252 General Characters of the Genus Cymbulia. [Apr. 16, 



tioned by the same authority I have not been able to discover, but in 

 the figure they are represented as set in the two central processes, 

 -which would appear to be a modification of the metopodium of other 

 Pteropods. 



The fins are said to be rounded and connected ventrally (?) by an 

 elongated lobe, but this statement is not quite correct. The two fins 



together form a broad continuous reniform plate, with an unbroken 

 curved outline in fronfc, and a hilum-like notch behind, where the 

 mouth of the animal is situated. Nevertheless, the epipodial expan- 

 sion exhibits a tendency to fall into folds that might suggest the idea 

 of a ventral lobe if the animal were reversed in its shell. 



The posterior margin of the fins on each side presents a dilamina- 

 tion which gradually widens towards the middle line so as to include 

 the mouth, and form two distinct, but quite linear, labia or lips. 



The beautifully transparent shell of this species (probably C. Peroni) 



