Thomson. — On Parasitic Copepoda. 357 



stylets rather large, lamellai' or little oblong; setae three, 

 plumose." 



It is impossible from sucli a description to recognize the 

 species referred to. I regret also, in absence of Dana's work, 

 that I am unable to give exact references of this species. 

 The same remark applies to Pamlarus brevicaudis and Specil-^ 

 ligus ciirticandis, referred to further on. 



Genus Dinematura, Burmeister [Dincmoura, Latreille). 



1. Dijiematura affi.nis, M.-Edw. ("Hist. Nat. de Crus- 

 tacees," vol. iii., p. 465 ; pi. 38, figs. 15-18). 



This species is briefly described by M. -Edwards as fol- 

 lows : — 



'•■ Species extremely like the preceding (D. alata), but 

 having the posterior margin of the elytroid plates sinuous, the 

 terminal lobes of the thorax somewhat narrowed and without 

 the horny tooth at the end, and the abdominal appendages of 

 the female large, oval, as long as the abdomen itself, but not 

 exceeding the thorax. From New Zealand seas." 



I have not met with this species, which is figured by 

 M. -Edwards, and is very different in appearance from the fol- 

 lowing three species described by me. 



2. Dinematura hamiltoni, n. sp. Plate XXV., fig. 1, a-j. 

 Male. — Whole body somewhat elevated dorsally. Cephalo- 



thorax rather square in front, nearly half as long as body, a 

 little broader than long, rounded behind and ending in rather 

 obtuse angles. Frontal lamina extending across about two- 

 thirds of the cephalothorax. Penultimate segment of thorax 

 short, with rounded lateral lobes. Last thoracic segment 

 nearly three times as long as broad, with wide lateral wings. 

 Genital segment short. Abdomen nearly square, only one 

 joint apparent from above. Caudal lamelhe elongate. Fourth 

 pair of feet 2-branched, each branch 2-jointed, terminal joint 

 furnished with short, simple, soft spines. 



Length of body, 9mm. 



Female. — Whole body rather flattened. Cephalothorax 

 two-thirds as long as body. Dorsal lamellai of penultimate 

 thoracic segment only two-thirds as long as hind portion of 

 body ; ultimate thoracic segment relatively shorter than in 

 male. Fourth pair of feet 2-branched, each branch consisting 

 of two rather large rounded lamellae. 



Length of body, 12-15nnn. ; length of oviferous tubes, 

 30-35mm. 



The antennce of the first pair are normally formed, the 1st 

 broad flat joint being furnished with numerous stout fringed 

 spines ; the 2nd johit ends in several smaller spines and one 

 longish seta. The antennce of the second pair are apparently 



