316 DR THOMAS SCOTT ON THE 



others becoming attenuated towards the distal extremity ; the second joint is ratlier 

 longer than the first or third ; the fourth, fifth, and sixth are subequal in length, and 

 are each rather shorter than the third ; the three end joints are small, but the penulti- 

 mate one is rather shorter than that on either side (fig. 25). The antennae are similar 

 to those in Parastenhelia cmglica. 



Mandibles small, tolerably slender, and narrower towards the apex, which is armed 

 with three or four small teeth (fig. 26) ; mandible-palp very small and two-branched. 



First maxillipeds simple; terminal claw moderately stout (fig. 27); second 

 maxillipeds furnished with a stout spiniform bristle near the middle of the inner margin 

 of the penultimate joint, and the terminal claw scarcely reaches beyond the proximal 

 end of the same joint (fig. 28). 



All the four pairs of swimming legs are slender. The inner ramus of the first pair 

 is considerably longer than tlie outer and composed of two joints ; the end joint is short, 

 but the first is greatly elongated and furnished with a plumose bristle near the middle 

 of the inner margin, and a few scattered spinules on the distal half of the outer margin ; 

 the terminal claws are slender ; one is moderately elongated, the other shorter. The 

 middle joint of the outer ramus is also tolerably elongated, and the first and second 

 joints are each furnished with a slender spine near the distal end of the outer margin, 

 and there are also several marginal spinules ; the short end joint is armed with two 

 slender terminal claws and two elongated setre ; the second basal joint of tliid pair has 

 the lower margin fringed with small spinules, and a stout seta springs from both its 

 inner and outer distal angles (fig. 28). 



The second, third, and fourth pairs are similar to those in Parastenhelia anglica 

 (fig. 29). 



Fifth pair small ; the inner portion of the basal joint, which is subtriangular in 

 outline, reaches to about the middle of the outer second joint, and bears five setse of 

 unequal lengths round its distal end ; the second joint is broadly ovate, and the outer 

 and inner margins of the proximal portion of the joint are nearly parallel ; but the 

 distal end is somewhat rounded and furnished with six setae arranged as shown in the 

 drawing (fig. 32). 



Habitat. — Scotia Bay, South Orkneys; collected in June 1903; Station 325, 

 60° 43' 42" S., 44° 38' 33" W. 



Remarks. — The genus Parastenhelia was established by I. C. Thompson & 

 A. ScOTT in 1903 for two Harpactids from the pearl-oyster beds in the vicinity of 

 Ceylon.* In the species belonging to this genus, the inner ramus of the first pair of 

 thoracic legs is usually elongated and composed of two joints. Besides the two species 

 from Ceylon, and the one now recorded, another is described in the Crustacea of 

 Devon and Cormvall, by Canon A. M. Norman & T. Scott, p. 148, pi. x. 

 figs. 10 and \\ et seq. 



* Report to the Government of Ceylon on the Pearl-Oy.iter Fisheries of the Gulf of Mannar, by W. A. Herdman, 

 D.Sc, F.R.S. ; Supplementary Report on the Vopepoda, by I. C. Thompson & A. Scott (1903), p. 2C.3. 



(ROY. SOC. EDIN. TRANS., VOL. XLVIII., b(y2.) 



