MAZATLAN BIVALVES 33 



Shell closely resembling T. puvpm-ea ; from Real Llejos, 

 Cuming. It differs fi-om the plate in Beech. Voy. iu having, 

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

 crowded with extremely close concentric stripe, decussated 

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

 become obsolete, in one valve only, on the ventral i)ortion. 

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

 valve ; on the other, with rather sharp raised ridges, carrying 

 on generalh* every other one of the concentric stria;. Epider^ 

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

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

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

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

 its flatness. Long.l'lS, lat.''2'\% alt. "Si. 



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

 L'pool 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. 



Hab. — Mazatlan : Col. Cuming. — ?? Do. in Spondylus washings, 

 L'pool Col. 



50. Tellina Dombei, ITanl. 



Proc. Zool. Soc. 1844, p. 144. — Hani, iu Soio. Thes. Conch. 

 p. 323.— C. B. Ad. Pan. Shells, p. 282, no. 4(54. 



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

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



Hab — Panama, in sandy mud, 12 fm. Cuming. — Panama, rare, 

 C. B. Ad. — Mazatlan, 2 specuncns, L'pool Col, 



Tablet 112 contains one specimen. 



