328 CRETACEOUS PELECYPODA 



NUCULA, Lamarck, 1799, (seep. 325). 



1. NucuLA TAMULiCA, StoUczka, PI. XYII, Eigs. 15-16. 



iV. testa ovata, valde incequilaterali, antice prodticta et siih-rotundata, postice 

 brevissima, oblique truncata, area applanata et longa instructa, compressiuseida^ 

 umbonibus obtusiusculis, approximatis, incurvis ; superficie concentrice minute 

 striata, sulcis nonnullis crassioribus ad marginem prcedita. 



Height of slieU : its length ... ... ... ... 0-73 



Thickness „ : „ ... ... ... ... 0*44 



This species belongs to the type of Deshayes' simplex, largely represented in 

 cretaceous rocks, but distinguished by its perfectly truncated posterior end and 

 flat, or along the middle almost excavated, area. It in this respect resembles 

 N. vox, Gieb., (tenera, Miill.,) from the Plsener beds at xlachen, but this species 

 is again distinguished by its radiating striation, which is always more or less 

 distinctly traceable. 



Localities. — Karapaudy, Comarapolliam, and Olapaudy, in a soft, whitish 

 and coarse sandstone. 



'Formation. — Arrialoor group. 



2. NucuLA INDEEINITA, Forbcs, PI. XVII, Eigs. 17-19. 



1846. Nucida indefinita, Forbes, Trans. Geol. Soc., Lond., vii, p. 148, (passim). 



N. testa ovata, sub-tumida, antice sub-rotundata, supra ac infra lente curvata, 

 postice brevissima, truncata,^ area mediocri, paulo excavata, hand distincter margi- 

 nata, umbonibus prominulis ; superficie concentrice minute striata; dentibus cardinis 

 anterioribus circiterl4i, crassis, impressione musculari posiica valde elongata, elevata, 

 margmali. 



Height of shell : its length ... ... ... ... 0*70 



Thickness „ : „ ... ... ... ... 0'50 



Eorbes proposed the name for a small cast of this species, very like the one 

 represented in fig. 18,t pi. xvii, which is from Cunlif fe's collection of Pondicherry 

 shells. It is a small species of a slightly more elongated and tumid form than 

 TamMlica, and has the area shorter, somewhat excavated, and indistinctly margined. 

 The posterior muscular impression is very elongated, marginal, and situated on a 

 thickened plate, forming a deep excavation on the cast. 



Localities.— VonAiohQYH^ J ^ in a bluish sandstone ; Ninnyoor, in a white sandy 

 limestone ; only one specimen from each locality was examined. 



Formation. — Arrialoor group. 



* In fig. 17 the inferior end below the lunula is a little too much produced, 

 t The beaks should be a little less prominent. 



