FRESHWATER CRAYFISHES OF AUSTRALIA. 1G7 



The largest specimen measiu'es 6g inches. Specimens in J5i-iti,s!i 

 Mnsenm al)out 11 inclies. 



LocaVity. — Margaret lliver, Western Australia. 



CU.ERAPS QUADRICARINATUS. (Pls. XXIV. fig. 1 ; XXYIl. 



figs. 31-33.) 



(Von Martens, Monatsbericht Akad. Wiss. Berlin, 1868, p. 617.) 



Nomenclature : — 



Chcerai^s quadricariiiatus Von Mai-tens. 



Astaconephrofis alhertisii Nobili, Annnli del Museo Civico di 

 Genova, xl. 1899 (1901), p. 244. 



The keels of the rostrum are well marked and continued far 

 backvvards on to the carapace ; the rostrum ends in a, sharp spine, 

 and thei-e are three sharp lateral sei'rations on each side of the 

 rostrum. 



The lateral keels on the carapace are well marked and sharp ; 

 they are arched outwards and end anteriorly in a sharp spine. 

 There is no median keel. 



The carapace and branchiostegites ai'e smooth, except for the 

 presence of three sharp spines laterally on each branchiostegite 

 just po-sterior to the cervical suture. 



The first maxilla has the endopodite consisting of a base and 

 a fairly distinct fiagellum jointed on to it. 



The third maxillipede has the third and fourth segments 

 sparsely fringed on the inner and outer face with bristles 

 (PI. XXVIT. fig- 32}. 



The great cheliped is veiy slender and small, with slender 

 carpus ; the carpus is smooth excej»t for a fine seiTation on innei' 

 border, and there is no carpet of downy hairs upon it. A pad of 

 fine hairs is, however, present on the inner face of the meropodite 

 between the spines. The row of tubei'cles upon the uppei- ridge 

 of the ischiopodite is represented by a single spine. 



The succeeding two chelate legs are i^rovided with a few hairs 

 on the terminal segment. The two posterior non-chelate legs 

 have a fringe of hairs on the last two segments. 



The telson is without median spines. 



Length about 4 inches. 



Locality. — From Cape York, X. Aiistvalia (To-^ Martevs\ ■^x\(\ 

 Katau, Xew Guinea {Noh'ili). Also from Aru Islands (\ar. 

 aruanus) and Mainikion, Bale Etna ami Sabang, Xew Guinea 

 (var. lorentzi) {Roux). 



Bemarks. — Through the kindness of Dr. Gestro, of Genoa, 

 I have been able to examine the single New Guinea specimen 

 described by the late Dr. Nobili. In the characters of the gills, 

 coxopoditic seta?, mouth-parts, antennal scale, interantennal spine, 

 sternal keel, and general structural features it falls clearly within 

 the diagnosis of our genus Chteraps. Dr. Nobili, in regarding it 

 as allied to the New Zealand Paranephrojjs, was apparently led 

 astray by not having ever seen any of the Western Australian 



