OP SOUTHERN INDIA. 357 



only a slight indication of the usual pedal and byssal gape of Barhatla ; the liga- 

 mental area is very narrow, the hinge line straight, but the hinge-teeth have not 

 been made visible, the valves being closed. 



Locality. — Ninnyoor, in a whitish sandy limestone. 



Formation. — Arrialoor group. 



2. Baebatia diatreta, StoUczka, PI. L, Fig. 9. 



Barb, testa elongate ovata, valde incequilateraU, modice wjlata, antice breviori, 

 angustata, infra conspicuiter insimiata ac hiaiiti, postice producta, multo latiore, 

 ad marginem oblique siib-rotiindata ; area mediocri, angitlatim striata; mnbonibus 

 approximatis, depressiusculis, sub-sulcatis ; superjicie radiatim striata, striis alteris 

 concentricis incrementi ad intervalla interriiptis. 



Height of shell : its length ... ... ... ... 0'56 



Thickness „ : „ ... ... ... ... 0'45 



A typical form of a Barbatia and closely allied to several recent species, 

 particularly some of the varieties of velata, with the anterior side of the shell 

 considerably narrow. The flattened slightly sulcated beaks and the posterior 

 broadly rounded shell distinguish this species, though the single specimen is not 

 in very good state of preservation. 



Locality. — South-east of Veraghoor, in a brownish finely oolitic rock. 



Formation. — Trichinopoly group. 



AUG A, Linne, 1799, (see p. 341). 



1. Aeca filistriata, StoUczka, PI. XVII, Pig. 37, PI. L, Pig. 6. 



A. testa elongata, injlata, antice levissime flexuose sub-truncata, infra profunde 

 insimiata, postice latiuscule et convexe sub-truncata, ab imibone sub-carinata, declivi- 

 tate costa longitudinali divisa ; supetfcie radiatim Jtliforme striata, striis lamellis 

 incremetiti crassiuscidis interriiptis ; area ligamentali longitudine testes fere cequante, 

 latissima, angulatim striato-sulcata, umbonibus distantibus. 



Approximate height of shell at the beaks : its length ... ... 0-4.5 



„ thickness „ : „ ... ... 042 



This is the only species of Area (as restricted) found in the South Indian 

 cretaceous rocks, and the single specimen is somewhat imperfect, but it sufficiently 

 exhibits the characters of the genus. The striation is very similar to that of the 

 last mentioned species of Barbatia, but the striae are more distinctly filiform, and 

 the lamellae of growth much more strongly developed. 



Locality. — North of Odium, in a brownish limestone ; very rare. 



Formation. — Ootatoor group. 



