258 MOLLUSCA. PULMONIFERA. Cyclostoma. 



Cochlea cinerea, List. An. Ang. 119, Conch, t. xxvii. f. 25 — Nerita ele- 

 gans, Mull. Hist. Verm. ii. 177 — Turbo tumidus, Penn. Brit. Zool. 



iv. p. 128 Turbo elegans, Mont. Test. Brit. 343.— Cycl. el. Drap. 



Moll. 32 Under moss and the roots of ferns, England. 



Length of the shell upwards of half an inch, brownish, spiral striae dis- 

 tinct ; a minute pillar cavity ; lid diverging, striated. The animal is brown- 

 ish, with a long emarginate "snout. Some details of anatomical structure are 

 given by Lister, Tab. Anat. iv. f. 1, 2, 3. 



53. C subcylindricum. — Whorls 4 to 5, cylindrical, sum- 

 mit obtuse, with numerous rounded transverse ridges. 



Helix subcylindrica, Pultney's Dorset. 49 — C. truncatulum, Drap. Moll. 



40 On marsh plants. 



Length of the shell a quarter of an inch ; colour brown, mouth ovate, pe- 

 ristome thick, pillar cavity indistinct : summit as if truncated, ending sud- 

 denly in a small smooth button-like whorl. The animal, according to Dra- 

 parnaud, is white, transparent, with a long contractile snout : tentacula 

 short, little acuminated ; eyes above the retral base of the tentacula ; foot 

 short ; lid thin, semioval, with bent strise. Dr Pultney found his on " water 

 plants in rivers and ponds." Draparnaud states, that it is found on the shores 

 of the Mediterranean, on the borders of marshes, on the earth among plants, 

 and even burried in sand ; and expresses a suspicion that it may prove a ma- 

 rine shell. In 1 80G I found a specimen in the cavity of a dead Spatangus 

 purpureus from the Frith of Forth. This species is probably the " Bucci- 

 num exiguum rufum quinque orbium" of List. Conch. 22. f. 19. — Donovan, in 

 his Brit. Shells, t. lxxx, figures this species, by mistake, for Pupa muscorum. 



EXTINCT. 



Gen. HELECINA. — Peristome entire, with a callous pillar. 



1. H. compressa — " Spire flatfish, an elevated thread surrounding the up- 

 per part. Mouth a little angular above." — Sower. Min. Conch, t. x. three 

 middle figures In Lias limestone, Leicestershire. 



2. H. expansa — " Carinated ; above, depressed, conical, obscurely striated ; 

 beneath, ventricose; callus expanded." — Sower. Min. Conch, t. cclxxiii. f. 1-3. 

 — Blue Lias at Lyme. 



3. H. solarioides — " Subdiscoid, obtusely carinated ; whorls depressed a- 

 bove, convex beneath." — Sower. Min Conch, t. cclxxiii. f. 4 — In Lias. 



4. H. polita — Subdiscoid, polished ; spire elevated, acute ; volutions mark- 

 ed with an impressed band, depressed above, below ventricose ; callous, thin, 



expanded ; aperture nearly square — Sower. Min. Conch, t. cclxxxv At Co- 



predy, in marly sandstone of the Lower Oolite. 



Gen. XVII. CAROCOLLA. — Shell carinated, mouth trans- 

 verse, not reversed. 



54. C. lapicida. — Shell convex, transversely striated ; peris- 

 tome reflected, white. 



Cochlea pulla, sylvatica, spiris in aciem depressis, List. An. Ang. 127, 

 Conch, t. 69. f. 68 — Helix lap. Linn. Syst. i. 1241. Drap. Moll. iii. 

 Mont. Test. Brit. 435. — Woods and old walls, England. 



