AT7STBAI/IAN MAI/ACOSTBACA. 203 



377. Penseus Mastersii. 



Pencsus Mastersii, Haswell, 1. c, p. 42. 



Rostrum reaching nearly as far as the end of the antennary 

 scale, slender, nearly straight ; armed above with eight or nine 

 teeth, of which the last is separated by a wide interval from the 

 penultimate ; unarmed below ; continued back into a non-sulcate 

 carina which does not reach to the posterior margin. A slight 

 lateral groove at the side of the rostrum, not continued backwards. 

 Carapace smooth ; supra-orbital spine rudimentary ; hepatic and 

 antennary spines present, acute ; gastro-hepatic sulcus deep ; 

 cervical suture well-marked in its anterior half. Eyes large ; 

 flagella of antennules equal in length to the two last segments of 

 the peduncle. External maxillipedes rather slender; palp 

 extending to the distal end of the ante-penultimate joint of the 

 endopodite. Eirst three pairs of legs progressively increasing 

 in length from before backwards ; fourth much shorter than 

 third ; fifth of about the same length as the latter ; first 

 three pairs with a spine on the under surface of their second 

 joint. Fourth, fifth, and sixth segments of abdomen carinated, 

 the carina on the sixth segment ending in a small spine ; the 

 posterior border of the first, second, fourth, and fifth with a 

 notch on each side — shallow and wide on the first and second, 

 deeper and narrower on the fourth and fifth. Last abdominal 

 segment mesially grooved, and with a slight lateral groove near 

 each external border, apex pointed, but not markedly spiniform ; 

 lateral margin devoid of spines. Length 3| in. 



Port Darwin (Macleay Museum). 



378. Penseus Novae-G-uinese. 



PencBus Novce- Ghiimew, Haswell, 1. c., p. 43. 



Rostrum rather short, not quite reaching to the end of the 

 antennary scale ; straight, sub-acute, armed above with six small 

 teeth ; unarmed below. No marked dorsal carina, nor longitu- 

 dinal sulci on the carapace. Surface of carapace pilose ; gastro- 

 hepatic sulcus moderately deep ; hepatic and supra-orbital spines 

 absent. Eyes large. External maxillipedes hairy, palp extend- 

 ing to the distal end of the second joint. Third pair of 

 ambulatory legs longer than second ; fourth shorter than third ; 

 fifth about equalling the latter in length. Under surfaces of 

 second and third pairs devoid of spines. Abdomen pilose, a 



