63 



20. Orchomene crispatus, (Groes). 



(PI. 23, lig. '1). 

 Lymmassa criiipata, Goes, Crust, aniphip. maris Spitsbergire, p. 3, fig. 3. 



Body very robust and j)lumpy, with broadly vaulted back. Cepbalon 

 comparatively slioi't, lateral corners greatlj' ])rojecting and acununated at 

 the tip. Coxal plates very large, the 4 anterior pairs nearly three times as 

 deep as the body and quite concealing laterally the buccal mass, 5th pair 

 fully as deep as broad. Last pair of epimeral plates of metasome rounded 

 at the infei'o-lateral corners, posterior edge straight and finely serrated 

 tliroughout. First segment of uros(.)me without any dorsal projection. Eyes 

 very narrow, oblong linear, pigment reddish brown with a light orange- 

 coloured coating. Superior antennae vrith the 1st joint of the i)eduncle 

 unusually narrow and elongated, almost as long as the whole remainder part 

 of the antenna, flagelliun y-articulate with the 1st joint rather short, acces- 

 sory appendage slender, 6-articulate. Epistomal plate much broader than in 

 the 2 preceding species, but less ])rojecting, obtirsely truncated at the tip. 

 Anterior gnathopoda rather strong, propodos very elongated, much longer 

 than the carpal and meral joints combined, and gradually tapering to the 

 transversally truncated extremity. Basal joint of the 3 posterior pereiopoda 

 very much expanded, that of the last ])air almost rectangular in form. Last 

 pail- of uropoda with the I'ami comparatively coarser and broader than in the 

 other species. Telson short and broad, with 2 pairs of dorsal denticles, cleft 

 rather broad and not quite extending to the middle of the telson. Body 

 more or less distinctly flesh-coloured, especially on its anterior part. Length 

 of adult female reaching 12 mm. 



RemarJcs. — Boeck has erroneously identified the present form, 

 detected by Goes, with his 0. serrafus. As will be seen from the above 

 given diagnosis and the accompanying figures, it represents in reality a very 

 distinct species, dilFering from (). serratus both as to the form of the body 

 and in several anatomical characters. It is now for the first time added to 

 the Norwegian fauna. 



Occurrence. — I have met with this form in a few localities off the 

 west coast of Norway and quite recently also in the Trondhjemsfjord. It 

 occurs, as a rule, in very deep water, esjiecially in the region of the deep-sea 

 corals, dejrth from 100 to 200 fathoms. 



Distribution. — Spitsbergen (Goes). 



