amounting to about 14 in all. Only a single species is as yet found off the 

 coast of Norway. 



Apseudes spinosus, M. Sars. 

 (pi. i & ii.) 



Rhoea spinosa, M. Sars, Oversigt over tie i den Norsk-arktiske Region forekommende Krebsdyr. 



Christiania Vid. Selsk. Furh. f. 1858, p. 30. 



Syn: Apseudes talpa, Lilljeb. (not Mont.). 



Specific Characters. — Body very slender and elongated, gradually tapering 

 behind. Cephalosome distinctly areolated above, with a slight notch on each side 

 in front of the middle, rostral plate cordiform, denned on each side by a distinct 

 notch, and terminating in an acute, somewhat deflexed point. Ocular lobes well- 

 defined, outer part slightly tumefied, and armed anteriorly with a short pointed 

 prominence. Free segments of mesosome defined by deep constrictions, and having 

 the upper face slightly tubercular. 1st pair of coxal plates of moderate size, 

 spiniform, and pointing obliquely outwards, the others rather small and rounded. 

 Antero-lateral corners of the 5 posterior segments produced to triangularly pointed, 

 setiferous projections. Metasome very narrow, with the epimera of the 5 anterior 

 segments produced to spiniform projections densely clothed with long ciliated 

 bristles, terminal segment narrow and elongated, equalling in length the other 5 

 combined, subcylindrical in form and furnished laterally with numerous small 

 setiferous nodules. Eyes imperfectly developed, with opaque whitish pigment and 

 devoid of any distinct visual elements. Superior antennae rather elongated, 1st 

 joint of the peduncle attenuated distally and finely serrated in the proximal half 

 of the inner edge, flagellum fully as long as the peduncle and 16 — 20-articulate, 

 accessory appendage about half as long, and 8 — 9-articulate. Inferior antenna? 

 with the flagellum longer than the peduncle. Chelipeds in female rather robust, 

 scarcely smaller than the fossorial legs, basal joint fusiform, with a strong denti- 

 form projection on the posterior edge beyond the middle, hand much larger than 

 the carpus, oblong ovate- in form, thumb with a distinct tubercle in the middle 

 of the inner edge; those in male with the hand very large and tumid, both the 

 thumb and the dactylus strongly tubercular inside. Uropoda very much elongated, 

 attaining almost half the length of the body, inner ramus composed of about 30 

 articulations, outer ramus scarcely ] /3 as l° n g anc l 12-articulate. Colour whitish. 

 Length reaching to 13 mm. 



Remarks. — The present species was briefly described by my late father 

 in the year 1858 as Shorn spinosa, but was subsequently, by most authors, identi- 



