34 DE. G. S. BEADY ON THE 



Male. — Abdomen composed of four segments (fig. 14), the first very short, second 

 twice as long, third and fourth rather shorter ; caudal stylets rather longer than the 

 preceding segment. Antennules more nodose than in the female owing to the distal 

 dilatation of many of the joints (figs. 12, 13), some of which are more or less distinctly 

 coalescent. The fifth foot of the right side is longer than that of the left (fig. 15) ; 

 the inner margins of the first and second joints have large lobose protuberances, and 

 the last joint is bent upon itself at a right angle, ending in a sharp point ; on the left 

 side the first joint is broad and quadrangular and has a long seta attached to its 

 angulated outer margin ; second joint rather longer and narrower, third dilated at the 

 base and bearing on the inner margin of the narrowed distal extremity three small 

 setiform laminae. 



Hab. Plentiful in surface gatherings from Otago Harbour, Port Chalmers, Bay of 

 Islands, and Napier ; also in the net at a depth of 7 fathoms off Gisborne. These 

 gatherings consisted almost entirely of females, males being extremely rare; almost 

 all had attached spermatophores. 



A form described in the ' Challenger ' Report under the name of Acartia denticornis 

 is very nearly allied to this species, but the antennules of A. ensifera possess no 

 well-marked teeth, though these are constantly present in both sexes of A. denticornis. 

 The antennules in A. denticornis are fully as long as the animal itself, while in 

 A. ensifera they reach scarcely further than the extremity of the cephalothorax. The 

 peculiar enlargement of the first segment of the abdomen in the female A. ensifera is 

 likewise characteristic. 



Genus Temora Baird. 



1. Temora. tenuicauda, sp. nov. (Plate IX. figs. 16-23.) 



Female. — Cephalothorax robust, width great in proportion to the length (fig. 16), 

 broadly rounded in front, abruptly narrowed behind ; angles of the posterior extremity 

 rounded off, not at all produced or spinous. Abdomen short, four-jointed, first 

 segment about twice as long as either of the following three, and in the adult having 

 a pouch-like process on the ventral surface ; caudal stylets cylindrical, extremely long 

 and slender, from eight to ten times as long as broad, bearing one small seta on the 

 outer margin beyond the middle, and three at the apex, one of which is spathulate at 

 its base and nearly as wide as the stylet itself (fig. 18). Antennules sparingly clothed 

 with extremely short setse, 24-jointed, slender, about as long as the cephalothorax 

 (figs. 16, 17). Feet of the fifth pair (fig. 19) simple, rudimentary, three-jointed, the 

 last joint nearly twice as long as either of the preceding two and ending in three 

 small claw-like setse. Terminal spines of the outer branch of the swimming-feet 

 (fig. 20) well-developed and stout, the principal one strongly serrated with about 

 fourteen teeth on its inner margin. Length T75 millim. 



