583 



orbicular, with dark red pigment. Superior antennae in female not nearlv 

 attaining half the length of the body, 1st joint of the peduncle much tin- 

 largest, 3rd scarcely half as long as the 2nd, nagellum not exceeding the 

 peduncle in length, and composed of about 15 articulations, very sharply 

 marked of from each other, and having on both edges a small recurved bristle. 

 Inferior antennae somewhat longer than the superior, and rather strongly 

 built, with the flagellum exceeding half the length of the peduncle and 

 unusually thick, being composed of about 10 articulations. Both pairs of 

 antennae in male considerably more elongated than in female, though otherwise 

 of a similar structure. Anterior gnathopoda exactly alike in the two sexes, 

 carpus rather short, triangular, propodos about twice its length and oblong 

 oval in form, with the palm rather short. Posterior gnathopoda in female 

 considerably stronger than the anterior, with the propodos rather large and 

 broad, oval quadrangular in form, palm nearly transverse and denned below 

 by a distinct angle, dactylus strong and, like that of the anterior ones, 

 minutely denticulate inside; those in male still more powerfully developed, 

 having the propodos extremely large and expanded, with the palm somewhat 

 flexuous, and denned below by a distinctly projecting angle. Anterior pairs 

 of pereiopoda with the basal joint oval subfusiform in outline; the 3 posterior 

 pairs successively increasing in length, basal joint oval in form, that of the 

 antepenultimate pair somewhat shorter, but scarcely broader than that of the 

 last 2 pairs, propodal joint considerably expanded at the end, exhibiting a 

 distinct palm armed with 3 strong spines, the outmost of which is much curved 

 and unguiform. Last pair of uropoda with the rami subequal in size, the 

 outer one armed with 2 very strong recurved hooks, the inner one with 

 several slender bristles at the obtusely truncated tip. Telson, as seen from 

 above, subtriangular in shape, outer part rapidly tapering, and terminating 

 in 2 juxtaposed, very strong, hooked projections. Colour, according to Mr. 

 Stebbing, a bright yellowish green, with sparse but conspicuous black dots. 

 Length of adult female mm, of male 7 mm. 



Remarks. There cannot, in my opinion, be any doubt, that the 



two forms described by Sp. Bate as Pleonexes (Ampliiflioc) gammaroides and 

 'Sunamphifhoe liamulus are only the male and the female of one and the same 

 species, for which the name first proposed by that author ought to be retained. 

 Boeck also described the 2 sexes as 2 different species, identifying the female 

 with Sp. Bate's species SunampMthoii hamulus, whereas the male is described 

 as a new species of the same genus, under the same of S. longicornis. I have 

 had an opportunity of examining the somewhat defect type specimen of tin- 

 latter, preserved in our Museum, and cannot find any other ditt'rrences from 

 male specimens of the present species than that the antennae are unusually 



