OF SOUTHERN INDIA. 407 



3. Inoceramus diveesus, Stoliczka, PL XXVII, Fig. 6. 



I. testa siib-quadraugula, ? incsquwalvi (valva dextra modice injlata, sinistra, ut 



videtur, convexiitsctUe deplanataj, valde incBquilaterali, umbonibus anticis, obtusatis, 



modice incurcis, margine anteriori et superio7'i sub-obtusis, postenori et inferiori leviter 



ciircatis ; siiperficie p)licis conceiitricis, margines versus sub-obsoletis, costis radiantibus, 



fortioribus, undulatis et partim nodulosis intersectis, ornata. 



A very characteristic ornamental species of a sub-quadrangular form, inflated, 

 witli tlie riglit valve apparently a little more convex, beaks almost quite anterior 

 slightly incurved. Of the left valve only a marginal portion has been seen, which 

 is distinctly flatter than the corresponding part of the other valve, indicating the 

 inequality in the form of both. Whether the same applies to the size of the valves 

 has not been observed. Both are only known from cast specimens, which show a 

 rather coarse concentric plication, the plicae becoming less distinct toward the 

 margins, being here intersected by stronger, partially nodulous, radiating ribs. 

 Portions of the shell preserved indicated that it was of moderate thickness, and 

 of the usual fibrous structure. 



Locality. — Anapaudy, in a brownish sandstone ; apparently rare. 



Formation . — Trichinopoly group. 



4. Inoceramus Geinitzianus, Stoliczka, pi. XXVII, Figs. 4-5. 



I. testa sttb-quadrangulari, longiore quam alta, ad medium paululum dilatata, 

 sub-cBquivalm, injlata, antice phis minusve abrupte truncata, regione Iwmlari depla- 

 nata, umbonibus acutis, fere rectiiiscide incurvis, anticis ; margine superiore recto, 

 postice moderate extenso, modice incrassato, margine posterioi'e supra paulo insinuato 

 infra convexo, margine inferiore convexiusculo ; superjicie plicis crassis sub-cequalibus 

 et siriis confertis concentriois notata. 



This species is closely allied to I. striatus, Mant., but it is much less inequi- 

 valve, the right valve being apparently only very little, if at all, smaller than 

 the left one ; the ribs and striae also appear to be posteriorly somewhat more 

 distinctly flexuous than, in the European striatus. Geinitz (Kieslingswalda, pi. iii, 

 fig. 12,) figured a right valve of an Inoceramus (under the name of I. concentricus) 

 which most closely resembles our Indian fossil ; it has been perhaps wrongly 

 identified with I. latus, Mant., for it shows much more aflS.nities to striatus than to 

 latiis, and if it does not belong to the former species, it may very likely be identical 

 with the Indian one. The species attains a large size; some specimens from 

 Koloture measuring about 160 m. m. in. length and up to 130 in greatest height. 



Localities. — South-west of Coonum, Puravoy, Ootatoor, Kolakonuttom, Ana- 

 paudy, near Koloture, and Garudamungalum. At the last locality the rock is a 

 brownish grey sandstone with a large nimiber of small shells ; at the other localities 

 the specimens occur in a brownish or yellowish highly calcareous and earthy 

 sandstone. 



Formations, — Ootatoor and Trichinopoly groups. 



5 G 



