28 mocEEDns'GS of the geological society. [Nov. 20, 



6. Athteis sijbtilita (Hall, sp.), var. grandis, Dav. PI. I. figs. 7, 8. 



Tercbrahila suhiilHa, Hall (?) in Howard Stansbury's Exploration 

 of the Valley of the Great Salt Lake of Utah, p. 409, pi. 2. 

 figs. 1, 2 ; 1852. 



This appears to be a common species in the Punjab, having been 

 found in several localities, but more abundantly at Moosakhail. 

 It varies also considerably in shape and size ; so that (as justly ob- 

 seiTcd by Dr. Shumard while describing this shell from the Carbo- 

 niferous strata of the Ked Eiver of Louisiana) we are very liable to 

 multiply species from its varieties, unless a large number of speci- 

 mens are under examination. Some of our Indian examples are 

 exactly similar to those from Iowa, or from Pecos Village in New 

 Mexico, whence the type of the species was obtained ; while others 

 are larger and more inflated or globose than any I have hitherto 

 seen from either Europe or America, although these last w^ould agree 

 very well with certain specimens described by Dr. Shumard from 

 Washington county, Arkansas. The largest Punjab specimen which 

 has come under my observation measured in length 21, width 18, 

 depth 17 lines. 



7. Eetzia eadialis (Phillips, sp.), var. Geandicosta, Dav. PI. I. 



fig. 5. 



Shell longitudinally oval or ovate, with almost equally deep or 

 convex valves ; the beak is produced, and truncated by a small cir- 

 cular foramen, which is slightly separated from the hinge-line by a 

 small hinge-area ; each valve is ornamented with about thirteen or 

 more angular ribs, of which the central one is somewhat the largest, 

 and corresponds to a groove of greater depth in the ventral valve. 



Our British specimens of U. radicdis are extremely variable in size 

 and plication. In the typical form the ribs are smaller and more 

 numerous than in the Punjab variety; while identical specimens of 

 this last have been found in England, as well as in the Carboniferous 

 rocks of Bolivia. Dr. Fleming states that he has found this shell 

 rather abundantly near Moosakhail, 



8. SriRiFEEA STRIATA, Martin, sp. PI. I. figs. 9, 10. 



Of this shell Dr. Eleming was able to procure but three or four 

 fragmentary specimens, which could not be distinguished from simi- 

 lar British examples of Martin's species. It occurs at Nullc, Che- 

 deroo, and several other localities. 



9. Spirifera Moosakhailensis, Dav. PI. II. fig. 2. 



Shell transversally subrhomboidal ; valves almost equally deep 

 or convex ; hinge-line variable in length, sometimes not half as long 

 as the breadth of the shell, while at times it is as long. Ventral 

 area of moderate width ; fissure wide and partially arched over by a 

 pseudo-deltidium. Dorsal valve sublinear; beak small and mode- 

 rately incurved. In the dorsal valve there exists a wide, elevated 

 angular fold, and in the ventral one a corresponding sinus. The 

 whole surface of the shell is covered with niunerous small ribs, which 



