132 Proceedings of the Royal Society of Victoria. 



basos proper, is clothed with fine setae, and beyond this, and ex- 

 tending to the extremity, are long pectinated spines pointing 

 distally on the lateral inner surface ; between the basos proper 

 and the free extremity, are three equi-distant "coupling spines." 

 The ischios is short, transverse, and bears two or three setae 

 at the inner distal angle. The meros is subtriangular, the 

 outer pointed distal extremity bears a few long curved setae 

 pointing distally, and the inner margin is convex, with five 

 or six long straight setae. The carpus is somewhat sunk in the 

 meros, narrowed at the base, widens distally, and has the end 

 truncate ; the inner and outer margins are both convex, the 

 former bears one or two curved setae, and the latter is densely 

 fringed, from end to end, with long outwardly directed setse. 

 The propodos is oblong, the outer margin sparsely setose, and 

 the inner densely fringed with long setae. The dactylos is of the 

 same length as the propodos, but much narrower, bluntly pointed, 

 and incurved. The outer convex margin is free from setfe, and 

 the inner concave margin has a fringe of long setae, and from 

 the extremity arise about five long setae, of similar kind and 

 length to those of the inner margin. 



First Appendage of Pereion. — There are two forms of the first 

 appendage of the pereion found in adult males (vide ante), 

 described hereunder as Normal and Hymeneal. 



Normal forin of pereiopod of male and female. — The normal 

 form of the first pereiopod of the male is similar to that of the 

 female, so that Fig. 9, drawn from the inner surface of an adult 

 male, will illustrate both male and female. The basos and ischios 

 combined measures slightly longer than the next three succeeding 

 joints, the basos being somewhat the longer of the two. It is 

 narrow at its articulation with the coxa, gradually widening to 

 the proportion of two and a half times longer than wide, and 

 again constricting distally; on the inner surface, near the distal 

 margin, is a small tuft of long setje ; the anti^-ior margin is 

 sparsely setose. The ischios is of the same shape as the basos, 

 but somewhat shorter and the anterior is sparsely setose. The 

 meros is half the length of the ischios, and subtriangular in 

 outline. Tiie anterior margin is produced into a pointed projec- 

 tion, from the extremity of which arises a tuft of long spiniform 

 setae ; the posterior margin is straight and sparsely setose ; and 



