Manchester Memoirs, Vol. I. (igo6), No. 14. 



In order to settle the question of the identity of this 

 species with that of Appellof, we applied to Dr. Richard, 

 director of the Musee oceanographique at Monaco, for 

 permission to examine Joubin's types, and with a generous 

 courtesy, which we most gratefully acknowledge, he was 

 good enough to entrust them to us for comparison. The 

 following is the result at which we have arrived. 



The characters upon which Joubin relies for the 

 distinction of the two species are : — 



C. fimbriatus. 



1. The pectinate fin stops 

 about one quarter of the 

 length of the mantle behind 

 its anterior margin. 



2. The fin has 24 teeth. 



3. The mantle projects 

 backwards into a notch left 

 between the two fins. 



4. The tentacles at most 

 reach a length equal to that 

 of the mantle. 



5. The head is sunk into 

 the mantle, and its breadth 

 appears to be about equal 

 to the diameter of the mantle 

 opening. 



C. cyptinoides. 



1. The pectinate fin ex- 

 tends forward as far as the 

 margin of the mantle. 



2. The fin has 25 or 26 

 teeth, and possibly one 

 more, which cannot be 

 made out with certainty 

 owing to the unsatisfactory 

 condition of the specimens. 



3. The fins are con- 

 tinuous round the hinder 

 end of the mantle so that 

 no notch is formed. 



4. The tentacles are at 

 least three times as long as 

 the mantle. 



5. The head is less deeply 

 sunk into the mantle, and 

 its breadth is less than the 

 opening of the latter. 



