1840.] 



On the Geology of Catch. 



363 



speci^^s is half-way between the mouth and the margin, in the greater 

 size of the papillae, and in being much thinner. 

 Tertiary Formation. Loc. Soomrow. 



(Fossils from the Tertiary Formations, Cutch.) 



Se?'pula ? recta. An oval, free, slightly- waved shelly tube, which we 

 have provisionally called a Serpula, although it is more like the tube of 

 a Teredo ; but it appears to have been formed in loose sand. Diameter 

 f inch. 



Loc. near Kotra. 



Siliquana Grantii. Spirally striated ; striae crossed by numerous 

 cracks; fissure composed of a series of oval pores. It differs from the 

 recent S. anguina only in the smallness of the pores which form the fis- 

 sure. 



Loc. Borders of the Rutin. 



Balanus suhlcevis. Sabcylindrical with curved valves, nearly smootho 

 Operculum ? Diameter 1 inch, height 9 lines. Parasitic upon shells. 

 Loc. Soomrow. 



Corhula tf'zgonalis. Trigonal, with the front rounded, gibbose, anti- 

 quated ; valves nearly equal, posterior side truncated obliquely with a 

 carina upon each valve, and pointed ; umbones equal, central. Length 

 6 lines, width 8 hnes ; but these proportions vary. 



Loc. Borders of the Runn. 



Corhula rugosa. (Lam. vol. v. 497.) This differs from the last in 

 being a much wider shell, with more regular and prominent laminae 

 upon the surface. Length 2i lines, width 8| lines. 



Loc. Borders of the Runn. 



TelUna exarata. Ovate, compressed, ornamented with many erect 

 concentric laminae ; the posterior extremity pointed, much bent. Length 

 nearly f of the width, which is nearly 2 inches. 



Strongly resembling Tellina virgata, (Lam. Hist. Nat. vol. v. 52.) 

 but wider and more bent. 



We have ventured (contrary to our usual custom) to complete the 

 surface of this shell, although much has been lost from the specimen. 



Loc. Soomrow. 



Venus granoaa. Obovate, truncated, posteriorly convex, ornamented 

 with erect concentric laminae, crossed by numerous strias which cut these 

 (near the margin) into rounded grains ; lunette broad, pointed, convex ; 

 beaks nearest the anterior extremity. Length 1 § inch, width more than 

 2 inches. 



