356 CRETACEOUS PELECYPODA 



antice acutis, in medio latiuscule deplanatis sen sub-rotundatis^ postice magis numerosls 

 ac approximatis ; area latissima^ angulatim striata; margine cardinali recto, 

 lineali, multidentato. 



Height of shell : its length ... ... ... ... 0-74 



Thickness „ : „ ... ... ... ... 0*81 



Although- a rather elongated shell, with a broad area, this species appears to 

 be a true ScapJiarca with unequal and radiately ribbed valves. In young speci- 

 mens the ribs are almost reduced to mere striae, which fully accounts for their being 

 so indistinctly shown in d'Orbigny's figure; we have a small specimen, about 

 equal to that described by d'Orbigny, and this has the ribs perfectly flattened, 

 but possibly this may be due to the state of preservation, though the shell appears 

 to be quite perfect. 



Localities, — North-east of Serdamungalum and near Shillagoody, in coarse 

 sandstone ; apparently rare. 



Formation, — Arrialoor group. 



2. Anomalocardia [Scaphauca] Clellandi, Forbes, PL XYII, Pig. 35. 



1846. Area Clellandi, Forb., Trans. Geol. Soc, Lond., vii, p. 139, pi. xvi, fig. 4. 



ScapJi, testa elongata, compressiuscula, antice oblique sub-rotiindata, postice 

 sub-truncata, radiatim costata ; timbonibus prominulis, obtusis, approximatis ; area 

 ligamentali aiigustissima ; regione cardinali recta, (obsolete denticulataj , 



Height of sliell : its length ... ... ... ... 0*52 



Thickness „ : „ ... ... ... ... O'Sl 



I have only seen Porbes' original specimen of this shell; it is a cast, with 

 the valves apparently sub-equal, radiately ribbed, and with a very narrow ligamental 

 area ; there are only few very slight impressions of the hinge-teeth traceable. 

 It seems to be a very rare shell. 



Locality. — Pondicherry. 



Formation, — ? Yaludayur group. 



BAPBATIA, Gray, 1840, (see p. 340). 



1. Baebatia decoha, StoliczJm, PL XVII, Pig. 38. 



Barb, testa elongata, compressiuscnla, antice oblique sub-rotundata, postice 

 obtuse sub-carinata, paulo latiuscula, late modiceque oblique truncal a ; superficie 

 concentrice crasse lamellose costata et minute decussatim striata ; umhonibus latis, 

 incurvis, valde approximatis; area ligamentali angustissima. 



Height of shell : its length ... ... ... ... 0-43 



Thickness „ : „ ... ... ,,. ,,, o-28 



Only a single specimen of this beautifully ornamented species was found; 

 it is characterized by being much elongated and rather strongly compressed, with 



