17G AUSTRALIAN MALACOSTBACA. 



Rostrum rather long, nearly entire, apex obtuse, and either 

 side having an obtuse tooth, a little shorter than base of outer 

 antenna 1 . Carapace obsoletely armed on either side below base 

 of beak. Segments of abdomen more or less distinctly uni- 

 tuberculate, the tubercles on younger individuals obsolescent ; 

 second segment with short spines near lateral margin ; caudal 

 segment a little oblong. Anterior feet equal, stout, carpus very 

 prominently three-spinous. Hand above and below with a pro- 

 minent margin, which is short dentate, surface nearly smooth, 

 naked. Anterior median process of epistome triangular, very 

 narrow and elongate. Length 5 in. [Dana.'] 



New South Wales ? 



Probably identical with the following. 



327. Astacopsis Franklinii. 



Astacopsis Franklinii, Gray, 1. c, p. 409, pi. iii., fig. 1. 



Carapace convex on the sides, rather rugose on the sides 

 behind, the front only slightly produced and edged with a toothed 

 raised margin not reaching beyond- the front raised margin of 

 the lower orbit, and with a very short ridge at the middle of 

 each orbit behind ; the hands compressed, rather rugose, edge 

 thick and toothed ; wrist with four or five conical spines on the 

 inner side, the front the largest; the central caudal lobe broad, 

 continuous, calcareous to the tip ; lateral lobes with a very 

 slight central keel ; the sides of the second abdominal rings 

 spinose. [Gray.] 



Tasmania. 



Section B. All the lamina? of the tail membranaceous in the 

 hinder half. Abdominal swimmerets not membranaceous. 

 [Sub-genus Chceraps, Erichson.] 



328. Astacopsis quinque-carinatus. 



Astacus quinque-carinatus, G-ray, 1. c, p. 410, pi. iii., fig. 3. 



Chaeraps quinque-carinatus, Von Martens, 1. c, p. GIG. 



Carapace smooth, rather convex, and with three keels above, 

 the beak longly produced, ending in a spine, simple on the side, 

 and produced into a keel on each side behind ; the central caudal 

 lobe rather narrow, indistinctly divided in half, and like the other 

 lobes flexile at the end, the lateral lobes with a central keel 



