318 TEOFESSOR E. RAY LANKESTEE. 



rounding the mouth, which appear to represent the shorter 

 arms of other Cephalopods. 



I cannot conclude this notice without drawing attention to 

 the correctness of Suhm's recognition of a general resem- 

 blance between his young Procalistes and such a Pteropod as 

 Pneumodermou, The reduction of the forefoot in the 

 former to the condition of two long sucker-bearing arms and a 

 minute set of perioral sucker-bearing processes, finds its 

 parallel — its " homoplast," if I may use a term introduced by 

 me some years ago — in the condition of the same parts in 

 Clione and Pneumodermon. 



Lastly, is there not some resemblance to the condition of 

 the Belemnitidse in the marked projection of the terminal 

 region of the body to which the lateral fins are attached, and 

 in which the pen (in these young specimens at any rate) is 

 most strongly developed, as also occurs in the living genus 

 Ancistrocheirus ? 



