OP SOUTHERN INDIA. 435 



quotes Nils son's original figure of that species, it is perhaps true virgahis. The 

 form described as virgatus by Eoemer from Texas (Kreidebild., p. 66,) does not 

 exhibit any appreciable difference from Gurvatm^ but was called Texanus by Gabb. 



7. Pecten (Syncyclgnema) oboyatus, Stoliczka, PL XXXII, Pigs. 6—9. 

 P. [_Sync.'] testa ovata^ apice acutata, cequivalvi, valvis pcmlulum convexkisculis^ 

 aut sub-lcemgatis, aut Goncentrice lamellose striatis, awriculis parvis, cequalibiis^ 

 later aliter valcle declivibus. 



This species is somewhat allied to Amitsmm memhranaceum, Nilss., and also to 

 Fseudam, laminosum,^ Mant., but differs from both by the comparatively smaller 

 size of the ears, which are equal and very oblique at the lateral margins. 



In well preserved specimens the surface is marked with concentric lamellar 

 equidistant striae, exactly as in laminosiim, but these striae are very easily worn off, 

 and in such specimens the surface becomes nearly quite smooth. The upper 

 lateral margins of the shell meet at the beak with an angle of 98°. 



Localities, — Ootatoor, Moraviatoor, north and north-east of Odium, south of 

 Puravoy, &c., in brownish earthy limestone. 



Formation, — ^Ootatoor group. 



8. Pecten [Syncyclonema] Sivaicus, Stoliczka, PL XLII, Pig. 5. 

 P. [^Syncl testa orhiculate ovata, parum convexa, tenui, IcEvigata, polita, apice 

 hreviter acutata, auriculis suh-cequalibus, postica oblique desinente, antica convexe 

 truncata, ad basin paululum insinuata. 



Easily distinguished from the last species, which it closely resembles in form, 

 by the different shape of the ears, the anterior being convexly truncate and 

 slightly insinuated at the base. 



Locality, — North of Odium, in brownish earthy limestone; apparently very 

 rare. 



Formation, — Ootatoor group. 



9. Pectek [Pseudamusium] Gauudanus, Stoliczha, PL XXXII, Pig. 4. 



P. {Fseitdam.~] testa sub-orbiculari, antice pernio latiore qtiam postice ; valvis 

 complanatis medio et ad apicem parum convexis, tenuissimis, striis incrementi 

 subtilissimis notatis ; auriculis magnis, fere cBqualihus, antica convexe trimcata et ad 

 basin paulo emarginata. 



This species differs from the last by the more orhiculate shape and somewhat 

 smaller convexity of the valves ; the ears are of similar form, but comparatively 

 still larger. The shell is very thin and only marked with very fine, concentric 

 striae of growth. 



Localities, — ^^^i of Anapaudy and near Veraghoor. 



Formation, — Trichinopoly group. 



* This is considered by Morris as identical with Ptcten orbicularis. 



