CONCIIOLOGY. 



attached to the side of the stone, containing the fossil. This 

 specimen is remarkable also for the numerous tubercles which 

 invest the upper part, or head, and two appendages, or arms, 

 which hang down on the outside, also tuberculated ; similar 

 traces, or arms, are also visible in the large one, published 

 in a former number. The tail of No. 1 is curiously 

 fimbriated and adorned with tubercles and regularly dimi- 

 nishing. 



No. 2, is the Monoculithos Hexamorphus, and has 

 only six tubercles upon the head, the rest of the body, and 

 what is generally called the tail, is much less ornamental 

 in all its parts than the former. These specimens are gene- 

 rally of a flat shape and character, and the under side 

 seldom distinguishable from the upper, and therefore not 

 to be seen completely all round. There is, however, a 

 striking likeness in the general analogy of the parts, which 

 may perhaps lead to a further investigation of their anato- 

 mical structure. It may also perhaps be necessary in this 

 part of our subject to add the conjecture of an ingenious 

 modern naturalist, who supposes them to be the larvae, or 

 chrysalis of some large Moth, or Insect, in a withered or 

 contracted state. 



