192 Ti-ayisactions . — Zoology. 



the Eev. T. E. E. Stebbing ; but I have never collected any- 

 thing like it in New Zealand, and, so far as I know, it has not 

 been taken by any other New Zealand collector. 



Idotea festiva. 



Idotca festiva, Chilton, " N.Z. Jour, of Science," vol. ii., 

 p. 320 (1884) ; " Ann. and Mag. Nat. Hist.," ser. v., vol. xv., 

 p. 123, pi. 5a, figs. 1-3 (1885). 



Idotea festiva, Thomson and Chilton, "Tra.ns. N.Z. Inst.," 

 xviii., p. 156 (1886). 



Body not very convex, oblong-oval ; length about two-and- 

 a-half times the greatest breadth. Head transverse, produced 

 upwards and forwards into a rounded prominence divided into 

 two lobes by a median depression, which is continued nearly 

 to the posterior margin ; remainder of the head variously 

 sculptured, and with two raised ridges towards the lateral 

 borders. First five segments of the thorax of nearly equal 

 length, sixth and seventh shorter, seventh shorter than the 

 sixth. First segment produced into two rounded antero- 

 lateral lobes, which reach to the eyes. Two raised ridges, one 

 near each lateral border, run throughout the whole length of 

 the thorax, and extend nearly to the end of the postabdomen. 

 There is also a less perfect median ridge formed by the 

 posterior portion of each segment being raised into two short 

 converging ridges, like the letter V. This ridge is well marked 

 in the postabdomen, and extends right to the end. Between 

 the lateral ridges and the median ridge, but nearer to the 

 former, are various sculptured markings. Postabdomen about 

 as long as the five preceding segments of the thorax, composed 

 of three distinct segments, the first two short, the third with 

 the lateral sutures of another segment. Postabdomen gradu- 

 ally narrowing until about one-third of its length from the 

 end, when it suddenly contracts and converges with slightly 

 sinuous margins to the extremity, which is subacute. Eyes 

 small, situated on the lateral margin of the head at the postero- 

 lateral angle. Antennules'-' reaching nearly to the end of the 

 third segment of the peduncle of the antennae ; ■■'' penultimate 

 segment expanding distally, terminal segment very small. 

 Antennge''' as long as the head and first two segments of thorax ; 

 last segment of peduncle longer than the preceding, but slightly 

 shorter than the flagellum, which is composed (in the single 

 specimen) of seven joints, of wliicli the first is considerably 

 longer than any of the succeeding. Epimera of only the last 

 three segments of thorax visible in dorsal view ; in side view 

 they are all rectangular, those of second and third segments 



* These words were by an error interchanged in the original 

 description. 



