208 K W. SEXTON. 



Fam. calliopiidae. 



Gen. Apherusa, A. 0. Walker. 



Apherusa bispinosa (Sp. Bate). 



(Stebbiiig (41), p. 305.) 



Station IV. 109 fms. ; 44 specimens ; 30 of these were ovigerous females, 

 6"5-3'75 mm. in length. 



Station X. 146 fms. ; 3 specimens, 1 male and 2 females, the larger of 

 which measured 7 mm. 



These captures are interesting as being the first authenticated 

 records of the occurrence of this species in the open sea far from land. 

 The depth at Station X., 146 fathoms, is the greatest hitherto recorded. 

 A. hispinosa is generally regarded as a purely littoral or sublittoral 

 form, and is usually found living among the algae close inshore. Sars, 

 however, mentions (30), p. 440, " another form or variety living in 

 somewhat greater depths," agreeing in all essential details with the 

 littoral form, but distinguished from it by the larger size, the com- 

 paratively larger and less pigmented eyes, and the lighter hue of the 

 body. The Huniey specimens are of this latter type. They are more 

 slender and more spinose than the shore form. 



The 3rd joint of the palp of the mandible in full-grown specimens 

 is subequal to the 2nd in length, not shorter, as given by Sars for 

 the shore form. 



The antennae are filiform and longer than in the shore animal ; the 

 joints of the flagella very attenuated. The flagellum of the superior 

 antenna is furnished with two sensory filaments on each of the first 

 four joints, and two on alternate joints to the 14th in the female 

 and to the 20th in the large males. Tlie inferior antennae in the 

 female are a little longer than the body ; half as long again in the male. 

 Unfortunately all were broken ; one female of 5 mm. length had the 

 inferior antenna 5 mm. long, fifty-one joints in the flagellum ; and 

 a male 7 mm. long had sixty-three joints still remaining, the broken 

 antenna measuring 7'5 mm. 



The proportions of the joints of the gnathopods are as given by Sars, 

 but the hand and finger differ (PI. Ill, fig. 9). The hand is broader, 

 as in A. clevei Sars, with the palm oblique and subequal to the hind 

 margin in length ; the palmar margin is microscopically serrulate, with 

 the two specialized bristles characteristic of the family, inset on either 

 side of the finger. The finger is much longer in proportion than in the 

 littoral form with four serrations on the inner margin in Gnathopod 1, 

 three in Gnathopod 2. 



