CRUSTACEA MALACOSTRACA. III. 77 



segments are as large as in females without marsupium, but the process on first sternite is small, and 

 those on the four other sternites wanting. The steruites in the male armed about as in females with- 

 out marsupium. - The dorsal spine 011 third joint of third pair of legs is, as figured by Sars, strong 

 and very curved. 



Abdomen conspicuously more than half as long again as broad, in the male slightly or not 

 longer than the two preceding segments combined, in the female as long as these two segments and 

 half of fifth segment combined. -- The operculum reaches in the female (fig. 6 b) to rather near the 

 end of the abdomen, thus overlapping the anal doors; it is slightly more than twice as long as broad 

 — thus conspicuously broader than drawn by Sars — and its distal end is broadly rounded. In the 

 male the operculum (fig. 6 a) terminates far from the end, and even before a line between the insertion 

 of the uropods, thus leaving a long ventral channel uncovered, and in the anterior half of this channel 

 the large anal doors are seen. 



Length of adult females from Skager Rak 2'2 mm., of males 2 mm. 



The somewhat aberrant specimen from Stat. 80 is a scarcely full-grown female, 2 mm. long. 

 The antenna; reach nearly the middle of fourth thoracic segment; the penultimate joint (fig. 1 a) of 

 the peduncle is one-third as long again as the terminal, thus proportionately longer than in the typical 

 form; flagellum 7-jointed. The dorsal spine on third joint of third pair of legs is quite straight (fig. 1 b), 

 and scarcely as strong as in the typical form. The abdomen (fig. 1 c) is distinctly less than half as 

 long again as broad, its lateral margins being more convex than in the typical form. But being un- 

 able to find any further difference between this specimen and the Danish specimens I consider it to 

 be an individual or local variety. 



Remarks. M. spinifera differs sharply from the other species, excepting M. abyssicola and M, 

 elongata, in having the posterior part of the abdomen strongly produced as a long and distally broadly 

 rounded lobe between the uropods. From M. abyssicola it differs in having the antennulse twice as 

 long, the produced end of the abdomen much broader, the female operculum long, etc. M. elongata 

 differs from M. spinifera in the extremely long, many jointed uropods, the antennae only as long as 

 the head, with the distal peduncular joints short, etc. 



Occurrence. Taken by the "Ingolf" at two stations. 



Davis Strait: Stat. 32: Lat. 66°35' N -> Long. 56°38' W., 318 rath., temp. 3-9°; 1 spec. (d 1 ). 



South-West of Iceland: Stat. 80: Lat. 6i°02' N., Long. 2o,°32'W., 935 fath., temp. 4-0°; 1 spec. (?). 



Distribution. In Christiania Fjord, 15—20 fath., and in places at the west coast of Norway 

 northwards to Lofoten (G. O. Sars); besides off the Skaw in Skager Rak, 125 fath. (H. J. Hansen). 

 Finally fifty miles south-east of Fair Island (Shetland), 65 fath. (T Scott). 



47. Macrostylis abyssicola n. sp. 

 (PI. VII, figs. 2 a— 2 h). 



Description. Body of the female somewhat more than three and a half times, that of the male 

 four and a half times, as long as broad; in general aspect similar to If. spinifera. — The antennulae 

 are verv short, 3-jointed, with first joint nearly longer than the two other joints combined; in the 



