64 MOLLUSCA. GASTEROPODA. 



C.fornicata, Lam. Shell oval, brown, with the margin entire, and 

 the summit obliquely recurved ; internal partition concave. 1 J 

 inch long. West Indian seas Lister, pi. 545, fig. 33. 



C. aculeata, Lam. Shell oval, fuscous, depressed, with longitudi- 

 nal prickly ribs, and the summit recurved and lateral. 8 or 9 

 lines long. Inhabits Indian seas. Favanne, pi. 4, fig. F, 2. 



Gen. 13. CALYPTR^A, Lam. Patella, Lin. 

 Animal unknown ; shell conical, with the summit vertical, im- 

 perforate, and pointed ; base orbicular ; cavity furnished with 

 a spiral lip or partition. 



C. equestris, Lam. Shell suborbicular, conical, thin, pellucid, white, 

 minutely striated longitudinally, and subtuberculated ; summit 

 curved ; internal appendage under the summit. ^ inch in dia- 

 meter. Inhabits Indian seas. Lister, pi. 546, fig. 38. 



C. iecium Sinense, Lam. Shell pyramidal, transversely foliaceous ; 

 summit central and erect. Indian seas. D'Argenv. pi. 2, fig. S. 



Gen. 14. PILEOPSIS, Lam. Patella, Lin. 

 Shell obliquely conical, bent forwards, with the summit almost 

 spiral ; aperture rounded, elliptical, with the anterior margin 

 shortest, the posterior larger and rounded; an elongated, arch- 

 ed, transverse, muscular impression under the posterior limb ; 

 animal with two conical tentacula, and the eyes at the base ; 

 branchiae disposed in a row under the anterior margin of the 

 cavity, near the neck. 



P. Ungarica, Lam. Shell conical, finely striated longitudinally, and 

 somewhat wrinkled transversely ; summit recurved and spiral ; 

 epidermis brownish ; inside whitish, with a rosy tinge. 1 to 2 

 inches in diameter. Inhabits European seas. B. Brown's II- 

 lust. pi. 37, fig. 19, 20. 



A number of fossil species of this genus have been found near Paris. 



Gen. 15. FISSURELLA, Lam. Patella, Lin. 

 Animal with the head truncated anteriorly ; two conical tenta- 

 cula, with the eyes at the exterior base ; mouth terminal, 

 simple, without jaws ; two pectinated branchiae projecting 

 from the cavity ; mantle large, projecting beyond the shell ; 

 shell concave above, perforated at the summit, without spire ; 

 opening oblong or oval. 



F. picta, Lam. Shell ovate, with concentric elevated belts, and al- 

 ternately white and violet longitudinal rays ; perforation oblong. 

 3 inches long. Straits of Magellan. D'Argenv. pi. 2, fig. E. 



F. Grceca, Lam. Shell ovate, cancellated, with unequal longitudi- 

 nal narrow ribs, and transverse striae ; margin crenated within ; 

 colour dull brown, greenish or yellowish white, with one or two 

 brown concentric rings. 15 lines in longitudinal diameter. In- 

 habits Mediterranean sea. B Brown's Illust. pi. 36, fig. 10, 11. 



