MAZATLAN BIVALVES 33 



Shell closely resembling T. purpurea ; from Real Llejos, 

 Owning. It differs from the plate in Beech. Yoy. in having, 

 the umbos less pointed and the teeth smaller. The surface is 

 crowded with extremely close concentric stride, decussated 

 (except on the fold area) by very fine radiating lines, which 

 become obsolete, in one valve only, on the ventral portion. 

 The fold area is nearly smooth (except lines of growth) on one 

 valve ; 011 the other, with rather sharp raised ridges, carry ing 

 on generally every other one of the concentric striae. Epideiv 

 mis light brown, very thin, coarser on the fold area. The 

 species much resembles (though smaller) T. priuceps, a valve 

 of which was sent from S. W. Mexico, (P. P C.) It gapes on 

 each side, and might almost pass for a Sanguinolaria, but for 

 its flatness. Long. I 'IS, lat. 2*12, alt. '31. 

 Sab. Mazatlan, 3 specimens (Mus. Archer, Darbishire, B. M.) 



Lpool Col. 



Tablet 110 contains one specimen. 



49. TELLINA ?? MAZATLANICA, Desk, 



T. Mazatlandica, Proc. Zool. Soc. 1854, p. 359, 



Tablet 111 contains a minute fragment which may be the 

 young of this species, though the characters of the hinge are 

 somewhat different. The Cumingian type measures long. '79, 

 lat. 1*3, alt. *32. 



Sab. Mazatlan ; Col. Cuming. ?? Do. in Spondylus washings, 

 L'pool Col. 



50. TELLINA DOMBEI, Hani. 



Proc. Zool. Soc. 1844, p. 144. Hani, in Sow. Tkes. Conch, 



p. 323. C. B. Ad. Pan. Shells, p. 282, no. 464. 



A plain, white, oblong shell, much swollen and produced 

 anteriorly. Long. I'l, lat. 1*45, alt. '5. 

 Hob Panama, in sandy mud, 12 fm. Cuming. Panama, rare, 



C. B. Ad. Mazatlan, 2 specimens, L'pool Col. 



Tablet 112 contains one specimen, 



