1S61.] DAVIDSON — DEACniOrODA, SALT-RAN-GE. 27 



Limestone of Moosakhail ; and although the shell is silicified, like 

 many of the other fossils from the Carboniferous Limestone in the 

 Punjab, I cannot help repeating what I said with reference to the 

 preceding species, viz. that it has much more the appearance of a 

 Jurassic or Cretaceous form, e. g. of T. hijplkata, Brocchi, than of any 

 shell of the Cai'boniferous period with which I am acquainted. 



I would therefore call the attention of geologists and palncontolo- 

 gists who may visit the district, to the two last- described shells, so 

 as to ascertain whether they do really belong to the Carboniferous 

 age as stated by Dr. Fleming, or whether they might not have been 

 derived from some less ancient formation. 



3. Tekebratula Himalayensis, Dav. PL II. fig. 1. 



Shell ovate or ovato-pentagonal, longer than wide ; valves almost 

 equally and moderately convex, without sinus or fold ; beak rather 

 small, gently incurved, and truncated by a cii'cular foramen, which 

 slightly overlies the umbone of the opposite valve and thus conceals 

 the deltidium to a greater or lesser extent. The surface of both 

 valves is smooth up to within two or three lines of the margin, where 

 a small number of rounded ribs are developed, of which four or 

 five occupy the front, while two or three ornament each of the lateral 

 portions of the valves ; so that eleven of these short rounded ribs may 

 be counted round the margin of each of the valves. The largest 

 specimen I have seen measured in length 11, width 9, depth 6 lines. 



Tliis appears to be a common and characteristic species of the 

 Carboniferous Limestone of the Punjab. All the specimens from 

 Moosakhail are silicified. 



4. Teeebratula subvesicflaeis, Dav. PL I. fig. 4. 



Shell small, ovato-pentagonal, longer than wide ; valves unequally 

 convex, the ventral one being the deepest ; beak incurved, and trun- 

 cated by a small oval-shaped foramen, which overlies the umbone of 

 the opposite valve. Surface smooth to about half the length of the 

 valves from the beak, while seven small ribs are developed near the 

 margin : in the dorsal valve one or two of these occupy a slight 

 mesial depression ; so that the frontal margin of the valve is usually 

 triundate, from one or two of the central ribs being on a lower level 

 than the lateral ones : in the ventral valve the ribs are somewhat 

 wmilarly arranged. Dimensions generally small ; an average-sized 

 specimen measured 7 lines in length by Gg in breadth. 



This form does not appear rare in a darkish limestone in the 

 neighbourhood of Moosakhail, and differs from T. vesicularis and 

 T. Himalayeiisis by the arrangement of its marginal ribs. 



5. AxnrEis Eoyssii, L'Eveillc, sp. PI. I. fig. 6. 



This characteristic and well-known species is very abundant at 

 Moosakhail, and in several other localities in tlic Salt-range. It is 

 identical in shape with our European specimens, and has been also 

 ound in the black shales in the Chor Holi Pass by Capt. Strachey, 



