G36 MOLLUSC A. 



23. Transversely oblong; blackish-brown ; longitudinally ribbed, with 

 imbricated, projecting foliations ; inside white. Inhabits the Mediterranean 

 sea. 



UngvMna transversa.— The Transverse Ungulina. Plate Ixxix. tig. 22. 

 Transversely round ; rugose, of a yellowish-brovvn colour. 



Erycina striata.— The Striated Erycina. Plate Ixxix. fig. 21. Yellowish- 

 green, with strong transverse strise. One inch long. Inhabits the Indian 

 ocean. 



Crassatella Kingicola.— The King's Island Crassatella. Plate Ixxx. fig. 

 I. Ovate, orbicular; yellowish-white; with obsolete rays ; very minutely 

 striated transversely ; the umbones somewhat plicated. Two inches long 

 Inhabits the sea at King's Island, New Holland. 



Ligula prcetenuis.— The Very Thin Ligula. Plate Ixxx. fig. 2. Oval, 

 flat, thin, brittle; a little gaping; valves with a single, spoon-like tooth in 

 each, projecting horizontally inwards ; white, with a few concentric stri*. 

 One inch broad. Inhabits the British seas. 



Mactra truncata.— The (Truncated Mactra. Plate Ixxx. fig. 3. Strong, 

 opaque, white ; truncated on both sides ; with a few concentric wrinkles. 

 One inch and a half long. Inhabits the British coasts. 



Lutraria elliptica.— The Oval Lutraria. Plate Ixxx. fig. 4. Oblong-oval, 

 nearly smooth, having a few concentric, nearly obsolete wrinkles ; and some 

 diagonal striaj at the ends of the valves ; of a fine yellow, or greenish.brown ; 

 inside white. Five inches broad. Inhabits the seas of Europe. 



Anatina declivis.— The Sloping Anatina. Plate Ixxx. fig. 5. Oval, thin, 

 brittle, a little gaping near the end, where it is truncated, slightly wrinkled 

 concentrically ; yellow sand-colour. Two inches broad. Inhabits the Bri- 

 tish seas. 



Mya truncata.— The Truncated Mya. Plate Ixxx. fig. 6. Suboval, trun- 

 rated, and gaping greatly at the smaller end; much rounded at the other ; 

 covered with a yellowish.brown epidermis; wrinkled transversely; inside 

 white. Three inches broad. Inhabits the British coasts. 



Glycimeris siliqua.— The Pod Glycimeris. Plate Ixxx. fig. 7. Transverse- 

 ly oblong ; covered with a black epidermis ; umbones decorticated ; Internal 

 disc of the valves white, callous, and thick. Two inches and a half broad. 

 Inhabits the North seas. 



Galeomma Turtoni.—Twciori's Galeomma. Plate Ixxvii. fig. 8. Tumid 

 in the middle, and gradually sloping to the sides; dull milk-white, covered 

 with short interrupted opaque lines ; beaks prominent and central. Breadth 

 nearly half an inch. luliabits the English Channel. 



Magdala striata.— The Striated Magdala. Plate Ixxx. fig. 12. Ovate- 

 oblong, white, with longitudinal striae and concentric wrinkles ; inside pearl- 

 aceous. One inch broad. Inhabits the British seas. 



Crenella elliptica.— The Oval Crenella. Plate Ixxx. fig. 13. Ovate, ven- 

 trieose ; with decussated striae ; greenish. yellow, and the margins crenu- 

 lated. One-eighth of an inch long. Inhabits the coasts of Zetland and Ar- 

 gyle. 



Spenia Binghami.—B'wgham's Spenia. Plate Ixxx. fig. 14. Upper valve 

 fiat, much smaller than the under, which is convex, and incurved at the ex. 

 tremity, and envelopes the smaller valve ; covered with a reddish.browu 

 epidermis; inside bluish-white. Half an inch broad. Inhabits the Devon, 

 shire coast. 



