34 MAZATLAN BIVALVES 



51. Tellina FELIX, Hani, 



Troc. Zool. Soc. 1844, p. 71. — Hani, in Sow. Thes. Condi, vol. i. 

 p 281 : pi. 58, f. 52.— C. B. Ad. Pan. Shells, p. 282. 



Closely resembliBg a West Indian species in form and colour : 

 Hani, compares it with T. donacina. Long. '43, lat. '7, alt. '2. 

 Hah. — Sandy mnd, 6 — 10 fm. Panama, Cuming.— Vawarasi, rare, 



C. B. Adams. — Mazatlan : extremely rare, L'pool Col. 



Tablet 113 contains 1 perfect valve. 



52. Tellina steaminea, DesJi. 



Proc. Zool. Soc. 1854, p. 363. 



One specimen was found, about two-thirds the size of the 

 Cumingian type which measures long. '33, lat. .48, alt. "17. 

 It is known from neighboiu'ing species by the rounded very 

 faint concentric strife, M'liich are clearly displayed by the 

 microscope near the umbo of the adult shell. 



^rtJ.— Gulf of California, Col. Cxuning. — Mazatlan, from Spon- 

 dylus washing : Upool Col. 



Tablet 114 contain the specimen. — 115 contains a minute 

 valve and fragment which probably belong to the same. 



53. Tellina uonacilla, n. s. 



T. t.jiin. donaciformi, valde transversd, tenui, eompressd, albd, 

 concentrice liratd ; liris acutis, suha^quidistantihus, alternis, 

 medio sa;pe evanescentihis, antice raHoribus ; epidermide tentiis- 

 simd, hue et illuc liras radiatim decussante ; postice valde 

 productd, siihrotundatd ; antice angnlatd, triincatd, hrevissimd : 

 marginibits ventrali dorsaliquefere parallclis ; cardine dcntibiis 

 duohus quanim ixnus bifidu^ cardinalibus, laterali tuw postico 

 hrevi appropinquante, extante. 



Eclated apparently to T. donaciformis, DesJi. from Torres 

 Straits ; from ■s\hich it is known at once by the strong projec- 

 ting lateral tooth. The shape is so remarkably like a Douax, 

 that I have only varied the termination from the British T. dona- 

 cina. The specimen is young, but well characterized except in 

 the inner surface, \^'hich does not display the muscular impres- 

 sions. Long. '08, lat. '14, alt. '05. 

 Hab. — Mazatlan : off Spondylus Lamarckii, L'pool Col. 



Tablet 116 contains the only valve found. 



