ME. E. J. MIEES ON THE IDOTEIDiE. 03 



the peduncle of tlie anteuiife, which are about half as long as the 

 body ; flagellum shorter than the peduncle, 10-jointed, naked. Epi- 

 mera occupying only part of the margin of each thoracic segment. 

 Legs sparingly hirsute below. Length 0'86 inch, breadth 0'17, 

 ratio 5:1. 



New South Wales, Australia (Dana). 



"Were it not for the uniarticulate postabdomeu, I should con- 

 sider it identical with I. Peronii. 



Mr. S. Bate refers, Avithout any description, specimens from 

 Esquimalt Harbour, British Columbia, to this species ; it is 

 far more probable that they belong to Idotea oclwtensis or 1. 

 Whitei. 



Idotea longicaudata. 



Crabyzos longicaudatus, S. Bate, Proc. Zool, Soc. p. 504, pi. xU. fig. 7 

 (1863). 



The body is elongated and slender, smooth, with the sides 

 nearly parallel. The head is partially coalescent with the first 

 thoracic segment, and about equals it in length ; the dorsal sur- 

 face of the thoracic segments is nearly flat, while tlie margins 

 with the epimera stand nearly perpendicular to them ; the last 

 two segments are rather shorter than the preceding. The head 

 has its anterior margin excavated ; but the median part behind 

 the antennules is straight. The postabdomeu is as broad at base 

 as the posterior thoracic segments, with the sides at first nearly 

 parallel and afterwards divergent ; the distal extremity is acu- 

 minated, terminating in along cusp or point. Eyes small, round, 

 placed near the antero-lateral angles. Antennules slender, with 

 the basal joints not dilated. Antenna) nearly four times as long 

 as the antennules, but not reaching, when retracted, to the poste- 

 rior margin of the third thoracic segment ; the first two of the 

 peduncular joints are very short, the last three elongated and of 

 nearly equal length ; flagellum shorter than the peduncle, and 

 12-li-jointed. The legs are slender, feeble, and nearly naked, 

 but the first pair are more elongated and robust than the rest ; 

 the epimera or coxal joints are quite small, and, in a lateral view, 

 occupy only a very small ])art of the lateral margins ; the dactyli 

 of all are furnished with a small accessory claw. The opercular 

 valves do not reach beyond the beginning of the long terminal 

 cusp of the postabdomeu ; their terminal plate is longer than 

 broad, suboblong. Colour is said to have been apple-green. 



