OF SOUTHEEN INDIA. 323 



NUCULANA, Link, 1807, (see p. 320). 



1. NucuLANA sociALis, StoUczka, PI. XVII, Pig. 13. 



N, testa jimiore trigomda, adulta ovatim elongata, minuta, solida, incequi- 

 lateralis postice longiore, producta, sensim angusta, sub-recta, et ad terminationem 

 truncatula, area angustissima, superficie polita, prope apices fere IcBvigata, margines 

 versus crassiuscule concentrice striata ; cardine multidenticulato, denticulis foveola 

 minima infra apicem sita interruptis. 



Height of shell ; its length ... ... ... ... 0-59 



Thickness „ : „ ... ... ... ... 0'45 



This little species bears a remarkably close resemblance to some of our eastern 

 forms, like puellata, ventricosa, and an apparently new species from Cochin and Aden. 

 I dredged all three on sandy mud between two and three fathoms of water at the 

 last locality. The peculiarity of the fossil species lies in its posteriorly almost 

 perfectly straight and cuneiform produced shjell. The surface is polished, nearly 

 quite smooth at the beaks, and rather coarsely concentrically striated towards 

 the margins. 



Locality, — Moraviatoor, in a dark brown, calcareous and earthy rock; very 

 common, the specimens having been evidently living in large numbers together. 



Formation, — Ootatoor group. 



2. NucuLANA, sp. ind,, PL XVII, Pig« 14. 



A single cast specimen was found in the brown earthy limestone north of 

 Odium ; it belongs to a Nuculana or a Yoldia. Its broadly oval, sub-equilateral 

 shape, and very numerous denticulations on the hinge margin show it to be distinct 

 from any other species I am acquainted with, but the single impression of a left 

 valve is not sufficient to characterize the species in a way that it can again be safely 

 recognized. It is to be hoped that more and better specimens will in time be found. 



Formation, — Ootatoor group. 



YOLDIA, Milller, 1832, (see p. ^20). 

 1. YoLDiA STRiATULA, Forhes, PL IV, Pig. 2, and PL XVII, Pig. 6. 



1846. Ledob striatula, Forbes, Trans. Geol. Soc, Lond., vii, p. 148, pi. xvii, fig. 14. 



1847. „ indica, d'Orb., Voy. Astrolabe, Pal., pi. v, figs. 11-13. 



1850. „ striatula, Forbes, d'Orb., Prod. II, p. 236, — eadem auctorum. 



Y, testa sub-quadrangulari, elongata, compressiuscula, incequilaterali, antice 

 paulo breviori et ad marginem rotundata, postice producta, subflexuosa, ad marginem 

 late angulatim truncata, regione areali longa, planata, paululum concava, infra earn 

 sulco haud profundo ab apice ad terminationem posteriorem extenso instructa ; super- 



4 K 



