STEBBING— ISOPODA 89 



pairs of pleopods, these having the outer branch two-jointed ; the fifth segment without 

 appendages. The uropods as in Apseudes. 



The principal change consists in the omission of the statement that the first and 

 second gnathopods were devoid of a rudimentary epipod, Sars having found on renewed 

 investigation that these rudiments were in fact present in the new genus as in the 

 old. 



The specimen now to be described is unfortunately devoid of the first gnathopods, 

 and the presence of a rudimentary epipod on the second could not be definitely determined. 

 The solitary specimen at command was still smaller than P. latifrons, which Sars speaks 

 of as the least member of the present family, and this minuteness has left me uncertain 

 whether the characters of the pleopods suit the requirements of the genus. I think that 

 they do so, at least in regard to the fifth pair being absent. The agreement of the 

 armature of the first and second peraeopods with that of the second gnathopods is well 

 marked. 



3. Parapseudes hirswtus, n. sp. (Plate 6 b.) 



Head with rostral lamina produced into an apical point and slightly delimited at the 

 base. General shape strongly tapering from broad head to narrow pleon. First five 

 segments of pleon very short, first overlapped by lateral corners of last perseon segment, 

 second and fifth horizontally produced into small lateral processes, the telsonic segment 

 widened near the base, below the tuberculiform widening descending squarely to the 

 insertion of the uropods, the remainder forming an equilateral triangle which reaches the 

 end of the peduncle of the uropods. Three pairs of plumose setae are arranged on the 

 back of this segment, the whole animal being dorsally decorated with such seta? in a very 

 conspicuous manner. 



The first antenna? have a long setose first joint, followed by two short ones ; the 

 principal flagellum of seven joints and the not much shorter accessory of five joints are 

 not nearly so long as the peduncle. The first joint of the principal flagellum is apparently 

 in coalescence with that of the accessory, which in turn is not very distinctly marked oft' 

 from the next following joint. The much shorter second antenna? are wide apart, being 

 inserted just under the first pair. They have a small narrow scale or exopod on the second 

 joint ; the three-jointed flagellum is much shorter than the peduncle. The eyes are dark, 

 the lobes ending in a pointed apex. 



The mouth-organs, as will be seen by the figures, are in substantial agreement with 

 those known for the genus Apseudes. The mandibular palp shows no falling off in setose 

 armature, and the second joint is unusually broad. Between the palp and the cutting 

 edge of the mandible the upper or outer margin shows a fine denticulation. On one 

 member of the pair the cutting edge and the accessory plate are equal. 



The second gnathopods have four stout spines on the inner margin of the fifth joint 

 and six on that of the sixth joint ; upon the apex of this joint there are some microscopically 

 serrate spines. 



The first two peraeopods are very similar in their armature to the second gnathopods. 

 In the three following pairs the strength of the marginal spines is less conspicuous, but 

 SECOND SERIES— ZOOLOGY, VOL XIV. U 



