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. 

 If .— New Holland. 1 



aequilateral, inaequivalve, depressed, transversely plaited, smooth, 

 white, thin, polished, posteriorly rounded, anteriorly obliquely 

 truncated, somewhat compressed. 1 J. 



T. Phaseolina.* Kiener, 2.f 4. — Amphidesma P. Lam. 11. 

 — Mya Declivis. Mont. t. \. f. 2.— Wood. G. C. t. 18./. 3. 

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

 pressed, subeequilateral, inequivalve, white, subdiaphanous, finely 

 striated transversely, anteriorly shorter, angulated and truncated. 

 1 . . J. — Mediterranean, fyc. 



T. Similis. Couthouy 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 

 prominen t . 1 T ^ . — Brazil. 



T. Conradi. Couthouy, in Boston Jour, of N. H. 1839. t. 4. 

 f. 2. — T. Declivis. Conr. Am. Conch, t 9,f. 2. — Gould. Mas. p. 

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

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

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

 anterior slope obtusely keeled. 2 T 9 ^. — New England. 



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

 Wood. G. t. 18./. 1.— 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. JDesh. in Lam. 7. p* 83, — ICiener Thracia. 

 t. 2./ 3.—BI. t. 76. / 7. —Reeve, t. 35./. 3. Transversely ovate- 

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

 inequivalve, with irregular concentric striae, 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^ — Mediterranean. 



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. 



1 A Rupicola, Lam. 10, and A. Longirostris, Lam. 4, are Corbuke. 



