or SOUTHERN INDIA, 347 



NUCINELLA, Wood, 1850, (see p. 831). 



1. NuciNELLA GLABRATA, StoUczka, PI. XVII, Fig. 21, aud PI. XLIX, Figs. 7-8. 



N. testa, minima, oblique ooata, tumidula, glabra et jiolita, ad marginem infe- 

 riorem rotundata, postice sub-truncata, umbouibus prominulis, obtnsis, termi- 

 nationibus marginis cardinalis vix conspicms. Cardo dentibus circiter 6-7, parvis, 

 ill serie noii interrupta et leviter curvata dispositis, iustrnctiis, dente laterali autico 

 crasso, remoto, in valva dextra simplici, in v. sinistra ditplici. 



Height of shell (see PI. XLIX, Fig. 7,) about equal to its length. 

 Thickness of shell equal to half the length. 



This is the first cretaceous species of Niicinella on record. It is closely allied 

 to the tertiary N. ovalis, aud only distinguished by a slightly narrower ovate form 

 and posteriorly less prominent hinge margin. The lateral tooth is in both valves 

 very distinct and remote from the cardinals, as in the eocene miliaris ; it is single 

 in the right and double in the left valve ; the cardinal teeth are about seven in 

 number, small and tuberculiform. 



Locality. — Moraviatoor, in dark earthy limestone ; apparently rare. 



Formation. — Ootatoor group. 



AXTN^A, Toll, 1791, (see p. 331). 



1. AxiNJiiA STJBPLANATA, StoUczka, PI. XVII, Figs. 28-30, and PL XLIX, Fig. 10. 



Ax. testa latiuscule ovata, fere ■cequilaterali, antice xmiforme convexa, postice 

 ad medium sub-angulata,* vix loiigiore, umbonibus acutis, tumescentibus instructa, 

 ad margines compressiiiscula, sub-lcevigata, suleis incrementi nonnullis profimdis prope 

 7narginem distinctioribus et striis radiantibus sub-obsoletis tecta ; area ligamentali 

 2Jarva, angulatim striata, valde declivi; cardo dentibus 9-11 in utroqtie latere 

 descendentibus et in medio nonnullis minoribus ohliquis instructus ; margine 

 interno crasse denticulato. 



Height of shell : its length ... ... ... 090 - 0-96 



Thickness „ : „ ... ... ... 0-35-040 



The form of this species slightly varies, sometimes it is nearly orbicular 

 and strongly compressed (fig. 29), or it is somewhat more elongated and inflated 

 (fig. 28), but the valves are always conspicuously flattened towards the margins, 

 while the beaks are tumescent and prominent; the surface is in well preserved 

 specimens almost smooth, but when slightly worn off, faint, radiating, and concen- 

 tric strise appear ; besides this there are near the periphery generally a few deeper 

 sulci to be observed. The ligamental area is small and very rapidly descending ; 

 the hinge-teeth numerous ; the inner margin strongly denticulated, except close 

 to the hinge-teeth ; the upper half of the posterior margin is sub-truncated in 



* Figs. 28 and 30 should be posteriorly near the middle slightly subangular, the margin above the angle being 

 rather straight, that below it convex. 



4 Q 



