AUSTRALIAN MALACOSTBACA. 175 



single one on the internal. Following pairs of thoracic limhs 

 with scattered spines. Segments of the abdomen with four to 

 ten large conical acute spines, except the sixth which usually 

 has about a dozen smaller spines. Telson usually with about 

 eighteen small spines, sometimes without spines. Appendages 

 of sixth segment usually armed with about a dozen small spines. 

 Length as much as 20 in. 



Murray and its tributaries ; creeks at Brisbane Water ; 

 Richmond River ? Mount Wilson. 



This species presents considerable variations in the number 

 and acuteness of the tubercles, and in the length of the rostrum. 

 The specimens from Mount Wilson differ from those from the 

 Murrumbidgee in having the apical spine of the rostrum very 

 short, the tubercles of the carapace blunt, and the tubercles of 

 the abdomen small, the inner row being altogether rudimentary ; 

 the colour of this variety is deep red, with bluish shades on the 

 sides of the carapace and legs, as in Shaw's figure. 



325. Astacopsis plebejus. 



Astacoides plebejus, Hess, Archiv. fiir Nat., xxxi., p. 164, 

 pi. vii., fig. 17 (1865) ; Von Martens, 1. c, p. 616 (1868). 



Carapace almost smooth, with impressed points ; the triangular 

 rostrum bent downwards, and ending in an acute apex ; at its 

 base on both sides is an elevation. First pair of limbs long and 

 strong, arm long, trigonal, carpus short, with a tooth which is 

 bent forwards on the inner side ; hand comparatively large, 

 toothed on the lower lateral border ; inner border of mobile 

 finger with a tubercle in the middle, blunt at the end ; mobile 

 finger acute, somewhat arched, also with a tubercle in the middle 

 of the inner border. Telson with a tooth in the middle of each 

 side, hairy at the extremity. Rami of the sixth pair of abdominal 

 appendages rather shorter than the telson, also fringed with 

 hairs ; the outer with a tooth only on the outer side, the inner 

 with one above in the middle. [Hess.] 



Sydney (Mus. G-ottingen). 



326. Astacopsis nobilis. 



Astacoides nobilis, Dana, U. S. Explor. Exped., Crust., i., 

 p. 526, pi. xxxiii., fig. 3 ; Heller, Reise der " Novara," Crust, 

 p. 100 ; Yon Martens, 1. c, p. 616. 



