igi6.] Fauna of the Chilka Lake : Mollusca Gastropoda, etc. 351 



Kelly a mahosaënsis * Preston, 1915, p. 298, fig. it. 



K. mahosaënsis is represented in our collection by the type specimen only, a 

 minute shell found with typical K. chilkaënsis in the outer channel. 



Family Galeommidae. 



Scintilla chilkaënsis * Preston, 1915, p. 299, figs. 12, 12a. 



S. chilkaënsis was not uncommon near Satpara and Barhampur I. in the 

 freshwater season on a bottom of mixed c^n /Vp 



sand and mud, but was not found in salt ^^^^^^Tav 7 ?^ 



water. J$Sg / cA » £^- 



The mantle closely resembles that of 5. hyda- WßL^ c '^\~-'~H /l ^ ly^^ 



Una, Deshayes, as figured by Lynge l ; the papil- (H=\ * ^ ' k ' ^K\ 



lae on its margin being long and finger-shaped. lJ> / ~^nr~^' 



The mantle was yellow and the tentaculiform Fig. 4.— Scintilla chilkaënsis, Preston, 

 marginal papillae were pale with deep orange Specimen with mantle expanded, covering 

 tips, those of S. hydatina being described as the greater part of the shell (from an ex- 

 deep red. ample preserved in spirit). 



Family Cardiidae. 



Cardium (Fulvia) rugatum, Gron., Reeve, Conch. Icon., II, Cardium, pi. xii, 

 fig. 63 (1843). 



A few young molluscs of this species were taken just inside the mouth of the 

 lake in salt water. C. rugatum, like Mytilus smaragdinus , is doubtless an occasional 

 visitor to the outer part of the lake-system in the salt-water season. 



Family Veneridae, 



This family is represented by no less than seven species {four genera) , but only 

 one form, dementia annandalei , now occurs living in the main area of the lake. 

 At least one other, Meretrix casta 1 , is abundant in a sub fossil condition at the head 

 of Rambha Bay and on Barkuda I. 



Meretrix meretrix (Lam.), Reeve, Conch. Icon., XIV, Cytherea, pi. iii, fig. 10 ; 1864 



(as C. impudica). 

 Common in the outer channel. 



Meretrix casta, Chemn., Reeve, Conch. Icon., XIV, Cytherea, pi. vii, fig. 25 (1864) ; 

 syn. Corbicula {Velorita) satparaënsis, Preston, 1914, p. 306, fig. 22. 



Blanford 3 states that this species is characteristic of estuarine waters on the 

 Indian coasts. It is still fairly common in the outer channel of the Chilka Lake, 

 where it buries itself in a bottom of mixed sand and mud, and probabby occurs 



1 Dauske Vid. Selsk. Skr. (7), nat. og math., V, iii, p. 186 (1909). 



% There seems to be great confusion as to the Indian species of this genus and it is possible that a 

 further systematic study will considerably alter the synonymy at present accepted. 

 ? Rec. Geol. Surv. Ind., V, p. 61 (1872). 



