34 MAZATLAN BIVALVES 



51. TELLINA FELIX, Hani. 



Proc. Zool. Soc. 1844, p. 11 Hani, in Sow. Thes. Conch, vol. i. 



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



Closely resembling a West Indian species in form and colour : 

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

 Hab. Sandy mud, 6 10 fm. Panama, Cnming. Panama, rare, 



C. B. Adams. Mazatlan : extremely rare, Upool Col. 



Tablet 113 contains 1 perfect valve. 



52. TELLINA STEAMINEA, Desk. 

 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 neighbouring species by the rounded very 

 faint concentric striae, which are clearly displayed by the 

 microscope near the umbo of the adult shell. 

 J&h Gulf of California, Col. Cuming. 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.jun. donaciformi, valde transversd, tenui, compressa, alba, 

 concentrice liratd ; liris acutis, subceguidistantibus, alternis, 

 medio scepe evanescentibus, antice rarioribus ; epidermide tenuis- 

 sima, hue et illuc liras radiatim decussante ; postice valde 

 products, subrotundatd ; antice angulatd, truncatd, brevissimd : 

 marginibus ventrali dorsalique fere par allelis ; car dine dcntibus 

 duobus quarum unus bifidus cardinalibus, laterali uno postico 

 brevi appropinquante, extante. 



Helated apparently to T. donaciformis, Desh. f fa&m Torres 

 Straits ; from which it is known at once by the strong projec- 

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

 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, which does not display the muscular impres- 

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

 Hab. Mazatlan : off Spondylus Lamarckii, IS pool Col. 



Tablet 116 contains the only valve found. 



