OP SOUTHERN INDIA. Ill 



13. CEdaliiia, Carp., 18G6, (Proc. Calif. Acad. Nat. Sc. for 1866,— olim (Edalia, 

 Carp., 1861), and Jour, de Concli. 3"° ser., v, p. 134). Shell inflated, thin, equivalve, 

 equilateral, rounded ; scarcely gajiing, ligament external, cartilage sub-external ; 

 hinge with three cardinal teeth in one and two in the other valve ; all bifid ; no 

 lateral teeth, pallial sinus deep. The only type specimen was called OS. snh- 

 diaphana, of which the author states that it had accidentally been destroyed, but 

 the characteristic, as recorded, is believed to be correct. 



13a. Coojjerella, Carp., 186? is considered as a sub-genus of the former ; 

 it has the cartilage sub-internal, the ligament contiguous to it, the cardinal teeth 

 lamellar, simple, or one of them bifid. The sub-genus is probably closely allied to 

 3Ietis, 11. and A. Adams. 



14. Cycladella, Carp., 1865, [1861 ?] (Proc. Zool. Soc, p. 270). Shell resem- 

 bling (Edcdina in form, thin, umbones flattened ; ligament external, very thin ; i\\v 

 cardinal teeth lie in the curve of the hinge line, together with the laterals, 

 which are distant. Carpenter first suggested that the genus may belong to the 

 Kelliidje = Erycinid^ ; it is very unsatisfactorily characterized, and from the 

 great divergency of the cardinals it is likely to be placed more correctly in the 

 last named family than in the present one. 



List of cuetaceous species. 



There are, as I stated, from mesozoic rocks iio species known witk sufficient accuracy which 

 can be referred to the present family, but a few have been described from cretaceous deposits under 

 the names of some of the genera quoted above. I quite agree with Pictet that it would not be of 

 the least advantage to transfer those species to other genera, unless we know something more positive 

 of their characters ; I, therefore, append here a list of the cretaceous species (see Pictet Pal. Suisse, 

 i"* ser., 3™'= pt., p. 132, &c.), without much comment. 



1. — Amphidesma tenuistriahcm, Sow., is certainly not a Semele (ox Amphidesma) , nor is it likely 

 to be a Scrohimdaria, though more similar to it in form ; it may be a Thracia or a Tellina. 



2. — Zaviffiioii, r/iomboidalis, d'Orh., has originally been described by Leymerie as a P/iola- 

 domya, but it has more the appearance of a Paiiopaa, though it may also be shown to belong to Gari 

 ( ^ Psnmmobiaj , or one of the allied genera. 



3-6. — L. tnimita, Clementina, phaseolina, and sul-phaseolhia all appear to belong to the GARINjE ; 

 none of them has the characteristic form of Scrohicidaria, and the last two also resemble some 

 species of Lepion and Lasaa (Kellia). 



7-8. — L. Baijlei and Marcouti of Coquand have quite the external appearance of Thracia. 



Q.—AljmF formosa, Meek and Hayd., (Check List of eret. fossils; Smiths. Miscell. Coll., 

 No. 177, 1864). 



I may here mention a remarkable shell described (Mem. Soc. Geol., France, 2nd ser., ii, 

 p. 303, pi. xiv, fig. 6,) under the name of Cyprina incerta. The hinge of the left valve, which is 

 unfortunately not perfect, very strongly recalls that of a Cumingia, and so does also the form 

 of the shell. 



No species of this family occur in the cretaceous rocks of Southern India. 



