202 Br. Perchere on the Geology of Kashmir , [No. 8, 



France, Vol. XII. p. 1180). It is distinguished from this by its well 

 marked sinus, and its fine and numerous spines strewed without order on 

 the surface and not forming concentric series. The P. Humboldti is 

 mentioned by Keyserling as having been found by him in the car- 

 boniferous limestone of the Soiwa, an affluent of the river Petchora 

 on the western slope of the north of the Oural. Mr. Davidson has 

 thought proper to make a new species which he calls P. Purdoni (on 

 some Carboniferous Brachiopoda collected in India by A. Fleming and 

 W. Purdon in 1848 and 1852, Quarterly Journal of the Geol. Soc. of 

 London, PI. 2 fig. 5, 1862) based on specimens similar to those under 

 examination, and which came from Checleroo and Moosakhel (Salt 

 Range, A. M. V.). He gives a drawing, under the name of P. Hum- 

 boldti, of a species on which the spines are fewer and confusedly 

 arranged in quincunces, and of which the sinus is very slight and only 

 visible near the front of the shell. I would regard this rather as the P. 

 pustulosus. 



Productus Cora, (D'Orbigny). Two good specimens possessing well 

 the characters of the species. — Discovered first in the Bolivian plateau 

 by D'Orbigny. This species is one of the most characteristic of the car- 

 boniferous limestone in England, in Belgium, in Spain and in Russia. 



At the time I found it in the last named country D'Orbigny had but 

 just described it ; I did not know his work, and, as this shell varies much, 

 I had made two species of it under the names of P. Tenuistriatus and 

 P. Nefledhoi. It is found on both slopes of the Oural, and also in the 

 white carboniferous limestone of the plains of Russia at Sterbita- 

 mak on the river Oka, and in the carboniferous region of Douety. 

 Finally it is also mentioned in North America. It has therefore a 

 great geological range. 



Four specimens of Productus. That in the black limestone and 

 brought from Kashmir is the P. Flemingii or Longispinus or 

 Lobatus (three names of the same animal). It is one of these Pro- 

 ducti largely distributed on the globe. It has been found on the 

 Mississipi in the state of Ohio and in Kentucky. It exists in Eng- 

 land, in Spain, and in Belgium. Messrs. Keyserling and Murchison and 

 I have found it in the governments of Tiver, Kalonga, on the Douetz 

 as well as on the river Belaja near the glacial sea. The speci- 

 mens from the white limestone of the Kafir- Kote are a distinct 



