I M KA MALAC08TRACA. III. ,,, 



the basal spine is moderately slender and somewhat short, with the end setiform; on the outer side 

 ( the joint somewhat below the upper margin eight strong, stiff setae arranged in a row. The sixth 

 joint is t\\ice as long as deep, with four setae on the lower and nine along the upper margin; seventh 

 joint not marked off from the short claw. -- (Seventh pair of legs lost) 



The abdomen (fig. 5 e) seems to be proportionately a little longer than in D. globifffis and. 

 besides, less ovate. Uropods a little more than half as long as the abdomen; the exopod slightly 

 n:. 'i< than half a.s loug as the endopod (fig. 51). 



Length of the single female with marsupimn 2-2 mm. 



Remarks. As already stated, /). latif>cs is allied to D. glohm-fa but it is easily distinguished 

 the second pair of legs, especially by its proportionately broader fifth joint with the very thick 

 spines, and by the broader sixth joint with four setae along the lower margin. 



Occurrence. Taken by the "Ingulf at a single station. 



Davis Strait: Stat. 25: Long. 633<>' N., Lat 54 as' W., 582 fath., temp. 3-3*; 5 spec, (mutilated). 



69. Desmosoma longispinum n. sp. 

 (PL X, figs. 6 a 6 \\ 



Female and Male. The whole upper surface of the body peculiarly sculptured, as each seg- 

 ment is adorned with numerous longitudinal, though somewhat irregular and partly interrupted, fine 

 keels. - First thoracic segment large, a little longer than the second, which is as long as, or a little 

 longer than, the fourth: in the male (fig. 6e) the epimera at all four segments are produced into 

 extremely long processes, a little or somewhat longer than their segment and differing little in length, 

 while in the female (fig. 6 a) the processes of the two first pairs are not mucrfshorter than in the male, 

 but the third pair are considerably and fourth pair much shorter than in that sex; the first pair of 

 processes are in both sexes directed forwards, the following pairs, besides, gradually somewhat outwards. 

 Fifth segment a little broader near the anterior than at the posterior margin, with the lateral margins 

 slightly concave, and the antero-lateral angles broadly rounded; the segment is in the female some- 

 what, in the male only a little, broader than long. 



First pair of legs (figs. 6b and 6g) slender; fifth joint about five times as long as deep, at the 

 lower distal angle with two stiff seta; somewhat shorter than sixth joint, and two somewhat shorter 

 seta; on the lower margin, the most proximal near its middle; sixth joint slender with a single seta 

 at the lower distal end. -- Second pair (fig. 6c) somewhat longer than, but almost as slender as. first 

 pair; fifth joint more than five times as long as deep, increasing slightly in depth from base to end. 

 with five stiff setae along the lower margin, and the distal seta inserted at the distal angle and almost 

 as long as sixth joint; the last-named joint has two long setae at the distal part of its upper margin, 

 and a single short seta at the middle of the lower margin; seventh joint is uncommonly long. Seventh 

 pair of legs (fig. 6d) slender; fifth joint with about seven thin setae on the distal part of the lower 

 margin, and some of them (probably five) extremely long; sixth joint very slender, with about four 

 long seta: and one shorter seta on the lower margin. 



Abdomen in the female (fig. 6 a) considerably longer than broad, subrecungular, with the antero- 



