Mr. E. J. Mievs on neio Species of Crustacea. 219 



Halimus Hectori^ n. sp. Type, B.M. 



Moderately convex, broadest beliind, with the sides conver- 

 ging from the front of the branchial regions, obscurely tuber- 

 culated ; there are four low tubercles (two median and two 

 lateral) on the gastric, two in front of the branchial region, one 

 at some distance behind, and two smaller upon the sides of the 

 branchial region. The cardiac region is convex. The upper 

 orbital margin projects considerably over the base of the eyes. 

 There are four obtuse spines, of which two are larger, on the 

 hepatic, and about ten small tubercles on the pterygostomian 

 regions ; the spines of the rostrum are straight, scarcely at 

 all divergent. Penultimate joint of the ambulatory legs con- 

 siderably dilated and squarely truncate at its distal extremity. 

 Abdomen of male 6-jointed. 



Length rather more than 2 inches. 



Hah. New Zealand. 



A single, unfortunately mutilated, specimen has been pre- 

 sented by Dr. Hector to the British Museum. This species is 

 in many respects intermediate between the genera Acanthonyx 

 and Halimus ; but in the convergent sides of the carapace and 

 squarely truncate penultimate joints of the legs it has most 

 affinity with the latter genus. It is remarkable for the absence 

 of spines on the gastric, cardiac, and branchial regions. 



Under this generic name I have constituted two subgenera, 



Pakamithrax 



generic r 

 as follows : — 



1. Paramithrax. 



Anterior legs in the male enlarged ; hand compressed ; fin- 

 gers with a vacant space at base when closed ; wrist with two 

 longitudinal ridges, the outer usuallj'' oblique. 



This subgenus includes. the P. Peromi and P. Gaimardii of 

 Milne-Edwards, and the following species : — 



Paramithra-x harhicornis. B.M. 



Pisa harbicornis, Lati'. Encjcl. x. p. 141 (1825). 



Paramithrax harhicornis, M.-Edw. Hist. Nat. Crust, i. p. 324 (1837). 



The specimens of this species in the Britisli-Museum collec- 

 tion from New Zealand prove that the description of Latreille, 

 based on a specimen from Australia, refers to the young female. 



The males have the anterior legs greatly developed ; arm 

 with a series of strong spines above ; wrist with two ridges, 

 the inner divided into several lamellate or tuberculiform lobes, 

 the outer uninterrupted except at the base ; hands compressed. 



15* 



