525 



Fig. 227. Calamorhynchus pellucidus Streets (after Pillai, 1966). 



In the head the longitudinal dorsomedial keel is better developed in 

 the male than in the female. The lateral keels are slightly denticulate, due 

 to them the maximal width of the head occurs at the base of the rostrum 

 and the proximal part, occupied by the eyes, is somewhat narrower. 

 424 The 2nd segment of pereopods I is shorter than the rest of the leg 



and its anterior margin very slightly bulged; the 5th segment is markedly 

 broadened, has bulged sides, and the posterior distal part of the segment 

 forms a broad lobe with a stretched tip and is coarsely denticulate with 

 spiniform submarginal setae; the 6th segment is somewhat narrowed 

 proximally, has a bulged anterior and denticulate posterior margin, and 

 bears sparse spiniform setae on the surface. The 2nd segment of pere- 

 opods n is narrow and shorter than the rest of the leg; the 5th segment is 

 longer than wide, and has bulged margins; the distal margin is obliquely 

 truncate and forms a broad uniformly denticulate lobe with stiff sub- 

 marginal setae; the tip of this lobe has a pointed apical denticle; the 

 6th segment is narrower than in pereopods I and has almost parallel 

 margins. The 4th-6th segments of pereopods III-IV bear sparse setae on 

 the posterior margin. The 2nd segment of pereopods V is broadened and 

 somewhat shorter than the distal part of the leg; the 4th-5th segments are 

 narrow and bear isolated setae on the anterior margin; the 6th segment 



