OF SOUTHERN INDIA. 289 



GROTIilANIA, Speyer, 1860, (see p. 278). 

 1. Grotriania jugosa, Forbes, PI. X, Eigs. 12-14.. 



1846. Lticina jugosa, Forbes, Trans., Geol. Soc, Loud., vii, p. 142, pi. xvii, fig. 7. 



1847. „ ornatissima, d'Orbigny, Voy. d' Astrolabe, Paleout., pi. iv, fig.s. 27-28; — Luchia ;'»5'o«a, auctorum. 



Grot, testa orbiculato lentiforml, supe^'ficie concentrice crasse costulata et minu- 

 tissime striata, apicibus deplanatis et valde approximatis ; margine lunulari paululum 

 insinuato ; liumla et area prof undlsslme excavatis, earitmque inarglnlJjtis acute projici- 

 entibus ; cardlne dente antico cardinali in utraqne vulva sub-obsoleto, duobus p>ositicis 

 majoribus, quorum medio in v. dextra maxim-o, dente laterali postico in valca dextra, 

 antico in valva sinistra sub-ohsoletis instructo ; impressione mnscul. aiitica obliqua 

 obovata, postica paulo minore, fere circulari; margine interna minutissime denticulate 

 striata. 



Height of shell about equal to its length. 



Thickness of shell : its length ... ... ... ... 0'47 



The orbicular form, slightly but very regularly convex valves, with flattened 

 umbonal regions, the very deeply excavated lunula and area, the concentric lamellar 

 ribs, which are besides covered with very fine strife of growth, and the fine internal 

 crenulation of the margin are the most prominent characters of this interesting 

 species. It is a true Grotriania, that is, an Astarte with deeply excavated lunula 

 and area. 



Locality — Near Odium, in a ferruginous earthy limestone. 



Formation. — Ootatoor group. 



GOULD lA, Adams, 1851, (see p. 279). 

 1. GoTJLDiA PLANissiMA, Forbes, PI. X, Fig. 3. 



1846. Astarte planissima, Forbes, Trans., Geol. Soc, Lond., vii, p. 143, pi. xv, fig. 23. 



1847. „ calata, Miiller, Petref. Aach. Kreidef., p. 22, pi. ii, fig. 3. 



Gauld. testa sub-quadrangulari, campressiuscula, margine areali et lunulari ad 

 apicem angulum fere rectum formantihus, regione tunbonali deplanata, jiostice p>aulo 

 angnstiore qnam antice, et rotundate trimcata ; superficie costis paucis fQ-QJ crassis 

 concentricis tecta ; cardine in valvula sinistra duobus dentibus cardinalibus, crassi- 

 usculis et una postico elongata laterali, in val. dextra tribus cardinalibus, medio 

 maxima alteris sub-obsoletis, et una laterali antico longo instructo. 



Height of shell : its length ... ... ... O'OO 



Thickness of both valves : „ ... ... ... 0'57 



I have compared authentic specimens, received from Dr. Bosquet, of Miiller' s 

 Astarte ca?lata, and I can see no percejDtible difference between them and our 

 shell. The flattened umbones and the comparatively few but very strong con- 

 centric ribs characterize the species, and distinguish it apparently from Miinster's 



