633 



articulated flagella, the superior ones the longer and provided with a well- 

 developed accessory appendage. Mandibular palps rather large, with the 

 terminal joint lamellar and densely setiferous. First pair of maxilla? with 

 the basal lobe well developed, and carrying inside several marginal seta? ; 

 2nd pair comparatively large. Maxillipeds about as in the preceding genus. 

 Gnathopoda not very strong and nearly equal sized, propodos comparatvely 

 small and imperfectly subcheliform in female; those in male but little stronger 

 than in female, propodos of the posterior pair produced below. Pereiopoda 

 very slender and elongated, the 3 posterior pairs greatly increasing in length, 

 and having the basal joint linear. Branchial lamellae very small. Pleopoda 

 well developed. The 2 anterior pairs of uropoda normal ; last pair only 

 present as a very slight rudiment. Telson squamiform. 



Remarks. - This genus, established by Boeck, is, as it were, inter- 

 mediate in character between the genera Lcetmatophilus and Dulicliia, some- 

 what resembling the latter in the narrow and slender form of the body, 

 though differing considerably in the structure of the several appendages. 

 The urosome, moreover, is more fully developed than in either of these 

 genera, and exhibits even a rudiment of the last pair of uropoda. The genus 

 comprises as yet but a single species, to be described below. 



3. Xenodice Frauenfeldti, Boeck. 



(PI. 227, fig. 2). 

 Xenodice Frauenfeldti, Boeck, Crust, amph. bor. & arctica, p. 187. 



Body extremely slender and elongated, nearly cylindric in form, with the 

 back evenly rounded throughout. Cephalon about the length of the first 2 seg- 

 ments of mesosome combined, frontal part slightly produced and transversely 

 truncated at the tip, lateral lobes narrowly rounded, postantennal corners well 

 defined. Coxal plates very small, subquadr angular. Epimeral plates of mesosome 

 well developed, last pair nearly rectangular. Eyes imperfectly developed, and 

 replaced on each side by a patch of whitish pigment. Superior antenna? 

 about equalling in length the whole body, 1st joint of the peduncle the 

 shortest, the 2 outer joints very much elongated and nearly equal-sized, 

 flagellum not quite as long as those joints combined, and composed of about 

 12 articulations, accessory appendage nearly V* the length of the flagellum, and 

 composed of 45 articulations. Inferior antenna?, somewhat shorter than the 

 superior, the last 2 joints of the peduncle about equal-sized, flagellum exceed- 

 ing half the length of the peduncle, and composed of about 9 articulations. 



