16 



Thami/nt< iSji. Bate, Thaiimeux Bovall., I'urulijcaiu Clans, IWuduIijccca Claus 

 and tSimoiiiijHchns Claus. The family is mainly represented in the tropical 

 ])ai't (if the Oceans, the genus Tnjplueiiu being the only northern representative. 



Gen. 5. Tryphsena, Boeck, 1870. 



Body comparatively short and stout, with rounded, not carinated l)aek. 

 Cephahin nuicli deeper than the l)ody, slightly produced in front, inferior side 

 dee])ly canaliculated. Mesosome more or less abbreviated, metasome greatly 

 developed, urosome comparatively short and depressed. First pair of antennae 

 originating from the inferior side of the head in front, and admitting of being 

 reflexed within the deej) ventral furrow; Hagellum triarticulate, 1st juint in 

 female rather short, in male globularly expanded and liearing a dense tuft 

 of sensory hairs at the posterior edge, "ind joint linear with a few sensory 

 appendages near the ti]), in male rather narrow and produced inferiorly to a 

 spiniform [irocess, last joint in both sexes narrow styliform. Second pair of 

 antennae fixed, at a great distance from the 1st pair, to the infero-lateral 

 corners of the cephalon; in female veiy small and immoljile, triarticulate, 2nd 

 joint laminai', terminal one minute, scale-like; in male very large, ])eduncle 

 4-articulate, the 2 outer joints slender and angularly bent, flagellum very 

 narrow filiform, indistinctly articulate and likewise angularly Ijent. Anterior 

 lip tiiangular, with a very short, slightly emai'ginated buccal ])late; ]iosterior 

 lip wanting. Mandibles without any molar expansion, ]jalp naked, liiarticulate 

 (in female). Both pairs of maxillae forming simple narrow plates without any 

 armature. Maxillipeds large, operculiform ; terminal lobes short and broad, 

 crescent-like, unarmed. Clnathopoda small, not chelate; 1st pair with the 

 basal joint very large, lamellar, dactylus sjiiniform, immobile; 2nd jiair rather 

 slender, dactylus densely hairy and terminating with a kind of sensory 

 apparatus (?). Pereio])oda almost naked, 3rd pair the largest, last pair very 

 small. Uropoda comparatively short, with broadly louceolate rami. Telson 

 large, triangular. 



licmarJif-. — Owing to the generally very imperfect investigation of 

 Hyperids by Dana and earlier authors, Boeck has failed to recognise the 

 near relationship of his genus TrifplHCHu to the genus Lijcaa of Dana. In 

 fact, th(^ only essential difference l)etween the two would seem to consist in 

 a slightly different structure of the gnathopoda, and hence 1 thought it right, 

 in the 1st ])art of my «Oversigt af Norges Crustaceer», to refer Boeck's 

 species to the said genus. Meanwhile Dr. Bovalius has recently maintained 

 the distinctness of Boeck's genu.'^, though referring the genius Lyrcra to the 



