MOLLUSCA. 633 



Pectunculus glt/rimeris— The Delicious Pectunculus. Plate Ixxviii. fig. 

 8. Suborbicular, umbones produced ; finely striated, transversely and longi. 

 tudinally ; covered with a villous skin, under which, it is marked with red- 

 dish chestnut spots or bands; inside white, and the margin crenulated. 

 From two to three inches long. Inhabits the British aud Mediterranean 

 Be as. 



Area NocE.—'Sonh's Ark. Plate Ixxviil. fig. 9. Oblong, striated trans- 

 versely, and longitudinally ribbed ; umbones remote, and encurvated; mar- 

 gin entire and gaping; cream- white with divergent and zigzag chestnut 

 stripes ; inside white. Two indies broad. Inhabits the American and Bri- 

 tish seas. 



Cucxdlo'a auricul!fera.—T\\e Eared Cucullaea. Plate IxxviiL fig. IQ. 

 Obliquely heart-shaped, ventricose, with decussated striae ; reddish-brown ; 

 hinge with two parallel ribs at each end ; white ^vithin and slightly tinged 

 with violet. Two and a half inches broad. Inhabits the Indian ocean. 



Isocardi Cor.— The Heart Isocardia. Plate Ixxviil. fig. 11. Globular, 

 and heart-shaped, slightly ^vTinkled longitudinally ; reddish chestnut, the 

 umbones paler and prominent ; inside white. Four inches long. Inhabits 

 the Mediterranean and British seas. 



Hiatella arctica.—The Arctic Hiatella. Plate Ixxviii. 12. Transversely 

 oblong ; the apices truncated, with two divergent spiny ridges ; yellonnsh. 

 white with decussated striae ; inside pearlaceous. One half inch long, and 

 one inch broad. Inhabits the British seas. 



Cypricnrdia Guinaica.—T)xe Guinea Cypricardia. Plate Ixxviii. fig. 13. 

 Transversely oblong, oblique and angiilated, white, and covered with de- 

 cussated strise ; compressed before and the apex rounded ; yellowish-white. 

 Two inches long. Inhabits the coast of Guinea. 



Cardita sulcata.— The Farrowed Cardita. Plate Ixxviii. fig. 15. Subcor. 

 date, white, tessellated with brown ; having longitudinal, convex transverse- 

 ly striated ribs ; posterior depression heart-shaped. One inch long. Inha- 

 bits the Mediterranean. 



Carrfmm eda^e.— The Edible Cardium. Plate Ixxviii. fig. 14. With about 

 twenty-six depressed ribs, and transverse obsolete scales ; outside yellow, 

 ish white, and inside white ; beaks protuberant. One to one and a half 

 inches long. Inhabits the European seas. 



Venericardia imbricata. — The Imbricated Venericardia. Plate Ixxviii. 

 fig. 17. Suborbicular, having convex longitudinal ribs, covered with imbri- 

 cated, rough scales. One and a half inch long. Fossel at Grignon, 



Ortygia gallina.— The Hen Ortygia. Plate Ixxviii. fig. 19. Somewhat 

 heart-shaped with obtuse recurved concentric striae, and three or four ra- 

 iliated bands proceeding from the umbo to the margin, frequently with 

 zigzag markings throughout ; inside white. One inch long. Inhabits the 

 British seas. 



Venus Casina. — The Monticassina Venua. Plate Ixxviii. fig. 18. Subor- 

 bicular, with transversely, acute recurved ridges, crennlatpd on the hind 

 margin ; slightly channelled behind the depression. Two inches long. In- 

 habits the British seas. 



Cytherea Chione.— The Chione Cytherea. Plate Ixxviii. fig. 21. Somewhat 

 heart-shaped, strong; covered with a chestnut glossy epidermis, faintly 

 wrinkled, transversely, longitudinally rayed; with a cordiform depres 

 IV. 3 H 



