87 



T. Limse fragili simillima, sed magis hiante ; margine ven- 

 trali magis expansa, et sub-angulata. 



Closely resembling Lima fragilis, but more gaping, and 

 having the ventral margin expanded and slightly angular. 

 Found at Lord Hood's Island, under coral rocks ; at Panama 

 in sandy mud ; at Guayaquil Bay ; at Guacomayo, under 

 stones, &c. by Mr. Cuming. 



16. L. aperta. (pi. xxii. f. 26, 27, 28, 29.) Ost. hians 

 Gmel. 3333. L. fragilis, Mont. Test. Supp. p. 62. L. tenera, 

 Turton. Zool. Journ. vol. 5. p. 362. pi. 13. f. 2. 



T. tenui, sub-compressa, oblique ovali vel elongata, ad 

 latera laevi, in medio minute striata, antice paululum, postice 

 late, hiante ; hiatu postico costa interna valida marginato ; 

 auriculis posticis acutis, area cardinali parva. 



More oval than L. fragilis, with the hinge end narrower in 

 proportion, and the striee much finer. Britain. 



17. L. dentata. (pi. xxii. f. 30. 31.) nobis. 



T. oblique elongata, tenui, sub-compressa, antice paululum, 

 postice late, hiante ; hiatu postico costa interna marginato ; 

 auriculis anticis parvis, obtusis, posticis acutis ; area cardinali 

 magna : costis 18, distantibus, scabris, ad marginem ventra- 

 lem dentatis. 



Obliquely elongated, thin, rather compressed, the anterior 

 side slightly, the posterior rather more widely gaping : a 

 slight internal rib forms the margin of the posterior hiatus ; 

 the posterior auricles are extremely sharp, with a notch under- 

 neath them; the hinge area is deep; ribs 18, distant, granu- 

 lated, their terminations producing a dentated ventral 

 margin. Collection of the Rev. F. J. Stainforth. 



18. L. Cumingii. (pi. xxii. f. 24, 25.) nobis. Zool. Proc. 

 T. tenui, parva, oblique elongata, subinflata, subquinque- 



laterali ad margines fere clausa : postice vix hiante ; margine 

 ventrali sub-quadrato, cardine brevi : auriculis brevibus, sub- 

 obtusis ; margine postico obtuse angulato ; costis 1 2 central- 

 ibus, sub-obsoletis, ad marginem dentatis ; umbonibus gib- 

 bosis. 



We have only seen one specimen of this very distinct 

 small shell, which differs from L. fragilis in being more 

 ventricose, and having the margin closed all round, in the 

 latter respect resembling L. Loscombi. 



Found in sandy mud, at a depth of 10 fathoms, by Mr. 

 Cuming at Bolinao, Isl. Luzon. 



