OF SOUTIIEEN INDIA. 73 



2Sa.—T. Picteti, Favre, (Deseript. d. M. foss. de Lemberg-, Gmeve, 1SG9, p. lOG, pi. 12, 

 fig. 2,) is probably a Corimyn. 



%'d.— Th. aqualis, Eifliwald (Leth. Ross., livr. xi, 1807, p. 736), said to be a neocomien species, 

 appears to be a true Thracia. 



'6i).—Tk. Frearseana, D'Orb., (ibid. p. 738) is a Curimya ; it is stated to occur in the neocomien 

 beds at Chorosehowo with Th. elovgaia 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 : Lyonsia 

 meniscus, Eich., (doubtfully neocomien), and Zj/o?m. Alduini, Fisch.; both evidently are Gresslyee, 

 and most likely Jurassic. 



31-32. — Periploma Ferneuilli and P. Lorieri of Coquand (Monog. etage Aptien de TEspao-ne, 

 1865, p. 99, &c.) are both Corimya. 



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

 M-^9.—Th-acia ffracilis ( ? ), occiJeiiiaiis, /'Proud, subfortuosa ( ? ) suhiruncata, and Periploma 

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

 1864. 



40.—Anai. Columbiana, d'Orb., (Pale'ont. Voy. Am. merid., pi. IS, figs. 16-17,) is very likely 

 an aberrant form of Corimya or -Anatina ; 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. corbulopsis, 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. 



^A:.—Ceromya neocomiensis , Kg., (Etud. cret. Myae, p. 36, pi. viii f, figs. 1-10), is atypical 

 Geromya, and Agassiz (ibid. p. 35, &c.) also described a Ceromya crassicorms ; the figure o-iven loc. 

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

 however, Pictet and Roux 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 Caranlonensis and cryptoceras 

 are both Ceromya, 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 hoc. Washita, Marcou, Isoc. gaultina, 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., (fitage Aptien de I'Espagne, 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 subsinuata 

 occurs in the South Indian cretaceous deposits. 



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

 like in Plectomya, but do not apparently differ 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. subsinuosa, 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. 



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