rUKSUWATKU CIlAyriSIlKS OF AUSTRALIA. Kll 



branchiostegites of A. serratus are replaced by Ijliinfc, often tiniiid 

 tubercles. 



The interaiiteiiiial spine, tlie margins of tlie upper lip, and the 

 antennal sciiles approach the condition found in A. frmiklinii, 

 and the stei'nal keel is sharper than in A . serratas. 



The first abdominal segment has only one lateral spjne (jn tvyq 

 out of the three specimens this spine was abfjeiit on (t^je sic^e). 

 T^ie second jibdominjil segment has three later.'j,! spines on each 

 side and one dorso-lateral ; the dorsal spine present in A. serrfUt^s 

 is replaced by a very large tumid tubercle which is joirjed by a 

 ridge to its fellow of the opposite side. 



The succeeding three segments haye qne tq thj^'ee lateral spii^e^ 

 on each side and a dorso-lateral, the dor!$al spine qf A. serratus 

 being replaced by a tumid tubercle. Tbe sixth abdqminal segmentj 

 telson, and uropods are provided with sever.1,1 .'jnitill spines. The 

 chela is less elongated ai|d mope stoijtly l^uilt than jn A. serratus, 

 and very often carries spines or tubercles on the dactylopodite 

 and on the surfaces of the carpopodite which ;j,re iiqn-tuberculou^ 

 in A. serratus. 



Tlie largest specimen was 10 inches lp"g. 



Locality. — Moe lliver, GJppsland. 'j.^hj.-ee .'jpecjmerjs cQllectp4 

 by Mr. Keishaw, 



Local Variety .—Tlie Small (Jippslaud (^'ray/ish. (PI. XX.) 



Several rather small specimens from the Narrac^n lljver and i^ 

 number of other small Gippslarjd strearnsi (lai-gest specimen 

 5 inches in length) agree with A.k&rshawi in the broij.d truncq-teij 

 form of the rostrun), sl)arpr)es6i of sternal keel^ aiid replacpment 

 of spines by blunted tul)ercles, thu3 differing in diag|:jostiu 

 characters frqm the smaller S])ecjmens of A. sefratu^ from the 

 Victorian Highlands. Except in poiijt of yize, it is impossible tq 

 separate these si)ecimei>s from the large A. kershawi, of ^yhich 

 they are proljably only the not fully grown individuals. 



Jiemarlcs on the above s/J>ectes.— There can be no dqubt tha^i 

 this Gippsland Crayfi.sh js sipecificaljy distinct ffom A. serfatus. 

 It is of considerable interest to observe that \\j approaches in 

 many respects the Tagmani^-n Astacopsis with which it is 

 geographically related, being separated by the cqmpar4,tively 

 modern Bass's Straits. 



Genus Parach^raps, gen. nov. 



Arthrobraijch qf last leg but one rudimentary, consisting qf n. 

 stout fleshy pedunple tipppd wi]bh a fe^v mipute fijaments whic)i 

 end in long curved hooks (PI. XXVI. figs. 16, 18). Ala on 

 anterior podobranchs js broad and conspicuous, and carries small 

 filaments. The majority of gill-filaments attached to the stem'' qf 

 all the gills are furnished with long recurved hooks at their ends. 

 The other filaments are frequ^ntly pointed at the end. 



The hooked seta? on cqxopodites ij,nd qn gill -stems are very 

 sharply recurved (fig. 17), 



Proc. Zool. Soc— 1912, No. XL 1^ 



