Mr. E. J. Micrs un new Species of Crustacea. 219 



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



Moderately convex, broadest behind, 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 wJiich 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 Acantlionyx 

 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. 



Paramithrax. 



Under this generic name I have constituted two subgenera, 

 as follows : — 



1. Paramithrax. 



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

 gers with a vacant s])ace at base wlien closed ; wrist with two 

 longitudinal ridges, the outer usually oblique. 



This subgenus includes tlie P. Peronii and P. Gaimarcln of 

 Milne-Edwards, and the following species : — 



Paramithrax harhicornis. B.M. 



Pirn barhieoriiia, Latr. Encycl. x. p. 141 OS--^)- 



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



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

 tion from New Zealand prove that the description of Latreille, 

 based on a s])ecinien 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 uninterrui)ted except at the base ; hands compres.scd, 



15* 



