236 Transactions. — Zoology'. 



margins. The first gnathopoda of the male have the joints rather short 

 and dilated on their lower margins ; the propodos is about as broad as 

 long, rounded on both margins, and with the palm nearly transverse. In 

 the female the same is more slender, and the joints longer in proportion to 

 then- breadth ; the propodos sub-quadrate, with the palm quite transverse ; 

 and only the carpos has the rounded dilatation. The second gnathopoda 

 of the male have a large, broadly-ovate propodos, narrowing to the 

 extremity. It bears a double row of stiff spine-like teeth along the palm, 

 which extends very obliquely more than half-way along the inferior margin. 

 In the female, on the other hand, this limb is so much reduced anteriorly 

 as to suggest a close approximation to Orchestia ; the meros, carpos, and 

 propodos have their inferior margins dilated into rounded plates ; while the 

 latter bears a minute dactylos, extending only about half-Avay across it, and 

 not quite at its extremity. The pereiopoda increase in length posteriorly, 

 the last pair being considerably the longest. Length f inch. 



Log. Numerous specimens of this species were sent me from Wel- 

 lington by Mr. J. C. Gully, who obtained them in a small stream into 

 which several drains ran. 



Genus Corophium, Latr. 



Latr. Gen. Crust., i., p. 58. 

 Brit. Mus. Cat. Amphip. Crust., p. 279. 



1. COKOPHIUM EXCAVATUM, U. Sp. PI. xh\, figS. 1-8. 



Cephalon laterally produced between the bases of the antennae into small 

 obtuse lobes, on which the small rounded eyes are placed ; seen from above 

 the front margin is nearly straight, and is only pointed (not rostrate) be- 

 tween the bases of the anterior antennae. Antennae subequal in length, 

 more than one-third as long as the body : anterior pair slender ; 1st and 

 2nd joints of peduncle long, subequal ; 3rd joint very short ; flagellum 

 10-jointed, as long as base: inferior pair very stout, pediform; flagellum 

 very short, 6-jointed : both pairs of antennae sparingly furnished with setae. 

 First pair of gnathopoda rather small ; ischium and meros very short, the 

 former with a long tuft of setae ; carpus elongated, thickly fringed with hairs 

 on its inferior margin ; propodos rather shorter than carpus, slightly dis- 

 tended proximally, furnished with a tuft of setae on its upper margin and 

 another at the hinge of the dactylos, palm transverse, with a fringe of fine 

 setae.; dactylos slightly curved, impinging closely on the palm. Second 

 pair of gnathopoda longer than first, joints rather slender ; meros produced 

 into a scoop-like process, fringed on each margin with long setae, and into 

 which the carpus lies closely when the limb is folded ; carpus elongated, 

 rather widest at its distal end, densely fringed with long setae along its in- 

 ferior margin ; propodos as long as carpus, sides nearly parallel, produced 



