430 



3. Apherusa bispinosa (Sp. Bate) 



(PI. 155, fig. 1). 



Dcxaminc bispinosa, Sp. Bate, Ann. Nat. Hist. 2 ser. XIX, p. 142. 



Syn. : Amphithoi! macrocephala, M. Sara. 

 Paramphithoe elegans, Bruzel. 

 Atylus bispinosus, Sp. Bate. 

 Halivages bispinosus, Boeck. 



Body rather slender, especially in the male, and having the 2 anterior 

 segments of metasome each produced dorsally to an acute, posteriorly-pointing 

 projection. Cephalon comparatively large, exceeding in length the first 2 

 segments of mesosome combined, rostral projection distinctly prominent and 

 acute, lateral corners small, angular, postantennal ones produced to a short, 

 somewhat deflexed point. Anterior pairs of coxal plates scarcely as deep as 

 the body; 1st pair slightly expanded distally, and having the anterior corner 

 subangular; the 2 succeeding pairs successively somewhat larger, and rounded 

 quadrangular in form; 4th pair the largest, about as broad as they are deep, 

 and slightly emarginated posteriorly. Penultimate pair of epimeral plates of 

 metasome produced at the lateral corners to an acute recurved projection; 

 last pair forming a broad lamellar expansion truncated at the tip, and some- 

 what resembling that in Helirages fidvocinctus, being, however, more coarsely 

 serrated, and having the upper corner strongly produced, subuncinate; above 

 it occurs, moreover, a bidentate projection of the hind margin defined from 

 the former by a deep sinus. Eyes large and of a roundish form, with well 

 developed visual elements and dark brown pigment. Superior antennae in 

 female scarcely exceeding l /s of the length of the body, and having the 

 peduncle comparatively short, with the 1st joint rather thick, and longer than 

 the other 2 combined, flagellum nearly 4 times as long as the peduncle, and 

 composed of about 30 articulations. Inferior antennae nearly twice as long 

 as the superior, last joint of the peduncle somewhat larger than the penul- 

 timate one, flagellum very slender and elongated. Both pairs of antennae in 

 male considerably more elongated than in female, and having the opposite 

 edges of the peduncles clothed with fascicles of delicate sensory bristles. 

 Gnathopoda very slender and feeble in structure, carpus of the anterior ones 

 somewhat longer than in the posterior, propodos in both pairs narrow oblong, 

 with the palm somewhat oblique, though much shorter than the hind margin, 

 from which it is defined by on obtuse angle bearing several slender spines. 

 Pereiopoda moderately slender, and densely edged with fascicles of short 



