126 PERCY SLADEN TRUST EXPEDITION 



These specimens are in substantial agreement with Hansen's recent description and 

 I am convinced that they belong to the same species. But I am by no means certain that 

 this form is distinct from E. gli/phiophthalma, lUig. The only important difference in the 

 published descriptions, is that the antennal scale of the latter species is described as four 

 and a half times as long as broad while in E. oculata the scale is three and a half times as 

 long as broad. Illig's figure does not agree exactly with his description, but brings the 

 species much more into line with E. oculata. 



Subfamily Mysinse. 

 Genus Anisomysis, Hansen. 



13. Anisomysis hifurcata, n. sp. (Plate 7, figs. 1 — 6). 



Stations. A, north of the Chagos Islands, 150 fms., one female, 3 mm.; v, Farquhar 

 Island, surface, one male, 5 "5 mm.; w, Farquhar Island, surface, one male, 5 "5 mm. 



Carapace covering all but the last thoracic segment ; produced in front into a broad 

 triangular plate with a pointed apex, which does not reach to the distal end of the first 

 joint of the antennular peduncle. 



Pleon with the first five segments sub-equal, sixth segment nearly twice as long as 

 the fifth ; at the ventral posterolateral corners of each of the first five segments of the 

 pleon there is a small blunt spine, those on the first segment being lai'ger than any of the 

 others. 



Eyes rather large, pigment black. 



Antennular 2)(^'dmiclc (fig. 1) in the male with the terminal lobe large, longer than 

 broad with the distal extremity considerably narrower than the proximal and slightly 

 curved. 



Antennal scale (fig. 2) barely over-reaching the antennular peduncle, about five times 

 as long as broad, the second joint about one and a half times as long as broad ; lanceolate 

 in shape and setose all round. 



Mouth parts and thoracic limbs agreeing essentially with those given in Hansen's 

 definition of the genus, except that I was unable to make out any subjoints in the sixth 

 joint (tarsus) of the third thoracic limb (the only one remaining in any of the specimens, 

 after the first and second pair). 



First, second, third and fifth pleopods in the male, rudimentary plates as in the 

 female ; fourth pair (fig. 5) reaching beyond the sixth segment of the pleon, to the level 

 of the otocyst of the inner uropods, distal peduncular joint three times as long as broad, 

 exopod with the first joint rather more than four times as long as the second, third joint 

 twice as long as the latter, somewhat swollen at the extremity and bearing two terminal 

 branches, the inner with a thickened basal part and a tapering terminal part adorned with 

 setse along both margins, outer branch unjointed, in the form of a long slender spine. 



Telson (fig. 6) as long as the last segment of the pleon and two and a half times as 

 long as broad at its base ; very deeply cleft for more than one-third of its length, cleft 



