214 NERBUDDA DISTRICT. 



these stems are found, deserve the name of limestone; but it is calca- 

 reous, and, close by, passes into a limestone. Capt. Nicolls on the con- 

 trary throughout his notes, speaks of it as " black soil," " bole," " allu- 

 vium," leading to an erroneous conclusion that it was the ordinary 

 surface soil of the district, whereas it is a portion of these ** intertrap- 

 pean" beds of which we have been above speaking. 



Capt. Nicolls'(«) statements with regard to the measurements and 



6. Achatina pench (n. s.) The affinities of this fossil are obscure. There are several 

 varieties which so run into each other, that they cannot be separated, although 

 they are probably specifically distinct. They occur abundantly at Telankheri. A 

 lengthened specimen, of 7 whorls, measures 0.34 — 0.14— another of less elon- 

 gated form, of 6 whorls 0.28—0.15. 



7. Achatina Eos (n. s.) A more elongate form than the last and apparently a distinct 

 species. A specimen of 9 whorls measuring 0.37 — 0.13. 



Unio. 



1. Unio Deccanensis. Sow. This species does not occur at any of the localities visited 

 by the officers of the Survey. The shell is stout, externally smooth, and devoid 

 of either concentric or radiating lines. The internal layers, however, when the 

 surface of the shell is abraded, exhibit strong furrows and ribs radiating from 

 the umbones to the margin, which is thereby rendered, crenulate. The peculiarity 

 is well marked in a specimen from Katrumi, but traces of the same structure are seen 

 in the perfect specimen from Ellichpur. A fine specimen measures 1.70—2.67. 

 There is a marked variety (? different species,) much more quadrate, but in absence 

 of better specimens, it cannot be discriminated. 

 Ctclas (? Pisidium,) 



1. C. lens (n. s.) Two specimens of a small bivalve, provisionally referred to this genus 



were found at Goraha. The largest has a breadth of 0.18 

 It is to be understood that the MS. specific names which have been given to these shells, 

 and which are those under which they have been exhibited in the Museum, Calcutta, since 

 July 1858, are simply used here for the sake of distinction. Mr. Hislop's detailed descrip- 

 tions, when made public, will doubtless include all the varieties and his names will be retained. 

 I must add that the measurements, &c, which are in Inches and decimals, have been 

 prepared by my colleague, Mr W. Theobald, Junr,— (T. Oldham, Oct. 1859.) 



(a) Capt. Nicolls speaks of the flow of trap which he supposes to have overturned 

 these trees, as being 4 feet 6 inches thick} and doubts that this would be sufficient to pro- 



