AUSTRALIAN MALACOSTKACA. 183 



311. Oaridina truncifrons. 



Caridina truncifrons, Spence Bate, P. Z. S., 1863, p. 499, 

 pi. xl., fig. 2. 



Rostrum deeper than the cephalon, the extremity being the 

 deepest part ; the anterior margin slightly excavate, and armed 

 with nine small teeth. Rostrum also furnished with a tooth 

 upon the dorsal surface immediately above the eyes. Abdomen 

 robust and but slightly curved. Internal antenna? reaching 

 beyond the extremity of the rostrum. External antennae having 

 the scale acuminate, sub-apically tipped with a tooth, and reach- 

 ing to the extremity of the rostrum. Three last pairs of 

 ambulatory legs longer and rather more slender than the 

 preceding, armed on the posterior margin with five or six equi- 

 distant solitary spines. Telson terminating obtusely, armed 

 with two strong spines at the apex, and sub-apically furnished 

 with a short cilium. [#.i?.] 



G-ulf of St. Vincent, 4^ fathoms. 



342. Caridina cincinnuli. 



Caridina cincinnuli, Spence Bate, 1. c, p. 500, pi. xl., fig. 3. 



Back of carapace smooth. Rostrum only carinated below, 

 armed with six teeth. Pleon smooth ; third segment slightly 

 gibbose, with a small tuft of hair on each side of the central line. 

 Internal antenna? with the primary appendage but half the 

 length of the secondary. External antenna? having the basal 

 scale reaching quite to the extremity of the rostrum, rounded at 

 the apex, and furnished with a sharp tooth one-third from the 

 extremity ; the flagellum more than half the length of the 

 animal. Mandible with a short anteriorly directed process. 

 Telson terminating in two or three small spines. [S. B.~\ 



Grulf of St. Vincent, 4i fathoms. 



343. Caridina tenuirostris. 



Caridina tenuirostris, Spence Bate, 1. c, p. 501, pi. xl, fig. 4. 



Rostrum long, slender, and armed with three teeth upon the 

 upper surface near the base, and one upon the under surface 

 near the apex. Pleon gibbous at the third segment. Internal 



