KKl'oKT ON THE COPEPODA. |u7 



Goniopsylhis? n. gen. 



Head and first thoracic segment coalescent. Abdomen nol much narrower than the 

 cephalbthorax, joints of the cephalothorax very much constricted in front, dilated behind, 

 so ;is to form prominent lateral triangular processes (PI. XLli. fig ; 10). Anterior antenna 

 six-jointed (fig. 11), posterior (fig. 12) three-jointed, destitute of a secondary branch. 

 Mandibles wanting (?), maxillae (fig. 13, a) rudimentary ; anterior foot-jaw srery small, 

 feebly clawed at the apex (fig. 13, b); posterior (fig. 14) much larger, three-jointed, 

 terminal claw very slender. First four pairs of feet nearly alike (fig. la) ; two-branched, 

 branches three-jointed; fifth pair (fig. 16) small, consisting of one branch only. 



Goniopsyllw rostratus, n. sp. (PL XLII. figs. 9-16). 



Length, l-40th of an inch (0"65 mm.). Seen laterally the body is curved, moderately 

 constricted at the internodes, and tapers evenly but very slightly from the head to the 

 tail ; the rostrum broad, prominent, and triangular ; seen dorsally each cephalothoracic 

 segment is narrowed in front, and has its posterior lateral angles produced, strongly 

 directed outwards and backwards, and terminating in a sharp point. Anterior antenna 

 six-jointed (?), slender, about as long as the first body segment, sparingly setose ; the 

 last joint longer than the three preceding. Posterior antenna} three-jointed, bearing a 

 single long seta in place of a secondary branch. Maxilla rudimentary, consisting of a 

 very small limb, which terminates in a single claw ; anterior foot-jaw small, terminating 

 in three small claw-like setae ; posterior foot-jaw three-jointed, first two joints long, 

 slender, and nearly equal, third rudimentary, apical claw curved and extremely slender. 

 The first four pairs of feet have the inner branches a little longer than the outer; both 

 branches bearing long setae but no spines; the fifth pair short, simple, three-jointed, 

 bearing one short and two long terminal setae. Caudal segments very short; terminal 

 setae two or three, very short. 



One specimen only — a male — of this curious species was found. It occurred in a 

 tow-net gathering from Station 318, lat. 42° 32' S., long. 56° 27' \V. 



Its nearest allies are probably to be found in the genera Enhydrosoma, Boeck, and 

 Cletodes, Brady (= IAlljeborgia, Claus), but the mouth-organs in these genera are 

 totally different in character. In Goniopsyllus the maxillae and foot-jaws are extremely 

 small, and the mandible appears to be altogether absent ; at any rate I was unable to 

 find it. The peculiar bend of the feet upon their basal joint calls to mind a similar 

 conformation in Peltidium, while the absence of a secondary branch in the posterior 

 antenna, and the rudimentary character of the mouth-organs, show an affinity to tin 

 Saphirinidae. 



' -/lima, an angle; ^.i/AAo;, a flea. 



