22 TESTACEOUS MOLLUSCA, 



rior end shortened, thin, smooth, white, transparent, with an ante- 

 rior rib : hinge with a narrow tooth which is united to the margin. 

 1#. — New Holland.^ 



eequilateral, insequivalve, depi'essed, transversely plaited, smooth, 

 white, thin, polished, posteriorly rounded, anteriorly obliquely 

 truncated, somewhat compressed. 1^. 



T. Phaseolina.* Kiener, 2. f. 4. — Amphidesma P. Lam. II. 

 — Mya Declivis. 3Iont. t. 1./. 2.— Wood. G. C. t. 18./. 3. 

 — AnatinaD. Turt. B. p. 47. Ovate-oblong, transverse, subde- 

 pressed, subsequilateral, inequivalve, white, subdiaphanous, finely 

 striated transversely, anteriorly shorter, angulated and truncated. 

 1 . . ^. — Blediterranean, ifc. 



T. SiMiLis. Covthouy in Boston Journ. 1839. p. 150. t. 4.f. 3. 

 Ovate-oblong, rough with minute granules, whitish, or ash colour, 

 semitransparent, inequilateral, anteriorly much longer attenuated, 

 truncated and subcompressed ; ventral margin little rounded, not at 

 all sinuated ; within white, not glossy, hinge with a subtriangular 

 hollow ; external ligament small and slightly prominent : beaks not 

 jirominen t . 1 J^-. — Brazil. 



T. CoNRADi. CoittJ)ouy, in Boston Jour, of N. H. 1839. t. 4. 

 f. 2.— T. Declivis. Com: Am. Conch, t 9./. 2.— Gould. Mas. p. 

 .50. Transversely ovate, ashy white, not shagreened, ventricose, 

 subssquilateral, fragile, little gaping, margin much sinuated, anteriorly 

 longer, subtruncated, posteriorly rounded, the beaks prominent, the 

 anterior slope obtusely keeled. 2-^^. — New England. 



T. CoNVEXA.* Couthouy in Bost. J. of N. H. 1839.— Mya C. 

 Wood. G. t. 18./. \.— W. t. 2./3.— Anatina C. Turt.B. t. 4. 

 / 1, 2. Obovate, posteriorly broad and rounded, anteriorly atte- 

 nuated, obliquely truncated, longer, with an obtuse ridge from the 

 protuberant umbones, to the ventral margin, which as well as the 

 anterior is sinuated ; very convex, thin, white under an ochreous 

 epidermis, with numerous striae of growth : inside yellowish. If ..2. 

 — England. 



T. CoRBULOiDES. Dcsli. in Lam. ?■ p- 83. — Kiener Thracia. 

 t. 2./; 3.—BL t. 76. f. 7. —Reeve, t. 35./. 3. Transversely ovate- 

 oblong, inequilateral, greyish-white, minutely shagreened, very 

 inequivalve, with irregular concentric strise, anterior side the longer 

 and attenuated, posteriorly obtusely rounded ; beaks large, ventral 

 margin with a prominent outward curve in the centre : within milk- 

 white, glossy. If. .2^ — 3Iediterranean. 



T. CuRTA. Conr. Jour. A. N. S. Phil. 7. p. 248. t. 19./. 8. 

 Suboval, inequilateral, posteriorly obtusely rounded and shorter, 

 anterior margin direct, subrectilinear, obtusely rectangular above 

 and below ; umbonal slope angulated. ^. — California. 



^ A Rapicola, Lam. 10, and A. Longirostris, Lam. 4, are Corbulse. 



