

MAZATLAN BIVALVES 105 



tinidse. The genera also are by no means satisfactorily ascer- 

 tained ; the same shell having been described by Forbes and 

 Hanley as Kellia nitida and Lepton convexum ; v. Br. Moll. 

 vol. iv., app. p. 255. As the animals of the Mazatlan species 

 are entirely unknown, a systematic arrangement of them is 

 not attempted ; and they are simply grouped under genera 

 according to the preponderance of characters. 



GENCJS KELLIA, Turt. 



Kellia, Twrton Conch. Dyth. Brit. 1822, p. 56. 

 Erycina, Payr. non Lam. (sp.) 

 Chironia (Laperousii) Desk. Rev. Zool. 1839, p. 356. 

 Bornia, sp., Philippi, Enum. Moll. Sic. 1836, p. 13. 

 Tellimya, sp., Brown, III. Conch. Gr. Br. 



153. KELLIA SUBORBICTJLARIS, Mont. 



Mya suborbicularis, Mont. Test. Brit. pp. 39, 564, pi. 26, f. 6. 

 Tellina suborbicularis, Turt. Conch. Diet. p. 179. 

 Kellia suborbicularis, Turt. Dith. Brit. p. 56, pi. 11, f. 5, 6. 



Alder, Cat. North, fy Durh. Moll. p. 93. Forbes fy Hani. 



Br. Moll. vol. ii. p. 87, pi. 18, f. 9, 9a, 9b, pi. O, f. ^.Searles 



Wood, Crag. Moll. (Palgeont, Soc.) Part ii. p. 118, pi. 12, 



f. 8, a, 1). Clark Moll. Test. Mar. Brit. p. 89, 

 Petricola suborbicularis, Gray, Ann. Phil. 1825. 

 Erycina suborbicularis, Reel. Rev. Zool. 1844. 

 Tellimya suborbicularis, Brown, III. Conch. Gr. Br. ed. 2, 



p. 106, pi. 42, f. 14, 15. 

 + Tellimya tenuis, Brown, loc. cit. f. 12, 13. 

 ? + Tellimya lactea, Brown, loc. cit. f. 10, 11. (Kellia 1.) B. M. 



Cat. Br. Moll. pt. 7, p. 83, no. 2Loven, I. M. 44, 310. 

 Erycina Geoffroyii, Payr. Cors. 30, pi. 1, f. 3 5. 

 Amphidesma physoides, Lam. fide Sow..* 

 Bornia inflata, Phil. Moll. Sic. vol. i. p. 14, & vol. ii. p. 11. 



After often repeated and most careful examinations of many 

 hundred specimens, comparing them with each other and with 

 the very minute description in the Br. Moll, as well as with 

 every Atlantic specimen that has been accessible, I am unable 

 to give any specific characters by which the Mazatlan shells 



* A. physoides, Lam. Erycina ph. Desh. The description of this shell 

 (An. s. Vert. ed. Desh. vi. 130, no. \Q t ) will fit any similar species. "A. t. orbi- 

 culato-globosa, hyalina, vesiculari. Hab. au port du roi George. Peron." 



