1(1 



x Sp. Bate, Thammux Bo vail., Paralyccea Glaus, Pseudolyccea Glaus 

 and Simorhynchiis Glaus. The family is mainly represented in the tropical 

 part of the Oceans, the genus Tryplwua being the only northern representative. 



Gen. 5. Tryphsena, Boeck, 1870. 



Body comparatively short and stout, with rounded, not carinated back. 

 Cephalon much deeper than the body, slightly produced in front, inferior side 

 deeply 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 deep ventral furrow; flagellum triarticulate, 1st joint in 

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

 of sensory hairs at the posterior edge, 2nd joint linear with a few sensory 

 appendages near the tip, in male rather narrow and produced interiorly to a 

 spiniform process, 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 very small and immobile, triarticulate, 2nd 

 joint laminar, terminal one minute, scale-like; in male very large, peduncle 

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

 narrow filiform, indistinctly articulate and likewise angularly bent. Anterior 

 lip triangular, with a very short, slightly emarginated buccal plate; posterior 

 lip wanting. Mandibles without any molar expansion, palp naked, Inarticulate 

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

 armature. Maxillipeds large, operculif orm ; terminal lobes short and broad, 

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

 basal joint very large, lamellar, dactylus spiniform, immobile; 2nd pair rather 

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

 apparatus (?). Pereiopoda almost naked, 3rd pair the largest, last pair very 

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

 large, triangular. 



Remarks. - Owing to the generally very imperfect investigation of 

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

 near relationship of his genus Tryphmia to the genus Li/cn-a of Dana. In 

 fact, the only essential difference between the two would seem to consist in 

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

 in tlie 1st part of my 0versigt af Norges Crustaceer, to refer Boeck's 

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

 Ilie distinctness of Boeek's genus, though referring the genus Li/Cffti to the 



