OP SOUTHERN INDIA. 1G3 



78. — V. Rochehruui (Tapes id., Zitlel), I wmild rather susiioci iu he a small Calllda than a 

 memher of the TAPESIN.e. 



79. — Bonacilla compressa, d'Orh., (Pal. fraii9., iii, pi. .37G, figs. 3-i), heIoiij,'s apparently U> 

 Baroda of the tapesix^. 



80. — Psammobia ill/par, Zittel, (Denkseh. Akad., Wicn, xxiv, pt. ii, p. 120,) is a species of 

 the sub-genus Icanotia, and the species may provisionally stand as Baroda [^IcanoLict] impar, 

 Zittel, sp., for it is not very improbable that Matlieron's Solen elegans is also an IcunoUa, though 

 quite distinct as species. 



81. — Psammobia discrepaiis, Duj., (Mem. Soc. Geol., France, ii, p. 223, pi. ii, fig. 2). The 

 figure of the fragmentary shell leaves one in doubt whether the species may not bo one of the 

 PSAMMOBiiN^E, but that of the east is more indicative of a species of Icanotia. If d'Orbigny's 

 figure (Pal. fran9., iii, pi. 381, figs, 3-5,) is correct, there can bo little doubt about this. 



82. — Solen injlexus, Duj., (ilj. p. 202, pi. ii, fig. !•,) is also more likely a Baroda than anything 

 else. In such cases as this, where imperfect casts arc considered to be suflficiently characteristic 

 of a species, there is, however, a great difficulty to distinguish between the TaPESIN.e and some 



PEARELUN^ of the SOLENID.e. 



83. — Capsa Arnaudi, H. Coq., (Bull. Soc. Geol., France, vol. xvi, p. 1000). The description 

 indicates a species of Icanotia. 



84-85. — Psamm. Suessi, Zitt., (Denkseh. Akad., Wien, xxlv, pt. ii, p. 121, &c.), and TeUina 

 Venei, d'Arch. (Bull. Soc. Geol., France, 2ud ser., vol. xi, pi. ii, figs. 1-2,) are typical species 

 of Baroda. 



86. — Circe f/wcas. Math., sp. (Zittel in Denkseh. Akad., Wien, xxiv, pt. ii, p. 128, pi. iii, 

 fig. 7), is a Cijprimeria. Pictet and Campiche (Pal. Suisse, 3°*'^ ser., 3™ pt., p. 197,) discuss the 

 question as to the discrepancy in the existing accounts of this sjjccies at length, and very properly. 

 There can be little doubt that the species described and figured by Matheron (Cat., p. 144, pi. 13, 

 fig. 12,) is the true discus of Zittel, for he compared the Gosau specimens with one sent to him 

 by Matheron himself. I have myself exposed the pallial line on three of the Gosau specimens, 

 and I can testify to the correctness of ZittePs drawing (in fig. le). I would not call the pallial 

 impression an entire one ; it is distinctly insinuated, though the sinus is very shallow and rounded, 

 at least as far as the impressions on the casts go ; we do not find it sometimes stronger in species of 

 Cijtherea or Venus. Variations of that kind, as I had already often mentioned, are by no means 

 rare. It is more likely that d'Orbiguy was mistaken in his figure (4, pi. 379), for in any of the 

 species of Cyprimeria that I have seen, I have not observed such a broadly rounded sinus ; still 

 there is no reason that the form could not occur, and if this shape of the sinus be confirmed, the 

 form must be considered to be a ditferent species under d'Orbigny's name Gyp. unmismaUs. 



87. — Arcopagia Cenomaniensis, d^Orb., (Prod., ii, p. 158,) said to be allied to Arc. (Ci/primeria) 

 discus of the same author. 



88-89. — Arcopagia rotundata, d''Orb., (Pal. fran9., pi. 379, figs. 6-7,) and Circe conceiitricii, 

 Zittel, (loc. cit., ji. 130, pi. 4, fig. 1,) are Cyprimeria. 



90.* — Circe duLiosa, Zittel, (ibid. fig. 2). I think Zittel is correct in referring this species to 

 the same genus as the last named species. I succeeded in breaking up a specimen partially devoid 

 of shell. The left valve distinctly shows two thin diverging teeth under the umbo and a third 

 posterior long one, being very thin ; in the right valve I can also notice two divei-ging teeth, but 

 they are not very distinct ; there arc no other teeth uuder the lunula, so the species is not a Circe. 

 It, on the whole, somewhat resembles Venns nuciformis, Miill., and is, therefore, still more 

 likely a 3Iercenaria. The beaks are incurved, but the edges of the lunula are, as in Cyprimeriin, 

 straight, not excavated. 



* I .sli:ill coutiiiiie tlio iniuibcrs, tliougli tlicy iiuist imt as yol be acoriilcj as iiuliciiting so many fVistiuot speoicii. 



