Thomson. — On Parasitic Copepoda. 359 



3. Dinematura neo-zealanica, n. sp. Plate XXV., fig. 2, 

 a-d ; Plate XXVI., fig. 1, a-c. 



Male. — Body nearly quite flat. Cephalothorax nearly 

 round and half as long as the body, posterior angles acute and 

 curved inwards. Penultimate thoracic segment short, curved 

 posteriorly, and rather acute at the outer margins. Last 

 thoracic segment nearly as broad as long, posterior niargins 

 ending in a short tuft of seta;. Abdomen not half as long as 

 preceding segment, and only one-third as broad, 2-jointed ; 

 1st joint short, 2nd nearly quadrate. Caudal lamellae half as 

 long as last segment of thorax, narrow. Feet of fourth pair 

 2-branched, each branch furnished with plumose setas. 



Length, 5-6mm. 



Feynale. — Body flattened. Cephalothorax not half as long 

 as body, rounded at its posterior lateral angles, the posterior 

 margin strongly toothed on the back. Dorsal lamellae of the 

 penultimate thoracic segment wing-like, nearly square, as 

 broad as the cephalothorax, and reaching back to the genital 

 segment. Dorsal lamella; of last thoracic segment oblong, 

 rounded and smooth, reaching almost to end of caudal 

 lamellae. (The extremely broad, wing-like lamelhe of this 

 sjjecies give the females a very square form.) Fourth pair of 

 feet 2-branched, each branch 1-jointed. joints flattened and 

 furnished with a few very short spines. 



Length, 9-lOmm. ; length of oviferous tubes, 20-25mm. 



The first antenncB are normal ; the flattened 1st joint how- 

 ever bears more numerous fringed spines than is the case in 

 the preceding species ; the elongated 2nd joint ends obliquely 

 and bears 5 simple slender spines. The second antennce are 

 similar to those of the preceding species, but are more strongly 

 hooked, and are distinctly 3-jointed. In the foot-jaws of the 

 first pair the two joints are sub-equal in length, the basal one 

 being considerably the stoutest ; the 2nd joint at about two- 

 thirds of its length bears a curved fringed spine, much smaller 

 than the corresponding organ in D. hamiltoni, and distinctly 

 jointed on to a short stalk ; behind it, on the joint wliich 

 bears it, is a roughened tubercle ; the slender continuation of 

 this 2nd joint is provided with a finely-serrated fringe reach- 

 ing nearly to the end, which is strongly hooked. The foot- 

 jaics of the second pair are very stout, and in the males end in 

 a strong horny hook, which is brown-coloured, and so con- 

 trasts in a marked manner with the whitish-yellow colour of 

 the i-est of the body. 



All four pairs of feet are 2-branched. In the first pair both 

 branches are 2-jointed : the outer branch has the first joint 

 nearly as long as the inner branch ; its outer margin is dilated, 

 and ends in a stout spine ; the 2nd joint has 4 spines and 



