OP SOUTHEEN INDIA. 423 



with ten strong radiating ribs, the anterior and posterior portion of the shell being 

 smooth. 



Locality. — CuUpaudy, in a whitish coralline limestone. 



Formation, — Ootatoor group. 



LIME A, Bronn, 1831, (see p. 413). 

 1. LiMEA Oldhamiana, StoUczM, PL XXX, Pigs. 6-7, and PL XXXVI, Pig. 5. 



L. testa oblique obovata^ tumidula^ costis radiantibus 12-14, acutatis, longitudi- 



naliter scepe indistincte striolatis seu costulis filiformibus alternantibus et alteris 



lineis mcrementi confer tissimis transeuntibus ornata; auriculis parvis,fere cequalibus ; 



fovea ligamentali triangularis profunda^ margine cardinali in utroque latere dentibus 



4-5, obliquis, externis ceteris minoribus, instructo. 



The surface of each valve is marked with 12-14 strong radiating sharp ribs, 

 which are finely striolated, and sometimes there is a fine rib visible in the inter- 

 spaces. The ears are nearly quite equal, and each is internally provided with 

 four or five small oblique teeth; the ligamental pit is triangular, median, and 

 very deep. 



The ornamentation of this interesting species closely resembles that of Radula 

 ReichenbacMi, Gein., but the ribs are more numerous and sharp. It also closely 

 resembles Limea Cenomanensis^ Guer., but is evidently a more oblique shell. 



Locality, — Stripermatiir, in a coarse conglomeratic sandstone. 



Formation, — Arrialoor group. 



XLIL Family,— FECTINID^, 



The animals have the mantle margins somewhat thickened, flattened inter- 

 nally, provided with several rows of elongated unequal cirrhi ; those on the external 

 edge are usually longer and possess at their inner bases a row of ocelli ; gills long, 

 semicircularly curved, attached to the anterior and lower base of the adductor, each 

 leaf is doubled on itself, but the duplicature does not reach the base, the poste- 

 rior ends are free ; the fillets composing the gills are very loose ; labial palps sub- 

 triangular, transversally elongated, short, truncate at the end, smooth externally, 

 and more or less distinctly pectinately striated internally, narrowly united in front ; 

 foot small, subcylindrical, sometimes a little flattened at the end, anteriorly grooved, 

 and at the base with a gland, often secreting a bundle of thin, long byssal threads ; 

 adductor subcentral, subcylindrical, short, but very strong. The pedal muscle is 

 very short ; in those species which do not develop a byssus it is confluent with the 

 upper muscular mass of the adductor ; in others which secrete a byssus it is elon- 

 gated, and the short ends are attached to the valves at the upper posterior end of 

 the adductor. The rectum is thin and very long, grown to the posterior side of the 

 adductor, with the end produced into a free tube, reaching as far as the termi- 

 nation of the gills. 



