576 



2. Pereopods I shorter than pereopods 11; 5th segment sUghtly broad- 

 ened, its distal angles stretched into small rounded lobes (posterior 

 always more so than anterior) 1/6-1/5 length of 6th segment; 4th seg- 

 ment of pereopods VI with distal process. Endopodite of uropods I 

 lanceolate, rather narrow 4. Parascelus Claus. 



— Pereopods I longer than pereopods II or equal to them; 5th segment 

 not broadened and without distal lobes; 4th segment of pereopods VI 

 without distal process. Endopodite of uropods I strongly broadened 

 distally 3. Thyropus Dana. 



3. Pereopods I and II similar in structure, with chelae; anterior margin 

 of posterior distal process of 5th segment denticulate only in distal 

 part, and rather deep notch present between denticulate area and base 

 of 6th segment 1. Euscelus Claus. 



— Pereopods I and II dissimilar in structure, pereopods II with chelae; 

 distal process, if present, short in pereopods I, and notch on anterior 

 margin of posterior distal process absent 4. 



4. Distal process of 5th segment of pereopods I short. Anterior margin 

 of posterior distal process of 5th segment and posterior margin of 



465 6th segment of pereopods 11 denticulate throughout length. Seventh 



segment of pereopods V very slightly shorter than 6th 



5. Hemiscelus Stew. 



— Distal process of 5th segment of pereopods I barely perceptible or 

 absent. Distal process of 5th segment of pereopods n with a few sub- 

 apical denticles on anterior margin; remainder of its anterior margin 

 and posterior margin of 6th segment smooth. Seventh segment of 



pereopods V shorter than half length of 6th segment 



2. Schizoscelus Claus. 



1. Genus Euscelus Claus, 1879 



Claus, 1879b: 22; 1887: 43; Spandl, 1927: 251; Bowman and Gruner, 

 1973: 57. 



The flagellum of antennae I in males in four- segmented and the 

 length of the 1st segment just barely more than its width. The 2nd and 

 3rd segments of antennae II in males are longer than the next two seg- 

 ments. The 2nd segment of pereopods I and II is short and the anterior 

 margin of the immovable part of the chelae curved proximally, but dis- 

 tally straight and denticulate. The 2nd segment of pereopods V and VI 

 is markedly broadened. Pereopods VII have a full complement of seg- 

 ments. In uropods I, and more so in uropods II and in, the peduncle is 

 shorter than the rami and the exopodites are shorter and narrower than 

 the endopodites. 



Type species: Euscelus robustus Claus, 1879. 



