FKKSliWATiill CIIA YKJSIIKS OF ArsiKAJ.IA. 1 'tS 



(^11 tlie carapace iinnieiliately lateral to the ])0,sterior oiiter 

 l)order of the ro.stral carina, a tubercle, often double, is present, 

 and posterioily in a line with this tubercle is another rounded 

 tubercle, and behind this again a rounded boss. The disposition 

 of these tubercles is subject to some vaiiation. Laterally 

 and anteriorly, the ceplialothorax has a few blunt spines and 

 tubercles, and there are numerous blunt tubercles on the 

 branchiostegites. 



Ventrally the interantennal sj)ine is rather long and narrow, 

 and not produced laterally at the base. The chitinous margin 

 of upper lip has large lateral arches and a small median arch 

 (PI. XXVI. fig. 7). 



1'lie inner border of the antenna] scale widens rather suddenly 

 at the base of the terminal spine (PI. XXVI. fig. 8). 



The sternal keel is of the usual Astacopsls type, but is sharf)or 

 than in succeeding species. 



Tiie first abdominal segment bears laterally a prominent 

 forwardly directed s[)ine. 



The sec(md abdominal segment has a vaiying numl)er (4-7) 

 of small sharp spines on each latei-al border. 



The succeeding abdominal segments are smooth, l)ut laterally 

 each .segment is produced into a small sharp spine, often witli 

 another smaller spine just alcove it. 



The exopodite of the nropod has a row of teeth between 

 the hanl and membranous portions, which graduates internally 

 into a row of bristles. 'J'he endopodite has a small spine close to 

 the distal border in the middle line. 



The telson has two lateral serrations, l)ut is otherwise smooth. 



The great chela has the pincer studded with tubercles and a few- 

 brushes of setse. Two tubercles in the pincer, one on the upper 

 or outer and one on the inner pincer, are greatly enlarged, 

 especially in the larger specimens. The inner ei\^Q of the carpo- 

 ])odite has thi-ee or, at most, four serrations. The surface of the 

 carpopodite is not greatly pitteil. 



The two anterior walking legs have only a few spines, but 

 numerous brushes of bristles. The two posterior legs have more 

 niiraei'ous spines, which are not very long or conspicuous. 



The colour is uniform dark green. 



The largest specimen obtained by me weighed just inider 

 eight pounds, and measured 16 inches from rostrum to telson. 

 Small specimens less than 8 inches are very rarely obtained, and 

 have not been seen by me. 



Localities. — Several specimens were taken by me from the 

 Brid and Muddy Creek, Bridport, Tasmania — tlie latter stream 

 being a very small muddy i-ivulet. They are also reported from 

 numerous streams and I'ivers along the north coast, and fi-om the 

 (lordon lliver on the west coast, but they are unknown from the 

 south, east, or central districts of Tasmania. 



