1861.] DAVIDSON BRACniOrODA, SALT-RANGE, 81 



The valves are ornamented with from twelve to fourteen angular 

 ribs ; while the entire surface (area excepted) is covered with a great 

 number of minute crcnulated stria;, which increase in number by the 

 intei-polation of smaller stria% especially close to the margin. The 

 largest example I have seen measured 20 lines in length, by about 

 the same in width and 14 in depth. 



This beautiful shell is not rare in the Carboniferous Limestone of 

 Moosakhail, Chederoo, Niille, and Kafir Kote ; and appears to mo 

 to be quite distinct from any of its congeners. 



17. Orthis resupinata, Martin, sp. PI. I. fig. 15. 



Of this well-known species one or two examples have been col- 

 lected by Dr. Fleming in the Punjab. 



18. PfiODTjcirs STRiATUs, Fischcr, sp. PI. I. fig. 18. 



This European Carboniferous shell does not appear rare in a light- 

 yeUow limestone at Khond in the Punjab. 



19. Prodfcttjs longispintjs, Sow. (=P. Flemingii ejusd.). PI. I» 

 fig. 19. 



Two .specimens exactly agreeing with Sowerby's type have been 

 found by Dr. Fleming, at Moosakhail in the Punjab, and at Srinug- 

 gur in Kashmir ; the specimen figured in my plate is the one iden- 

 tified by M. De Yemeuil and myself in 1853. 



20. Productfs Cora, D'Orbigny. 



Specimens identical with those of America and Europe have been 

 found at Kafir Kote, Moosakhail, (fee. 



21 . Productxts semireticulatus. Sow. 



Of this species two or three specimens have been found in the 

 Punjab by Dr. Fleming. 



22. PEODrcTUs cosTAirs, Sow. PL I. figs. 20, 21. 



This appears to be one of the most common species in the Carboni- 

 ferous Limestones of the Punjab. It occurs at Moosakhail, Kafir 

 Kote, &c., where it has sometimes attained large proportions, as may 

 be seen from the specimen figured in my plate. The Indian ex- 

 amples are exactly similar to those we find in Europe. 



2.3. Productus Purdoni, Dav. PI. II. fig. 5. 



SheU longitudinally oval, broadest at two-thirds the length from 

 the beak ; ventral valve moderately convex, flattened along the middle 

 and longitudinally di\-ided into two lobes by a deep sinus, which com- 

 mences at the extremity of the beak and extends to the front. Beak 

 and cars small ; hinge-line very short, and generally not exceeding 

 half the breadth of the shell. The dorsal valve is very much flat- 

 tened until within a short distance from the margin, where it be- 

 comes concave, and is divided ])y a mesial elevation, whicli commences 

 close to the hinge-line and extends to the front. Exteriorly the 



