356 CRETACEOUS PELECYPODA 



antice acutis, in medio latiuscule deplanaiis seu sub-rottindatis, postice marjis numerosis 

 ac mtproximatis ; area lalissima, anguluiini striata; margine cardinali recto, 

 lineali, multidentato. 



Height of shell : its length ... ... ... ... 074 



Thickness „ : „ ... ... ••• ■■• f'Sl 



Altlioiigli a rather elongated sliell, with a hroacl area, thi,s species appears to 

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

 mens the ribs are almost reduced to mere strise, 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, PI. XVII, Eig. 35. 



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



Scaph. testa elongata, compressitiscula, antice oblique sub-rotundata, postice 

 sub-truncata, radiatim costata ; umbonibus promiimlis, obtusis, apiproxi^natis ; area 

 ligamentali angustissima ; regioiie cardinali recta, (obsolete denticidataj. 



Height of sheU : its length ... ... ... ... 0-52 



Thickness „ : „ ... ... ... ... 0'31 



I have only seen Eorbes' 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. — ? Valudayur group. 



BARBATIA, Gray, 1810, (see p. 340). 



1. Bakbatia decora, StoUczka, PI. XVII, Fig. 38. 



Barb, testa elongata, compressiuscula, antice oblique sub-rot undata, postice 

 obtuse sub-carinata, pjaulo latiuscula, late modiceque oblique truncata ; superficie 

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

 incurvis, valde appi'oximatis ; area ligamentali angustissima. 



Height of shell : its length ... ... ... ... O'-IS 



Thickness „ : „ ... ... ... ... 028 



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

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



