OE SOUTHERN INDIA. 73 



2Sa. — T. Picteti, Favre, (Descript. d. M. foss. de Lemberg-, Geneve, 1869, p. 106, pi. 12, 

 fig. 2,) is probably a Corimya. 



29. — Tk. (Equalis, Eicliwald (Leth. Hoss., livr. xi, 1867, p. 736), said to be a neocomien species, 

 appears to be a true T/iracia. 



30. — Th. Frearseana, D^Orb., (ibid. p. 738) is a Corimya ; it is stated to occur in the neocomien 

 beds at Choroschovvo with Th, elongata of Romer. Eichwald (loc. cit., p. 728, etc.,) also quotes the 

 following from beds which he considers as neocomien, but which are more likely Jurassic : Lyoima 

 meniscus, Eich., (doubtfully neocomien), and Xyo?^^. Alduinij Fisch. ; both evidently are Gresslycej 

 and most likely Jurassic. 



31-32. — Perij)loma Verneuilli and P. Lorieri of Coquand (Monog. etage Aptien de FEspagne, 

 1865, p*. 99, &c.) are both Corimyce. 



33. — Lyonsia Peiniij Coq., is the only species known from Africa; it appears to be a Thracia. 



34-39. — Thracia gracilis ( ? ), occidentalism ? Proiiti, subtortuosa ( ^ ) suhiruncata, and Pei^iploma 

 applicata, are quoted from North America by Meek in his Check list, Smith. Misc. Coll., No. 177, 

 1864. 



40. — Anat. Columliana, d^Orb., (Paleont. Voy. Am. merid., pi. 18, figs. 16-17,) is very likely 

 an aberrant form of Corimya or Anaiina ; it has, besides one posterior, two other ribs, one across 

 the middle and one anteriorly to the beaks, but all the ribs have the same oblique direction. 



41. — Th, corhulojpsis, Gabb, is from Chili. 



42-43. — Corimya Oldhamiana and pertusa are the only two species representing this sub-family, 

 in the South Indian cretaceous deposits. 

 ANATININ^.. 



44. — Ceromya neocomiensis, Ag., (Etud. cret. Myse, p. 36, pi. viiif, figs. 1-10), is a typical 

 Geromyaj and Agassiz (ibid. p. 35, &c.) also described a Ceromya crassicornis ; the figure given loc. 

 cit. shows that the shell was like a Ceromya, but it does not give any positive proof of it. If, 

 however, Pictet and Eoux are correct in identifying their species (described Moll. Gres. vert., &c., 

 pi. 31, fig. 3, and Pal. Suisse, iv. Ser., Cyprina id.) with the above, it could scarcely be looked upon as a 

 Ceromya, because the shell of the specimen figured by the latter authors evidently was a thick one 

 with deep muscular impressions which could not be produced by a thin shell like that of Ceromya, 



It seems to me also probable that d''Orbigny''s two species, Isocardia Carantonensis and cryptoceras 

 are both Ceromyce, although d^Orbigny figures in the former some impressions of teeth, but these 

 may as well be derived from the undulated margin of a Ceromya, I could quote many other species, 

 such as Isoc, Washita, Marcou, Isoc, gaiiUina, described by Pictet and Campiche, and others, but 

 it is impossible to state anything positive about them. Even, in possession of some specimens 

 resembling the various casts figured, one is not certain whether they really are the species they are 

 stated to be, or something quite different. 



Ceromya recens, Coq., (Etage Aptien de FEspagne, p. 97, &c.), appears to me to be more 

 likely a Poromya than a Ceromya, as one of the best characters of the last genus, the incurved beaks, 

 are wanting. 



45. — One species of a true Ceromya which was described by Forbes as Isocardia suhsimiata 

 occurs in the South Indian cretaceous deposits. 



46-47. — Anatina Agassizii and dilatata both have an oblique internal rib posterior to the beaks, 

 like in Plectomya, but do not apparently difier essentially from Anatina, 



48. — Anat. carinata {Solen id., Matheron,) is too imperfect to admit a correct generic deter- 

 mination ; if Matheron^s figure represent a perfect specimen, the form of the shell would 

 be that of a Ceratisolen, 



49. — A. suhsinuosa, d''Orb., is a true Anatina, 



50. — A, solenoides (Pholad, id., Desh.). The figure does not give any proof that this is an 

 Anatina ; it may as well be a Pleuromya or Panopcea, 



T 



