1891.] MR. E. A. SMITH ON SHELLS FROM ADEN. 42/ 



subvalidus, centriilis ; pngina interna nitida, radiatim obsolete 

 striata ; sinus pallii profundus, supenie subanjulatus. 



Longit. \S\ millim., alt. 14, diain. 6. 



This species has oblique sculpture similar to that in T. rhomhnides, 

 Quoy and Gaimard. It is, however, not nearly so narrow as that 

 species, but agrees with it in dentition. Only the posterior slope is 

 free from oblique striae, but it has more distinct coicentric lines. 

 In certain lio;hts the whole surface exhibits t'anit or subobsolete 

 striation. When the valves are closed, the anterior dorsal slope 

 exhibits a lanceolate lunular depression. 



214. Tellina (Phylloda) foliacea, Linn. 



Hub. Red Sejv, Indian Ocean, Moluccas, Philippines : Aden 

 {Caramagnd). 



215. Tellina (Macoma) dubia, Deshayes. 



Tellina (/«6«a, Deshayes, Pioc. Zool. Soc. 1854, p. 371 ; Sowerby, 

 Conch. Icon. pi. xlvii. p. 279. 



Hub. ? 



Sowerby's figure does not represent the posterior end of this 

 species sufficiently truncate. 



216. Tellina (Metis) edentijla, Spengler. 



Hdb. Philippines, Ceylon ; China and Kurrachee (Brit. Mus.). 

 This si)ecies is T. angulala, Chemnitz, not of Linne. 



217. Semele chinensis. A, Adams. 



Hab. Indian Ocean, Mergui Archipelago, China. 



Amphidesma cordiformis (Reeve, Conch. Icon. fig. 30) is the same 

 as this species. It is uncertain whether he has correctly identified 

 that species of Chemnitz, who gives the West Indies as the locality 

 of his shell. 



218. Semele (Iacra) seychellarum (A. Adams). 

 Scrobicularia seychellarum, A. Ad. Proc. Zool. Soc. 185G, p. 53. 

 Hab. Seychelles. 



This interesting species, originally located in the genus Scrobicu- 

 laria, was subsequently placed in a subgenus of that group named 

 Iacra by H. & A. Adams. Fischer in his ' Manual ' considered it 

 a subgenus of Syndesmya or Abra. This location is, in my opinion, 

 correct, for the dentition of the hinge and the ligament agree in 

 detail with that group, which, however, I regard only as a subgenus 

 of Semele. 



219. DoNAX (Mach^erodonax) scalpellum. Gray. 

 Hab. Gulf of California. 



The above-named locality, given by Reeve (Conch. Icon. sp. 39), 

 has never been confirmed, and I think there is little doubt that it is 

 incorrect. The specimens from Aden agree in form, colour, sculpture, 

 and every other respect with that figured by Reeve. One example, 

 however, has the ground-colour yellowish instead of bluish white. 



