lo4 MR. G;':urFREY sjutii ox the 



Iir. Systematic Account of the Generco and Species of 

 A usiralian Parastacidpe. 



Genus AsTACorsis Huxley (P. Z. 8. 1878, p. 76-i). 



Arthrobraiieh of last leg but one not I'udimentarv or even much 

 reduced. Ala of podobranchs small and inconspicuous. Short 

 and stout hooks only present at the end of a few branchial lila- 

 ments fringing the stem of podobranchs (Pi. XXYI. fig. 10), 

 being absent in all other gills. 



Hooked seta^ on coxopodites and on gill-stems not very sharply 

 recurved (PI. XXVI. fig. 11). 



Mandibles with three prominent teeth and smooth lower 

 ridge (PI. XXV. fig. 6). 



First maxilla with endopodite consisting of base and distinct 

 flagellum united on to it (PI. XXV. fig. 5; PI. XXVI. 

 tig"y 9). 



Second . maxillipede with penultimate segment beaiing an 

 upper lobe, which projects forwards as far as terminal segment 

 (PI. XX \'.' fig. 2). 



Third maxillipede with serial row of biistles on outer face of 

 third and fourth segments, and a sparse fringe of bristles on 

 inner face. Exopodite does not equal third segment in length 

 (PI. XXV. fig. 1). 



Great chela with the carpus rather short and stout ; much 

 tuberculated, with a row of tubercles on its outer border as well 

 as on the inner (Pis. XIV.-XX.). 



Succeeding legs with terminal and subterminal joints well 

 provided with pencils of bristles. Opening of vas deferens 

 sitiiated on a short simple papilla. 



The lateral keels of rostrum are spiny or tuberculated. Latenil 

 carina on carapace is also spiny or tuberculated. Carapace and 

 branchiostegites tuberculated or spiny. The sternal keel is 

 depressed and blunt (PI. XXVI. fig. 14). 



The first abdominal segment carries lateral spines ; the suc- 

 ceeding segments are spiny, tuberculated, or setose. 



The membranous portion of telsoii and uropods is short 

 compared to the upper calcified jjortion, and the median spine on 

 the endopodites of the uropods is, in consequence, situated 

 distally. 



ASTACOPSIS FRANKLTNII. (Pls. XIV., XXV., k XXVI., figs. 7-1 1 .) 

 The Large Tasmanian Crayfish. 



(Gray, Eyre's Journals of Expeditions of Discovery into Central 

 Australia, i. p. 409, 1845.) 



The rostrum is rather broad and tumid, and ends in a short 

 median spine; the lateral keels are rounded, and each keel 

 carries four or five blunt spines or tubercles. 



