110 CRETACEOUS PELECYPODA 



11. Lulricola, Blainvillc, 1824<,* (see Carpenter in Journ.de Conch., 1865, 

 3 ser., vol. v, p. 133). Shell transversally clongately oval, cartilage-pit more 

 vertical than oblique, cardinal teeth lamellar, Lut. Chemnltzii, Desh., can be 

 considered as the type. H. and A. Adams refer to their sub-genus Capsa also a 

 few species, like Tell, lactmosa, Chem., sjiectabilis, Hanley, and some others which 

 must form a sub-genus in the Tellinidje ; they have a sub-internal ligament, but 

 not a cartilaiiTc. 



12. lacra, II. and A. Adams, 1S58. Shell sub- trigonal, somewhat attenuated 

 and produced posteriorly, sul)-pcllucid, surface of the valve divaricately sulcated, 

 cartilage-pit oblique, narrow ; one cardinal tooth in each valve in front of the 

 cartilage-pit ; lateral teeth close to the cartilage process, more prominent in the 

 right than in the left valve. 



n. and A. Adams in their "Genera" placed this form, the type of which 

 they call I. Scycliellamm, as a sub-genus of Scrohicularia, but A. Adams 

 (Ann. Mag. Nat. Hist., xiii, 186J-, p. 308,) characterizes the genus newly as 

 having lateral teeth ; thus the shells would prove to be more allied to Symlosmya. 

 A strict investigation has to be made whether lacra Seychellarimi does really 

 possess lateral teetli or not. If it does not possess them the name lacra must 

 stand for it, and la. Japonica of A. Adams must be separated as a distinct 

 genus; but if lacra Seychellarum is supplied with lateral teeth both must be 

 placed in the same genus. I mention this point particularly because I di-edged in 

 the Galle harbour three species, of which one is very numerous and has lateral 

 teeth. It is Syndosmya strigilloides of Vaillant and apparently closely allied to 

 I. Japonica of A.Adams; another different species also has lateral teeth, but a 

 third, of which I procured only one valve, has none. The question now arises, as I 

 said, regarding the lateral teeth of Seychellarnm, and in case this does possess 

 them, a ncAV genus must be proposed for the last named form -nathout lateral 

 teeth, and this will stand close to Scrohicularia. But unless we are certain on 

 this point, it is of no use increasing the bm*den of our nomenclature. When 

 the examination has been made, the change can be easily effected with the facts 

 before us. 



Dunker, in Mai. Blotter of 1861, vol. viii, p. 43, describes a Strigillina 

 lactea from the Red Sea. He places it close to Semele, so I suppose the form will 

 be identical with lacra, taking this genus in the amended form and supposing that 

 I. Seychellarum has lateral teeth. 



The following general are doubtful as belonging to the present family, but 

 from the scanty record we have of them, it appears that they would be placed 

 more correctly here than in some other divisions of the Tellisid^e. Carpenter 

 suggests that they may form a distinct sub-family. 



* As tlio name Capsa must be retained in Brnguier's sense for the type of Linux's Venus deflorata, 

 Carpentci's reconstruction of Blainville's name may be accepted. 



t Try on in his last catalogue of the Tellixid.TS refers (Edalina and Cooperella to the TELLIXIX.^. 



