OF SOUTHEEN INDIA. 295 



32.— a d(Edala, Coq., Mon. Stage Aptien de FEspagne, 1865, p. 127, is apparently a 

 Ttychomya. 



33.— a truncata, Puscli, (Polens Pal., p. 77, pi. 8, fig. 3, and Eichwald Leth. ross., 

 10 livr., p. 638,) from white chalk.. 



34. — C. taurica, Eichwald, ibid., p. 638, pi. 24, fig. 6. 



35. — Crassatella horealis, Eich., ibid. p. 640, figured by Keyserling Petsehora-reise, pi. 17, 

 figs. 23-24, simply under the generic name of Crassatella, is supposed by Eichwald to be more 

 probably a neocomien than a Jurassic species ; but the form of the sbell does not agree with a 

 Crassatella; it may rather be a species of Baroda (sub-fam. tapesin^ J , or perhaps some form 

 of the sub-family GARiNyE (p. 113) or pharelliNjE (p. 36). 



36-40. — C. pusilla, TemuJclensis, Baudeti, Picteti, and Desvotixi are described by Coquand in 

 his Paleont. de la Prov. Constantino, (Algeria). 



41-52. — C. Alahamensis, cuneata, Belawarensis, Evansii, lintea, lineata, MonmoutJienns , parvnla, 

 pteropsis, suhplana, transversa, and vadosa are recorded by Meek in Check-list of cretaceous fossils 

 of North America, (Smiths. Misc. Coll., No. 177, 1864, p. 11). 



53-57. — C. grandis, compacta, Uvasana are noticed from California by Gabb (Pal. Calif., ii, 

 p. 244). In addition to these I may mention from Conrad''s lower eocene (? cretaceous) beds 

 C. capricranium and palmula (Smiths. Misc. Coll., No. 200, 1866, p. 5). 



58-59. — C.perlata ^ndiplanata of Conrad., (Am. Journ. Conch., ii, p. 104,) first noted from 

 tertiary rocks are subsequently (Am. Journ. Conch., iii, p. 270,) stated to be cretaceous. 



60. — C. prora, Con., Am. Journ. Conch., v, p. 43, is described from Crosswicks, New Jersey. 



61. — Crassatella per plana, f 8camhula, id., Con.), ibidem, p. 48, is noted from Haddonfield. 



62-63.— (7. Bothil, Eraas, and C. Syriaca, Con., (Wiirt. Nat. Jahreshefte, xxiii, p. 234,) are 

 from Palsestine. 



64. — C. Zittelliana, n. sp., and C. macrodonta, Sow., occur in the uppermost beds of our South 

 Indian cretaceous deposits. 



CEASSATELLA, Lam,, 1799, (see p. 293). 

 1. Crassatella macrodonta, Sow., sp., PI. V, Pigs. 12-14. 



1832. Astarte macrodonta^ Sow., Trans., Geol. Soc, London, iii, p. 417, pi. 38, fig. 3. 



1865. Crassatella idem, Zittel, Denksch. Akad., Wien, xxiv, pi. ii, p. 150, — cum synonimis. 



Cr, testa elongato-trigonata, incequilateraU, antice breviter rotundata, postice 

 longiore et oblique truncata, margine subumbonali leviter insinuato, postico declivi, 

 marg, inferiore postice flexuose curvato instructa, moderate inflata, carina obtusa ab 

 unibonibus ad marginem postero-inferiorem maxime productum decurrente ; lunula 

 areaque profundis, prima breviore quam altera sed latiore ; superficie in specimini- 

 bus junior ibus semper concentrice costulata, in adultis aut cequaliter crasse costulata, — 

 costuUs in declimtate postica obsoletis fvar. sulcifera auctore Zittel), — aut minute 

 striata ; cardine dentibus duobus cardinalibus in utraque valva et fossa cartilaginigera 

 profunda instructo, dentibus anterioribus multo fortioribus quam posterioribus, omninis 

 compressis ; dentibus lateralibus anticis parvis, dente postico laterali in valva sinistra 

 obtuso, elongato, in v, dextra fere obsoleto ; margine interno denticulato. 



Length of shell : its height ... ... ... 0-84 - O'QO 



Thickness „ : „ ... ... ... 0*60 - 0*65 



The persistency with which the two forms, one strongly concentrically sul- 

 cated and the other only finely striated, occur together is very remarkable ; passages 



4< c 



