212 Appendix. [No. 3, 



(Hall) of the Silurian. It has six ribs, not very conspicuous, and two 

 well-marked lines of growth ; and is ornamented with fine radiating 

 stride. Only one specimen was found at Zeawan. 



Remark. An immense number of small, or perhaps young, 

 Orthisidas occur in the ferruginous dark shale of Zeawan, in some 

 places so abundantly that they cause the shale to exfoliate like a 

 disintegrating mica-schist. The shells are, however, so thin and 

 brittle that imprints alone can be procured. 



Strophomencr analoga (Phill.) ? PL II. fig. 4. 



There is, I think, little doubt of this shell being Phillip's species. 

 The shell is raised in irregular concentric furrows and ridges, and 

 is ornamented by fine radiating strias. Both valves are nearly flat ; 

 the umbones are hardly marked ; the hinge is linear and nearly as 

 long as the greatest diameter of the shell. These Indian specimens 

 are very large, above four inches across. 



Seldom found entire in Kashmir ; but even pieces of it are 

 conspicuous and easily recognized. Good specimens were obtained 

 from the Rotta Roh in the Punjab. 



Strophomena ? sp. PI. III. fig. 2. 



An internal cast only. Found at Zeawan in Kashmir. 



Productus costatus (Soiu.') 



Journal, G-eological Society, Vol. XVIII. p. 31. PI. I. figs. 20, 21. 



Numerous specimens of this well known species were found at 

 Zeawan and Zowoor in Kashmir, and in the Eotta Roh and Salt 

 Range. 



Productus semireticidatus (Martin.) 



Op. Cit. p. 21. 



It varies considerably, some specimens being very transverse. 

 The Kashmir and Punjab specimens are usually very large and often 

 deformed by pressure. 



Zeawan, Zowoor, Barus. Rotta Roh, Salt Range. 



Productus cora (d'Orbigny.) 



Pound abundantly every where in the Zeawan group. 



Productus Humboldtii (D'Orfr.) 



Journal, Geological Society, Vol. XVIII. p. 32. PL II. fig. 6. 



Large specimens found at Zeawan and smaller ones at Barus. 

 Also in the Salt Range and Rotta Roh, Punjab. 



