236 CONCH YLIA—l>iriJyjR^. 51. 



the support of the inhabitant ; being furnished with two tooth- 

 like processes, originating in the concave surface a little below 

 the hinge, extending inwards towards the margin, and variously 

 branched in various species. 



( ranitim. Terebratula testd ovutd semipellucidd, striis miiintis deciis- 

 satis, margine inferno intef/ern'mo. 

 Shell oval semitranspareut, with minute decussate stria;, and the 



inner margin very entire. 

 Anomia Cranium. Gmelin, Syst. p. 3347. 



Turtnn, Linn. Syst. iv. p. 287. 

 Dillwtjn, Descript. Catal. p. 294. 

 Turton, Conch. Diet. p. 5. 

 Terebratula Cranium. Montagu, in Linn. Trans, xi. p. 188, tab 



13, fig. 2, and B. 

 Dredged in Bressay, in the Shetland Islands, by Dr. Fleming. 



Shell an inch long, and hardly as mucli broad, convex, thin, 

 brittle, covered with a dull white skin, under which it is milk- 

 white and semitransparent ; the surface very finely reticulate or 

 shagreened. The internal projecting processes of the under or 

 shorter valve have a lateral ramification issuing from the base 

 on one side. 



Psittacea. Terebratula testd ovotd, striis longitudinalibtis, umbone prte- 

 longo curvo, margine sinuato integerrimo. 

 Shell oval, with longituilinal stria;, the beak much produced and 



curved, and the margin sinuous and very entire 

 Anomia Psittacea. Gmelin, Syst. p, 2348. 



