BOREOMVSIS FRAGILIS. 191 



Remarks. — This species is allietl to B. sibogae H. J. H., Ijut differs especially 

 in having the antenna! squama conspicuously broader with the end obhque 

 and the inner margin more convex; furthermore, the telson is distally much 

 narrower and the incision conspicuously shorter than in B. sibogae. 



9. Boreomysis fragilis, sp. nov. 



Plate 1, fig. 3a; Plate 2, fig. la. 



Lat. 5° 22' S., long. 84° 39' W. 300 fm.s. to surface. 3 specimens. 

 Lat. 5° 44.7' S., long. 82' 39.5' W. 400 fms. to surface. 1 specimen. 

 Lat . 5° 57.5' S., long. 80° 50' W. 400 fms. to surface. 1 adult female. 

 Lat. 12° 6.9' S., long. 78° 28.2' W. 300 fms. to surface. 1 specimen. 

 Lat. 14° 28.9' S., long. 81° 24' W. 300 fms. to surface. 1 specimen. 

 Lat. 17° 26.4' S., long. 86° 46.5' W. 300 fms. to surface. 2 adult speci- 

 mens, male (Type) and female. 



Description. — Frontal plate considerably produced, subtriangular (fig. 3a), 

 with the lateral margins very feebly convex and a little concave in front at the 

 rostral process, which is triangular, acute, and bent a little upwards. Eyes very 

 small, reddish brown, looking forwards and especially downwards, only a narrow 

 strip being visible from above; the eye-stalks increase somewhat in breadth 

 from the base outwards and are somewhat longer, measured from the middle 

 of the terminal margin, than broad; at the upper inner angle produced into an 

 oblong-triangular process reaching considerably beyond the cornea. 



The antennal squama is somewhat less than four times as long as broad, 

 broadest somewhat before the middle and there almost twice as broad as at the 

 end; the outer margin is feebly concave, the terminal margin oblique, and the 

 outer tooth very distinct. 



Exopod of the uropods (fig. la) seven times as long as broad, with a couple 

 of fine spines on the outer margin at the end of its naked basal fifth. Telson 

 proportionately broad, scarcely more than three times as long as broad, but at 

 the beginning of its terminal fourth only about two fifths as broad at a little 

 from the base; the terminal incision, which occupies about one fifth of the total 

 length, has its proximal portion triangular and a little acuminate, while the major 

 part of the lateral margins of the incision are more or less distinctly diverging. 

 The lateral margins of the telson are furnished with a moderately small number 

 of spines; seven or eight at each side are somewhat small but yet considerably 

 or much longer than the others which are very or extremely small. 



In the adult male the exopod of third pair of pleopods is about half as 

 long again, the exopod of second pair about one third as long again, as the 

 endopod. 



