fi"28 MOLLUSCA. 



colour above, inside bluish. One-tliird of an inch loug. Inhabits the fresh 

 waters of Europe. 



Crepidula aculeata. — The Prickly Crepidiila. Plate Ixxvi. fig-. 16. Oval, 

 bnnin, with acute rough strite ; vertex recurved; inside with a cliamber, 

 and bluish or purple. One inch long:. Inhabits the American seas. 



Calyptrcea Sinense.— The Chinese Calyptraja. Plate Ixxvi. fig. 19. Orbi, 

 cular, subconic ; vertex ending in a small volution ; smooth, margin entire ; 

 cream. yellow ; very glossy within, and provided with a laminar plate. 

 I'hree-fourths of an inch in diameter. Inhabits the Chinese seas. 



Pileopsis Uyigarica.— The Hungarian Pjleopsis. Plate Ixxvi. fig. 31. Co. 

 nical, vertex slightly spiral ; longitudinally striated, and transversely wrin. 

 kled; covered with a fawn-coloured pilous epidermis j inside smooth, glos. 

 sy, white, or rose.coluur. Two inches in diameter. Inhabits the seas of 

 Europe. 



Fissurella Grceca.— The Greek Fissurella. Plate Ixxvi. fig. 20. Ovate- 

 oblong, convex ; the vertex -with an ovate perforation j with elevated can. 

 cellated stria", and the sections tuberculated ; opening oblong-ovate, white 

 or bluish ; outside yellowish-brown, sometimes clouded. Half an inch long. 

 Inhabits the European seas. 



Sipho radiatus. — The Rayed Sipho. Plate Ixxvi. fig. 21. Subconic, ver- 

 tex slightly recurved ; side with a square fissure near the top, from which 

 radiate strong striae ; with several concentric distant striae ; inside white ; 

 with a rhombic siphon, corresponding with the fissure, margin slightly cre- 

 nulated. One-fourth of an inch long. Inhabits the British seas. 



Emarginula fissura.— The Slit Eniarginula, Plate Ixxvi. fig. 17. Oval, 

 with reticulated striae, and ribs radiating from the vertex, which is obtuse 

 and slightly recurved; one margin with a fissiire, which extends nearly half 

 way to the vertex ; inside glossy, white. Three-eighths of an inch long. 

 Inhabits the Rritish seas. 



Parmophorus Australis. — The Australian Parmophorus. Plate Ixxvi. 

 fig. 22. Shell oblong, depressed ; vertex slightly recurved ; concentrically 

 striated; tlie posterior margin rounded, and the anterior truncated. Two 

 inches long. Inhabits the Australian coasts. 



Umbrella Indica.— The Indian Umbrella. Plate Ixxvi. fig. 24. Ovate, 

 elightly convex above ; the vertex towards the centre ; whitish, summit 

 yellow, longitudinally striated, and concentrically wrinkled; inside with 

 radiating stria;. Four inches in diameter. Inhabits the Indian seas. 



PleurobraHckus plumula. — The Plumed Pleurobranchus. Plate Ixxvi. 

 fig. \i. Ovate-oblong, depressed, pellucid, yellowish-white, concentrically 

 wrinkled, almost entirely open, rounded, and convoluted; the vertex with 

 a single turn. Half an inch long. Inhabits the Devonshire coast. 



Patella vulgata. — The Common Patella, or Limpet. Plate Ixxvi. fig. 15. 

 Oval, conic, or a little depressed ; outside green or brown, sometimes radiat- 

 ed with various colours ; with divergent stri.-e, and concentric wrinkles ; in- 

 side glossy, iridescent, having yellow, or fawn-coloured, and purple, 

 blue, or brown radiations. Two inches long. Inhabits the coasts of Europe. 

 Chiton fascicularis.— The Fasciculated Chiton. Plate Ixxvi. fig- 13. Eight 

 imbricated valves, nearly smooth, slightly carinated, and rounded at the 

 margins, with a thick tuft of hair between the junction of the valves, hav- 

 ing five on the top of the upper valve, and three on the base of the lower 

 one. Three-fourths of an inch long. Inhabits the British coasts. 



