253 



slightly concave, forming a distinct angle with the low nargin. The 2nd 

 segment is highly reduced and situated apically on the 1st segment of 

 the flagellum (in young specimens there may be two distinct segments). 

 Antennae II in females are shorter than or equal to antennae I and five- 

 to six-segmented; in males they are notably longer than antennae I and 

 seven-segmented. 

 210 The pereon is equal to the pleon and urosome together, somite I is 



the shortest, the length of the somites increasing from I to IV; somites 

 IV-VI are similar, each approximately twice longer than somite II; 

 somite VII is also the same length as somite II. The 2nd segment 

 of pereopods I is equal in length to the rest of the leg, its length 

 twice its maximum width, and the margins convex; the 5th segment 

 is approximately equal in width and length; the 6th segment is slightly 

 longer, tapers distally, its posterior margin denticulate; the claw is strong, 

 broad at the base, and denticulate posteriorly; the distal part of the 

 posterior margin of the 2nd-5th segments and the anterior margin of the 

 5th-6th segments bear strong setae. The 2nd segment of pereopods II is 

 shorter than or equal in length to the rest of the leg, its length 2.5 times 

 its width, its margins slightly convex; the process of the 5th segment 

 is long and extends to the distal margin of the 6th segment, often even 

 beyond the base of the strong claw; the claw 1/2-1/3 the length of the 

 6th segment. The margins of the lobe of the 4th segment are armed 

 with spiniform setae; similar setae occur on the anterior margin of the 

 5th and the posterior margin of the 3rd; the inner part of the chela 

 is finely denticulate. The 2nd segment of pereopods III has a straight 

 anterior margin, a convex posterior margin, and is twice longer than 

 wide; the 4th and 5th segment together are the same length as the 2nd 

 and 3rd; the 4th segment is barely longer and broader than the 5th; 

 the 6th segment is narrower and equal to the 4th in length; the claw 

 is strong, almost straight and 1/2-1/3 the length of the 6th segment. 

 Ornamentation is weak: a small spinule is present in the distal part of 

 the anterior margin of the 4th segment and a minute denticle along the 

 posterior margin of the 6th segment. The proportions of pereopods IV are 

 the same but all the segments are longer. Pereopods V have a relatively 

 shorter 2nd segment: its length is twice its width and equal to the total 

 length of the 3rd^th segments; the distal part of the anterior margin 

 bears several short spinules; the 5th segment is somewhat longer than 

 the 4th and has sparse minute setae along the anterior margin, which is 

 finely denticulate distally; the 6th segment is slightly curved, 8-10 times 

 longer than wide, and its anterior margin finely denticulate; the claw 

 is almost straight and 1/3 the length of the 6th segment. Pereopods VI 

 are the same length as pair V but stronger and distinguished by their 

 proportions: the 2nd segment is relatively longer, its length 2.5 times 



