HIMALAYAN FOSSIL SHELLS. 



113 



formations of Europe. How far that analogy may be complete or not, 

 must be left to future investigation. But the wonderful similitude which 

 has, as yet, obtained in fossils from different parts of the world, leads 

 us to hope that the principal members of each group will be hereafter 

 supplied. While we are on the subject, however, we cannot so well 

 estimate the real amount of progress we have made in the question, as by 

 recapitulating, on the other hand, the leading names in each division, 

 which are as yet wanting to us. 



We have nothing either of Encrinal or Coralline remains, which are 

 so abundant in the transition rocks of Europe, that their absence here 

 seems remarkable. We have none of the extinct order of Trilobites, the 

 presence of which is peculiar to transition rocks. 



We have no remains of the two vast marine lizards, the Icthyosaurus 

 and Plesiosaurus, the bones of which every where mark the presence of 

 Lias, and (I speak from authority in saying) without the discovery of 

 which, we must not attempt to use the term Lias in Indian Geology. We 

 have neither of the three shells, the Ammonites Bucklandi, the Plagios- 

 toma Gigantea, and the Gryphcea Incurva, which are also considered as 

 characteristic of that formation — nor have we any of its vegetable remains, 

 which are both numerous and interesting. 



I must now again beg to be excused for the imperfections of this 

 paper, and the great length to which it has been extended. 



Note. Since the above was written, SiR Charlks Grev has kindly put into my 



hands some specimens he lias just received iVom the same quarter— Mr. James Phinsep 

 has also lavoured me in a simihir manner. — They are as iollows : 



1st. The two lurniiT varieties (if the -lu ll I h.i\e called Prodiu ta a lliird. m liirli 

 can hardly be said to diller from the Producta Scotica— besides what ai)i)ears to have i»een 

 the larger \alv(> of an ineciuivalved Bi\al\e resend)lini;- Pniducla— the hinge straight 

 linear; the shell niark(>d with lungitudinal furrows and ridges, and a deep depression, as 



