100 On the Mollusca of the Arabian Sea^ &c. 



prominulis, margine dorsali utrinque fere sequali, leniter in 

 ventralem immergente ; ligamento interno, hujus valvae dente 

 cardinal! conspicuo, prolongate, illse duobus miuoribus approxi- 

 matis, dente laterali juxta cardinem abbreviato, pagina intus 

 translucida ; impressione palliali Integra. 

 Alt. 9, lat. 14, diam. 4-50 mm. 



Eal. Telegraph-cable, lat. 27° N., long. 52° E., at 

 40 fathoms, Persian Gulf. 



A very delicate moUusk, allied to S. rosea, Desh. It is 

 very translucent, shining, of the palest blush reflection, 

 oblong-ovate in form, equivalve and almost equilateral, and 

 quite smooth. The umbones are fairly prominent, close 

 together ; dorsal margin continuous, and almost equal 

 posteriorly and anteriorly, gently merging into the ventral 

 margin. Valves almost closed in repose; the ligament is 

 internal, the cardinal tooth prolonged and conspicuous, the 

 fellow valve possessing two smaller teeth ; the lateral tooth 

 is short, placed near the hinge ; the inner surface being 

 plain, transparent ; pallial impression entire. 



? (Edalina asiatica, sp. n. (PI. II. fig. 12.) 



(E. testa delicatula, nitida, alba, sequivalvi, inoequilaterali ; umboni- 

 bus prominulis, contiguis ; margine dorsali antice paulliim excavato, 

 deinde leniter rotundato ad marginem ventralem, latere postico 

 pauUum producto, oblongato ; supcrticie nitida, hie illic depressi- 

 uscula,concentricerudistriata; ligamento exteruo; dentibus dextrae 

 valvar tribus, sinistrse duobus cardinalibus, baud tamen bifidis, 

 lateralibus nullis ; pagina interna subpellucida ; liuea palliali 

 multum sinuosa. 



Alt. 12, lat. 16, diam. 8 mm. (sp, maj.). 



Hah. Muscat, at 10 fathoms ; also smaller examples at 

 Charbar, Mekran coast, at 3-7 fathoms. 



I feel some doubt as to the correct generic designation for 

 this shell. It is in shape externally much like (E Jalina 

 subdiaphana, Carp., from California, and Mr. Edgar Smith 

 suggested in consequence that it might be possibly located 

 with it. The teeth, very small and difficult to pronounce 

 upon, seem to agree to a great extent with those of the 

 western (Edalina, but I do not notice that any of them are 

 bifid. Carpenter separated Cooperella from (Edalina on 

 account of this peculiarity alone. If this species be an 

 (Edalina, it would tend to show greater affinity with the 

 Scrobicularinese than the Tellinidte, the texture of the shell, 

 though thin, being coarse, here and there irregularly de- 

 pressed and roughly concentrically striate. It is equivalve, 



