MAZATLAN BIVALVES 



39. ?SOLECUETUS , sp. ind. 



Tablet 91 contains a fragment very flat, white, thin* with 

 irregular very fine striae, shewing within as well as without, 

 Hal). Mazatlan : in Spondylus washings ; L'pool Col. 



FAMILY TELLINHLE. 



GTENUS SEMELE, jSckum. 

 Syn. Amphidesma, Lam. 



10, SEMELE PROXIMA, C. B. Ad. 



Amphidesma proximum, C. B. Ad. Pan. Shells, p. 289, no. 487. 



Amphidesma proxima, (sc. -urn) Eve. Condi. Ic. Amph. pi. 3, 

 f.20. 



So much does this species vary in outline, and so closely do 

 some forms approximate to S. elliptica, that it is still an open 

 question whether C. B. Adams did right in separating it. The 

 colour is typically orange within, and "the pallial portion is 

 punctured. 



Hob. Panama, rare, C. B. Adams. Mazatlan ; common ; 

 L'pool Col. 



Smallest specimen measures long. '04, lat. '05, alt. '02, 

 Largest 2' 36, 2'5, 1'23, 



Transverse 2'03, 2'36, 117. 



Tablet 92 contains a pair and a valve, extremely young, which 

 probably belong to this species, though there are lateral teeth 

 slightly developed. 93, 5 specimens, normal state. 94, 5 speci- 

 mens more oblong. 95, 3 specimens very regularly rounded. 

 96, 3 specimens, very transverse. 97, 4 young specimens, with 

 very light epidermis. 98, 2 specimens shewing interior. 99, 2 

 pairs and a valve, deformed in growth, 



41. SEMELE PVENUSTA, A. Adams. 



Proc. Zool. Soc. 1853, p. 96. 



Amphidesma venusta [sc.-um] Eve., Conch. Ic. Amph. sp. 3. 



pi. 1, f. 3. 



Tablet 100 contains a young valve which agrees in the main 

 with this species. The concentric ridges are not developed, 



