BY WILLIAM A. HASWELL, M.A., B.SC. 1009 



extremity of the propus assume the form of accessory dactyli. The 

 dactylos proper is longer and stronger than these, a little less than 

 half the length of the propus. The uropoda are very short, the 

 inner ramus composed of one compressed joint which is about twice 

 the length of the peduncle ; the outer shorter and narrower, 

 apparently one-jointed- on one side, but on the other showing an 

 articulation (or fracture) about the middle. The total length of 

 the animal is fgths of an inch. 



The only specimen I have was obtained with the dredge in Port 

 Jackson. 



Stenetrium armatum. 



[Plate LI. Figs. 1—12.] 



Stenetrium armatum. Haswell, Proc. Linn. Soc. N.S.W. 

 Vol. V., p. 478. 



The males of this species differ from the females in the form of 

 the first pair of thoracic appendages (see P.L.S., N.S.W. Vol. V., 

 pi. XIX., figs, lc and 1c 1 ), and also in having the flagella of the 

 superior antennae usually, though not invariably, longer. The 

 number of articuli of the inner antennae varies from eight to 

 twelve, and the length varies considerably in different individuals ; 

 the extremity never quite reaches the end of the fourth joint of 

 the peduncle of the inferior pair, and usually does not reach much 

 beyond the distal end of the third joint. Connected with the 

 second joint of the inferior antennae is a movable scale or 

 scaphicerite. The flagellum of the superior antennae is very 

 long, consisting of 115 very short articuli. As in Apseudes, 

 Tanais, and Anthura the mandible has a well-developed 

 palp ; its cutting apex is bi-lobed, each lobe being divided into 

 several teeth ; behind the teeth is a row of strong curved 

 spines. The first pair of maxillae have two rami, of which the 

 outer is the longest, both armed apically with stout, simple spines 

 and hairs. The second pair of maxillae have three lobes, each 

 armed with long simple spines. In the first pair of maxillipedes 

 the basal joint has articulating with it a long, un-jointed, 

 scale-like, pointed, external appendage ; the second joint is 



