no. 3628 GENUS PARANTHESSIUS — HUMES 7 



weakly delimited from head. Epimeral areas of first and second meta- 

 somal segments apparently distorted by swelling of prosome (fig. 34) . 



Segment of leg 5 (fig. 36) 69m x 133/x. Genital segment 195m x 190m- 

 Areas of attachment of egg sacs dorsolateral. Three postgenital seg- 

 ments 73/u. x 104m, 57m x 91m, and 91m x 86m, from anterior to posterior. 

 Caudal ramus 102m x 30m, 3.4 times longer than wide, slightly shorter 

 than in P. protothacae. 



Ratio of length of prosome to that of urosome 1.5:1. 



Egg sac (fig. 34) elongated, 1.25 x 0.26 mm in one female, 1.73 x 0.29 

 mm in another, with many eggs each about 86m in diameter. 



Rostrum (fig. 37) as in previous species. 



First antenna segmented and armed as in P. protothacae, but shorter, 

 about 285m long- Lengths of segments (measured along posterior non- 

 setiferous margins) 16m (42m along anterior margin), 61m, 25m, 51m, 

 43m, 36m, and 27m respectively. All setae naked. 



Second antenna segmented and armed as in P. protothacae. Claw 

 59m along axis. 



Labrum, mandible, paragnath, first maxilla, and second maxilla as 

 in P. protothacae. Maxilliped resembling that of previous species, but 

 the two setae on second segment more nearly equal and fine hairlike 

 ornamentation on first two segments apparently absent. 



Postoral area as in previous species. 



Legs 1-4 segmented and armed as in P. protothacae. Outer edge of 

 first segment of exopod of leg 1 without small spinules. Last segment 

 of exopod of leg 4 with the formula 11,1,5 in each of 10 females. Last 

 segment of endopod of leg 4 (fig. 38) shaped as in previous species 

 but shorter, 57m x 24m, its two terminal spines 44m (outer) and 60m 

 (inner) in length. 



Leg 5 (fig. 39) with the free segment 43m x 16m, ornamented with a 

 small distal outer spinule, terminal seta 50m, and subterminal spine 

 18m with narrow lamellae. 



Leg 6 as in P. protothacae. 



Color in life in reflected light slightly amber, eye pale red, egg sacs 

 whitish opaque. 



Male. — Body form much like that of male of P. protothacae, as 

 shown in figures 24, 25. Prosome not tumid. Length (without the ramal 

 setae) 1.38 mm (1.25-1.50 mm) and greatest width 0.44 mm (0.39- 

 0.48 mm), based on 10 specimens measured in lactic acid. 



Genital segment (fig. 40) 260m x 252m- Four postgenital segments 

 69m x 99m, 69m x 94m, 51m x 81m, and 92m * 79m, from anterior to 

 posterior. 



Caudal ramus like that of female, 101m x 30m- 



Rostrum similar to that of female. First antenna 297m long, seg- 

 mented and armed as in male of P. protothacae. Second antenna as 



