318 DR. H. J. HANSEN" ON THE [NoV. 29^ 



1. Stenetrtum armatum Hasw. Ovigerous female (and adult 

 male, after Haswell*). (Plate XIX. figs. 1 a-1 d.) 



1881. Steiietrmvi arinatuvi Haswell, Proc. Linn. Soc. Xew South 



Wales, vol. v. p. 479, pi. xis. fig. 1 [teste Haswell]. 



1882. Stenetrtum armatum Haswell, Catal. Austral. StaUc- 



and Sessile-eyed Crust, p. 308. 



1884. Stenetri'um armatum Haswell, Proc. Linn. Soc. Xew 

 South Wales, vol. ix. pp. 1009-1010, pi. li. figs. 1-12 

 [teste Zool. Rec. and Beddard]. 



Head has its upper surface — the frontal plate excluded — 

 more than twice as broad as long ; the lateral part is expanded 

 and flattened, the anterior corner produced into a rather long 

 acute process with a minute tooth on the outer margin ; the fi'ont 

 margin outside the base of each antennula pi'oduced into a rather 

 large, triangular, very acute process. Eyes semilunar, long, ob- 

 lique, with the posterior outer margin rather close to the lateral 

 margin of the head. 



Antennulfe have the second joint of the peduncle slightly shorter 

 than the third and rather thick ; flagellum of the female is much 

 shorter than the peduncle, with about seven joints. 



Antennse have the basal joint, seen from above, anteriorly at 

 the outer side produced into a rather long acute process reaching 

 slightly beyond the end of the second joint and with a small saw- 

 tooth on the outer edge. 



First thoracic legs. — In the female the distal half of the upper 

 part of thu'd joint is expanded, compressed, and produced into a 

 long curved process ; nearly the whole upper side of fourth joint 

 is expanded, compressed, and produced into a long process 

 directed forwards ; fifth joint with upper distal angle subrect- 

 angular and without process, lower angle rounded. The hand 

 not fully twice as long as deep ; upper mai'gin rather convex, 

 lower margin at least as long as the depth, straight, with many 

 long setae ; the angle between the lower margin and the palmar 

 edge measiu-es nearly 110°, is somewhat rounded, with a long 

 strong spine ; palmar edge nearly straight, with several thick 

 sette serrated along their upper margin. Seventh joint with the 

 short claw claw-shaped ; the lower margin of this joint armed 

 with a close row of short spines with a few saw-teeth along the 

 lower margin. — In the male third, fourth, and fifth joints in all 

 probability as in the female, the hand is, according to Haswell's 

 figure, oblong as in the female, but it has two deep incisions in 

 the palmar edge, and the process between them is bidentate ; the 

 " claw " reaches a little beyond the palm. 



Abdominal shield is somewhat broader than long. Each lateral 

 margin has about foiu' obscure saw-teeth, besides the usual 

 rather long tooth at the notch. The posterior margin is strongly 

 convex and a little sinuate. 



* Mr. R. I. Pocock lias kiudly traced for me the figures given by Haswell in his 

 first paper. 



