554 



the 6th segment has a few low, highly smoothened denticles on the pos- 

 terior margin. The 3rd segment of pereopods V is articulated with the 

 distal margin of the 2nd, but not submarginally as in species of the genus 

 Platyscelus. The 6th segment of pereopods VI is modified into a long and 

 almost straight claw and the 7th segment, i.e., the true claw, is absent. 

 Pereopods VII consist only of a distally narrowed and forwardly bent 

 2nd segment; apical segments are absent. 



Type species: Hemityphis tenuimanus Claus, 1879. 



1. Hemityphis tenuimanus Claus, 1879 (Fig. 239) 



Claus, 1879b: 12; 1887: 38; Bovallius, 1887a: 46 (Dithyrus); Steb- 

 bing, 1888: 1472. 



Length of males up to 5 mm, of females up to 7 mm. 



The head is short and high, its length 1/3 its height, and its width 

 equal to its height. The flagellum of antennae I consists of a curved basal 

 segment, which is densely pubescent with long hairs on the lower surface, 

 and three distal segments: the first is armed with four straight apical 

 setae, the second with two. Antennae II in males are folded zigzag five 

 times and the length of their apical segment is 2/3 that of the preceding 

 segment. 



The 2nd segment of pereopods I and II is slightly broadened distally, 

 equal in length to the remaining segments together, and bears a few fine 

 setae on its anterior margin; the 4th segment is somewhat longer than 

 wide; the 5th segment without the distal process is also longer than its 

 width; the distal process is narrow and has straight and finely denticulate 

 margins; the 6th segment narrows smoothly distally and in pereopods I 

 its posterior margin bears two denticles, in pereopods II four low and 

 smoothened denticles, often armed with frequent very fine spines. The 

 2nd segment of pereopods V has a uniformly bulged posterior margin, 

 while its anterior margin bulges abruptly in the middle part; the length of 

 the 2nd segment is almost equal to that of the distal segments together. 

 The 2nd segment of pereopods VI has a concave anterior margin while 

 the posterior margin is bulged in the distal part and later becomes straight; 

 the distal segments together are almost half the length of the 2nd segment; 

 the 4th is the largest of the distal segments and has a small distal process; 

 the 4th and 5th segments have a denticulate anterior margin in the form 

 448 of a pecten; the 6th segment is modified into a pseudoclaw but the true 

 claw is reduced. Pereopods VII consist of only the 2nd segment which 

 tapers distally and is strongly curved forward. 



The rami of uropods I are lanceolate and the exopodite is somewhat 

 larger than the endopodite. The exopodite of uropods II is lanceolate and 

 the larger endopodite is broadened distally and rounded. The endopodite 

 of uropods III is fused with the basipodite, strongly broadened distally, 



