178 ATTSTRALTAW MALACOSTEACA. 



Division C. Neither the abdominal swimmerets or the caudal 

 laminae membranaceous. 



332. Astacopsis Tasmanicus. 



Astacoides Tasmanicus, Erichson, 1. c. ; Von Martens, 1. c, 

 p. 618. 



A lateral keel on the carapace, having the same position as in 

 A. bicarinatus. Rostrum without teeth. Carpus with 6-7 small 

 spines on its inner border. Hand rounded on its outer border, 

 finely toothed on its inner. 



Tasmania (Schayer). 



333. Astacopsis austr alien sis. 



Astacus australiensis, Milne-Edwards, Hist. Nat. des Crust., 

 t. ii., p. 332, pi. xxiv., figs. 1-5 ; Heller, Reise der Novara, 

 Crust., p. 100. 



Carapace entirely smooth. Rostrum shorter than the peduncle 

 of the external antennae, narrowing gradually from its base, and 

 armed with two small lateral teeth near its point. Hands com- 

 pressed, smooth, and ornamented with a sharp more or less 

 denticulated crest on their upper border. Two sharp spines on 

 the internal border of the carpus. No spines in front of the 

 gastric region. Epistome very large, triangular and without 

 transverse groove. \_M.-JSdw.~] 



Australia. 



Genus Engjeus, Erichson. 



The species of this genus are distinguished from those of 

 Astacopsis only by having the abdomen small in proportion to 

 the thorax. The rami of the sixth pair of abdominal appen- 

 dages have each a longitudinal keel. The external antenna? 

 are short. 



334. Engaeus fossor. A.M. 



Engcsus fossor, Erichson, 1. c, p. 102, Von Martens, 1. c, 

 p. 618. 



Hand with a toothed ridge on both borders. 

 Tasmania (Schayer) ; Australia (Mus. Berlin). 



