298 ON THE ONYKIA ANGULATA. 



O. angulata. 



Two long arms, subcarinated, armed at their ex- 

 tremity by two ranges of hooks, of which the exte- 

 rior ones are larger ; a small disk composed of suck- 

 ers at the lower part of the hand, and several others 

 at the extremity. 



Description. — Body cylindrical superiorly, at- 

 tenuated posteriorly, and terminated in a point, 

 which is enveloped by a subrhomboidal fin, longer 

 than the anterior portion of the body ; its length is 

 two inches and four lines ; its angles are less acute 

 than in the figure before published, which is but a 

 slight variation ; there are eight unequal tentaculae, 

 the superior ones are short, subtriangular, and desti- 

 tute of longitudinal membranes, the two lateral pairs 

 and the inferior ones are furnished with a lateral and 

 exterior membrane, opposed to the suckers; this 

 membrane is less obvious on the superior lateral 

 tentaculae ; these eight tentaculae are furnished with 

 suckers, placed on two ranges alternately towards 

 the base of the tentaculae, and forming but a single 

 range at their extremities ; these suckers are semi- 

 spheric, pedunculated, very small, and protected by 

 a slight border on each side of the tentaculae. 



The two long arms are four inches in length, with- 

 out comprising the uuguiculated extremities ; they 

 are subcylindric and subcarinated, with a slight ap- 

 pearance of articulation at the base of the enlarged 

 extremity which supports the hooks; this extremity 

 is one inch in length, and furnished with two ranges 

 of hooks, about ten in each range ; these are at first 



