9 8 



CRUSTACEA MALACOSTRACA. 111. 



Length of a specimen without marsupium 2 111m. 



Male. Surface reticulate as in the female. Body scarcely three and a half times as long as 

 broad; the difference in breadth between the anterior and the posterior segments (fig. 2 a) is smaller 

 than in the female, and fourth segment is not only narrower than the first, but even a little narrower 

 than the seventh. — Head between six and a half and six times as broad as the distance between 

 the ends of the cephalic keels; the distal half of these keels is much more convex than in the female, 

 and the anterior margin of the front area is extremely concave (fig. 2 b). — Antennulae and proximal 

 joint of antenna; as in the female. 



The thoracic segments, excepting as to the breadth already mentioned, nearly as in the female; 

 even the ventral protuberances of the two posterior segments scarcely differ from those in the female, 

 but the protuberance on fifth segment (fig. 2 k) is distinctly lower. — Legs as in the female; no 

 natatory setae on the three posterior pairs. 



Abdomen (figs. 2 a and 2 1) distinctly broader than long and posteriorly scarcely produced. — 

 Operculum a little longer than broad; the median lamella much broader before the middle than towards 

 the end, with the outer distal corner angular, and the terminal margin of each pleopod oblique. — 

 Uropods nearly as in the female. 



Length r8 mm. 



Remarks. N. reticulatus is instantly distinguished from all other species hitherto known by 

 the very conspicuous network on nearly the whole dorsal surface. The frontal emargination is un- 

 commonly deep, especially in the male. 



Occurrence. Taken by the "Ingolf" at a single station in the cold area. 



North of Iceland: Stat. 126: Lat. 67°io/ N., Long. i5°32' W., 293 fath., temp. -^ 0-5°; 6 spec. (3 o*, 3 ?)• 



60. Nannoniscus inermis n. sp. 

 (PI. IX, figs. 4 a- 4 f). 



Female. Body about three and one-third times as long again as broad. Second and third 

 thoracic segments nearly one-third as broad again as sixth or seventh segment, and the lateral margins 

 of fourth segment converge only moderately backwards. 



Head a little more than four and a half times as broad as the distance between the anterior 

 ends of the cephalic keels (fig. 4 a), and the anterior margin of the front area is slightly convex. — 

 Antennulse (fig. 4 b) very characteristic; first joint longer than broad; second joint a little longer than 

 the first, rather slender and slightly thicker towards the end, which has the angles, at most, feebly 

 protruding; third joint is unusually long and totally visible; fourth joint with the process somewhat 

 long, but reaching slightly beyond the middle of the vesicle, which is uncommonly narrow and long, 

 between two and a half and three times as long as broad. — Antennae slightly more than half as 

 long as the body; fifth and sixth peduncular joints about equal in length, slender and somewhat 

 thickened at the end; flagellum somewhat longer than sixth joint, with more than its proximal half 

 unjointed, while the distal part is divided into 8 joints; squama small, triangular, slightly longer than 

 broad, acute (fig. 4 b). 



Second thoracic segment with a rather slender spine on the antero-lateral angles, and a nearly 



