334 



chalky wliite pigment, irregularly distributed within the cephalon and partly 

 extending within the anterior part of the mesosome. Superior antennae in 

 female rather slender, exceeding in length the cephalon and the first 3 segments 

 of mesosome combined, 2nd joint of the peduncle somewhat longer than the 1st 

 and very narrow, flagellum about the lengtli of the 2 last peduncular joints, 

 and composed of aboixt 10 articulations; those in male having the flagellum 

 more strongly developed, and divided into numerous (about 22) articulations 

 densely clothed with sensory hairs. Inferior antennaB in female Init little 

 longer than the superior, the 2 outer joints of the peduncle nearly equal-sized, 

 flageUum about the length of those joints combined; same antennae in male very 

 much elongated, attaining the length of the whole body, fiagellum slender and 

 filiform. Anterior gnathopoda with the propodos scarcely as long as the carpus, 

 and oval in form, palm longer than the hind margin, and defined from the 

 same by a slight angle armed with a long and slender spine, carpal expansion 

 short and broad. Posterior gnathopoda much more slender than the anterior, 

 carpus very much elongated and narrow, scarcely at all expanded below, 

 propodos oblong oval, with the palm very oblique and more than twice as 

 long a.s the hind margin, from which it is defined by an obtuse angle bearing 

 a long and slender spine. Pereiopoda moderately slender, propodal joint 

 of the 2 anterior pairs fully as long as the carpal one, and provided anteriorly 

 with several tufts of slender bristles, dactylus rather elongated; the 2 suc- 

 ceeding pairs successively increasing in length, basal joint much larger in 

 the former than in the latter pair, dactylus smaller than in the 2 anterior pairs. 

 Last pair of pereiopoda moderately elongated, basal joint rather large, oblong 

 obpyriform in outline, carpal joint much shorter than the meral one, propodal 

 joint nearly twice as long as the former. Last pair of uropoda not very 

 much elongated, basal part somewhat dilated, rami a little longer than the 

 latter and edged with short spinules. Telson very small and rather broad 

 at the base, its breadth being even greater than the length, tip slightly 

 insinuated. Colour uniformly ])ale yellowish; ova in the marsupial pouch 

 likewise yellowish of colour. Length of adult female 6 mm., of male about 

 the same. 



Rei)iarl\t. — The present form may be regarded as the type of the genus 

 Bathynmlon. It is easily distinguish from any of the ffidiceridae described 

 above by the absolute want of true eyes, instead of which there are only 

 some irregular patches of a chalky white pigment. From the 2 other species 

 of the genus, it is chiefly distinguished by the structure of the gnathopoda 

 and ])ereiopoda, as also by the form of the cephalon. 



Occurrence. — In greater depths, from 50 to 200 fathoms, this form 

 ^s rather abundantly found off the whole south and west coasts of Norway, 



