WORMS. TESTACEA. 66. Oftrea. 



257 



Kummaria. She// roundifh, fmooth, flightly eared and tranfverfelyflriate. 

 Inhabits the Mediterranean ; nze of a man's naif. 

 Shell polifhed, with undulate rufous marks: the ftrise very fine. 



^Nucleus. Shell obliquely ovate, fmoothifh, with a triangular hinge. 



Pennant Brit. Zool: iv. tub* $8. fig. 59. 



Barbut, tab, J, jig. 6. Gua.lt. test, t, 88. R. 



Chemn. conch. 7. ta£. 58. fig* 574. a, b. 



Inhabits European feas, and i-s fometimes found foffile : fize of 

 an hazel nut ; covered with ah olivaceous skin under which it 

 is white, within filvery : Jhell unequally triangular, with very 

 fine perpendicular ftrisb croffed by a few arched tranfverfe 

 ones : depreffion behind the beaks heart-fhaped* 



Khomboidea Shell entirely white, rhomboid heart- fhaped and ribbeu\, 

 the anterior and dorfal ribs knotty: beaks remote. 

 Lister, tab. 244. fig. 75. Gualf teft. t. 87, A. 

 Knorr Vergn. 4. tab. IA+ fig- 2. 



Chemn. conch. 7. tab. 56. Jig. 553, a, b. , 



Inhabits the Indian and American Ocean ; anterior (lope heart- 

 ihapedj pofterior one rhomboid* 



Murmoratd Shell eqtiilatera 1 , thin,, flattifh, with very fine decnfTate 

 ftrise : beaks approximate: hinge arched. 



Chemn* conch. 7. tub ^7 fig 563. , 



Inhabits the American Ocean.: white varied with yellowifh cha- 

 racters and fpois. i 



Angulofia. Shell ventricofe, with longitudinal ftriaT and lines,- and an- 

 gular on one fide : beaks approximate: hinge arched- 

 Lister conch, tab. 245. fig. 76. 

 Chemn. conch. 7. tab. 57. fig. 567. 



Inhabits fhores of Africa and American Octan: brown with a 

 few fpots. 



§capha. Shell oblong, very much deprcffcd, ftriate : beaks very 

 flightly prominent. 

 Inhabits Ceylon. Grononj. Zooph. tab. 18. f.fi 



66. OSTREA. Animal a Tethys : Jhell bi- 

 valve, generally with unequal valves and 

 flightly eared; hinge without teeth, but 

 fumifhed with an ovate hollow, and moft- 

 ly lateral tranfverfe grooves. Oyjler. 



..- VOL. IV. — Kk " Moft 



