AUSTRALIAN MALACOSTRACA. 201 



the second joint. Abdomen with well-marked carina on the 

 fourth, fifth, and sixth segments ; the first, second, fourth and 

 fifth segments with a notch on each side posteriorly. Seventh 

 segment strongly grooved on the middle dorsal line, its apex 

 spiniform, its lateral margin devoid of spines. Appendages of 

 sixth segment rounded distally, the inner slightly more pointed. 

 Length of largest specimen 9 in. 



Port Jackson ; Port Darwin (Alex. Morton). 



This is the common edible prawn of Sydney, Newcastle, etc. 



375. Penseus Macleayi. 



Penceus Macleayi, Haswell, 1. c, p. 40. 



Rostrum extending nearly as far forward as the end of the 

 antennary scale, very slender and styliform near the apex, which 

 is recurved ; armed with five or six teeth above, of which the fifth 

 is separated from the fourth by an interval greater than that 

 separating the others ; unarmed below ; produced behind into a 

 low carina, which broadens out and becomes lost before attaining 

 the posterior third of the carapace ; a lateral groove at the side of 

 the rostrum and the anterior part of the carapace. G-astro-hepatie 

 sulcus deep. Supra-orbital spine absent ; antennary and hepatic 

 spines present. Filaments of antennules sub-equal, scarcely 

 equal in length to the two last joints of the peduncle. External 

 maxillipedes slender, hairy palp extending as far as the middle 

 of the third articulation of the endopodite. First pair of ambu- 

 latory legs as long as the antennary scale, very hairy internally ; 

 second and third progressively longer ; fourth shorter than third; 

 fifth the longest of all, and very slender. First and second and 

 sometimes third pairs each with a spine at the base of the second 

 joint. Abdomen having the fourth, fifth, and sixth segments 

 dorsally carinated ; carina ending in a small spine at the posterior 

 border of the sixth segment. Terminal segment longitudinally 

 grooved in the middle dorsal line, ending in a spiniform apex, 

 ciliated laterally, and armed on each side near the extremity with 

 a strong spine, with two or three weaker spines immediately 

 anterior to it. Length 5 in. 



Port Jackson. 



