. tab. 1. Jig. 25, 26. 

 Inhabits Tea rocks of Europe: fize of a horfe-bean. 

 Shell yellow or ferruginous, with ,cr without bands fpots or dots 

 of various colours. 



*Laeu(lr:s. Shell fmoothifh horny or black ifli, ending in an exquifitely 



fine point. 

 Gualt. tejl. tab. /[.Jig. M M. 

 Inhabits ftill waters and warm fprings of Europe, very much re- 



refemblcs the laft, but is horny or blackifli and fometimes 



dotted with white. 



Magdalene Shell with wide grooves, black within white, the lip yel- 

 lowifh : lid fmooth 2-toothed. 

 Adans Jeneg. I . tab. 1 3. Jig. 5. 

 Inhabits Magdalen Jfiands : 6 lines long. 

 Shell with 3 whorls, and recurved approximate teeth on the lid. 



Marginata. Shell thin, with decollate ftriae, tuberculate, black with 

 ochraceous fpots, fubglobular: aperture margined 

 outwardly. 



Inhabits Schrcet. Einl. in conch. 2. tab 4. fig. 16. 



Shell glabrous within ; outer margin of the aperture cancellate : 

 pillar flat. 



Pufca, Shell thin pellucid ovate polilhed, dull yellow varied with 

 black : outer-lip acute, inner glabrous. 

 Chemn. conch. 5, tab. ig^-Jtg. 2019, 2020. 

 Inhabits - — very rare : cronxin prominent. 



*Pellucida. Shell fmooth pellucid, with 3 whorls. 

 ^ranjacl Lin^.Soc. ill. p. 6y. 

 Found on the PembrokeJkire coajl. very minute. 



* Alb Shell fmooth fubpellucid, with 2 whorls. 



Iran/ad. Linn. Joe. ill. p. 67. 



Found on the P embrokejhire coa(l> very minute. 



C. Im* 



