OF SOUTHERN INDIA. 85 



6. Pariojycea, "Menard, 1807.*' Shell nearly equivalve, large, oblong; hinge 

 with one strong tooth in each valve, pallial impression distinct, posteriorly deeply 

 insinuated, ligament supported by jn-ominent fulcra ; — burrowing in sand. 



It is really difficult to point out a prominent distinction between Saxicava and 

 Fanopcea, except that the latter generally are less inequilateral shells and of large 

 size ; and in proportion all the characters of Fanopcea, as pallial sinus, hiuge-teeth, 

 and the fulcra of the ligament, appear more distinctly marked ; their habitat is also 

 somewhat diiferent. 



H. and A. Adams, in their work on the recent genera of Mollusca, correctly 

 distinguish between Ghjcbneris and Fanopcea, but their application of the names 

 is based upon an incorrect interpretation and cannot, therefore, be retained. The 

 name Fanopcea was proposed by Menard for a tertiary species, which he calls 

 F. Faifjasi, but which has been proved to be identical with the recent P. c/li/cimet'is 

 of Born, or F. Aldrovandi, Men., and this species 11. and A. Adams refer to 

 Glycimeris, retaining the name FanopcBa for F. noroegica of Spengler. Thus the 

 name Funopcsa evidently cannot be used for the Norwegian species, but when wo 

 consider that Klein in his admirable "Tentanien" already refers to a Norwegian 

 species, which is probably the F. norcecjica of authors, and, further, that Deshayes 

 described that species (in the 2nd edit, of the Anim. s. vert.) under the generic 

 name of Ghjcbneris, I am not certain whether it were not preferable to retain that 

 generic name for it instead of creating a new one. For I believe there is sufficient 

 reason for placing the Norwegian species in a new genus, which connects the true 

 Fanopcece with Cyrtodaria, as I shall presently point out. 



7. Glijcimeris, Klein, 1753, (Tent, meth., p. 170, Fanopcea apud 11. and A. 

 Adams). Shell thick, nearly equilateral, hinge with one tooth in each valve, fitting 

 into a special cavity in the other valve; pallial line interrupted, moderately 

 insinuated, posterior muscular impression very elongated. 



In conformity with the few distinctions in the animals of Fanopcea and 

 Glycbneris (Gl. norvecjica), pointed out by H. and A. Adams, those of the shells 

 are, I think, deserving of a special notice. The shell of Gl. norvecjica is not only 



* To prevent further confusion I adopt here Menard's name Vanopcea. The recent species, which is the tj^ie 

 of the genus- P. Aldrovandi- has been, besides several others, well known to the oldest writers on conchology. 

 Klein in 1753 was the first who classed several of the species [the Norwegian one being evidently known to him] 

 under the generic denomination of Gli/cimeris. Klein gives a figui-e of one species and quotes next the Chama 

 glycimeris of Aldrovandi, but having applied the name Chama previously to another group of shells, Klein was 

 perfectly aware that a new generic name was required. Thus as far as the generic name is concerned, it was perfectly in 

 accordance with our present system of nomenclature. And, what notice did Klein's well selected name G!i/cimeris 

 receive from his successors ? Mr. Deshayes (in his 2ud edit, of the Paris fossils, p. 173,) tells us, that Lamarck, 

 struck with the peculiar characters of Bom's Mya glycimeris (= Chama glycimeris, Aldrov.,) proposed in 1799 a 

 new genus Glycimeris ! A few years back Lamarck applied the name Glycimeris to a perfectly different shell, which 

 Daudin called CyrWarja. And, again, after a few years, when Menard proposed his name Fanopcea, Taa.vaa.rck 

 dropped the name Glycimeris altogether. Whether Lamarck was, or was not, (which latter would be surprising) 

 acquainted with Klein's " Tentamen meth.," &c., it is clear that he was not the author of the genus Glycimeris, but this 

 name has been so unjustly treated and differently applied, that I do not for a moment see any benefit to science in intro- 

 ducing it again in a sense different from that generally adopted ; still when facta are to be given, it is just to former 

 labourers to give them in full. 



