132 



PK0CEEDING3 OF THE GEOLOGICAL SOCIETY. [May 18, 



Letter dated October 6, 1848. 



" Since I had the honour of corresponding with you in spring 

 last, I have seen plates of the ventral surface of Coccosteus, "which 

 fully corroborate the sketch in outline I attempted in one of my 

 communications . ' ' 



Letter dated December 9, 1848. 



" Your favour of the 4th reached me three days ago ; but I de- 

 layed reply till now, that I might be able to send you my promised 

 description of the Coccosteus and the accompanying casts. These 

 last pretty fairly represent the prints with which, when I collect 

 my chapters into a volume, I shall attempt illustrating the chapter 

 of to-day; and should the engravers succeed in doing the subject 

 as much justice as my bits of plaster do it, I shall be well content. 



" One of the number (fig. 5) is a composition of abdominal plates 



Fig. 5. — Abdominal Plates of Coccosteus Milleri. 



^-v 



ranged in what, I think, you will find to be the original order ; the 

 others are transcripts of four of my finer and more instructive 

 specimens. 



