262 "thetis" scientific results. 



CYMODOCE ACULEATA, Haswdh 



Cymodoce aculeata, Haswell, Proc. Linn. Soc. N.S.W., 1880, v., 

 p. 474, pi. xvi., fig. 6; Id., Aust. Mus. Cat. v., Crustacea, 1882, 

 p. 291. 



Stations 33, 50. 



This species is represented by twelve examples ; in the original 

 diagnosis the fixed ramus of the uropod is stated to be emarginate ; 

 the emargination is scarcely discernible in the types ; the distal 

 extremity is obliquely truncated, and apparent epaargination is 

 due to a slight median depression on the superior surface. Fourth, 

 fifth and sixth joints of the first pair of legs armed with spines ; 

 the same joints in the succeeding pairs are densely covered with 

 numerous short hairs and a few stiff setse. The mandibles are 

 moderately robust, the apical denticle is blunt, the lateral one is 

 subtrilobate at the apex, and the accompanying spines are mostly 

 simple ; a few of the larger have two or three irregularly disposed 

 spinules. Palp three-jointed, with the basal joint the longest. 

 Inner process of first maxillae slender, armed at the tip with four 

 spines, each of which bears numerous long spinules. Outer pro- 

 cess with about twelve or fourteen stout, smooth, curved spines. 

 Lobes of the second maxillse armed with pectinate spines ; the 

 inner lobe is rather broad, and the fringe of spines extends some 

 distance along the oblique inner border. Upper and lower por- 

 tions of the second joint of the maxillipedes subequal ; there is a 

 short curved filament at about the distal third on the inner 

 border, and the truncated apex bears about fourteen or more 

 short, stout, strongly-pectinated spines. Second, third and fourth 

 joints with well-developed superior lobes ; fifth joint cylindrical, 

 tipped as well as the lobes with long, simple setse ; there are also 

 a few long hairs at the inferior distal extremities of the joints. 

 Peduncles of the first three pairs of pleopods with three to five 

 spines situated at the interno-distal angle. Inner ramus of the 

 first pair nearly triangular. Outer ramus much longer than the 

 inner, more than twice as long as broad, and twice as wide 

 distally as proximally, with the outer margin straight. Rami of 

 the second pair equal in length, and proportionately broader 

 than those of the first; the outer ramus is obovate, and the inner 

 cone-shaped in outline, with a slender stylet about one-third longer 

 than the ramus ; in its basal two-thirds the stylet is fusiform, 

 and the terminal third is cylindrical, and bears numerous hairs, 

 which become more evident as the acute apex is approached. 

 Outer rami of the tliird, fourth, and fifth pairs with a subapical 

 suture ; the fifth has sevei'al distal tubercles, which, as well as 

 the margin, exhibit a closely-placed series of rasp-like teeth. 

 There is a rounded tubercle at the summit, a compressed one on 



