CRUSTACEA MALACOSTRACA. III. 8l 



Abdomen slightly longer than the two posterior thoracic segments combined, somewhat or 

 considerably broader near the base than jnst in front of the uropods (fig. 4 f), from considerably less 

 to a little more than half as long again as broad (fig. 4 g), with the major part of the lateral margins 

 distinctly convex; posteriorly the abdomen is very moderately produced and broadly rounded, with 

 each half of the posterior margin slightly or scarcely concave towards the uropods. -- The operculum 

 ("g- 4 g) is moderately large, twice or slightly more than twice as long as broad, posteriorly moderately 

 narrow and rounded, and reaching scarcely to the insertion of the uropods; the anal doors unusually- 

 short, yet occupying most of the rather short part of the ventral excavation behind the operculum. 

 — The uropods (fig. 4 f) a little more than half as long as the abdomen, somewhat slender, two-jointed, 

 with first joint from twice as long as the second to only somewhat longer. 



Length of two females with marsupium 32 mm. and 2-9 mm. 



Remarks. M. subinermis is sharply distinguished from the three preceding species by having 

 the abdomen rather feebly produced posteriorly, and by the uropods, etc. It is allied and similar to 

 M. longiremis Mein., but its uropods are shorter, the ventral armature on the thorax is feebly devel- 

 oped, while in M. longiremis the ventral processes on first segment and especially those on the posterior 

 segments are long and slender; the posterior end of the female operculum is conspicuously narrower 

 than in M. longiremis, and appreciable differences are also found in third pair of legs and their setae. 



In a young female with seventh pair of legs only half developed, the uropods, especially their 

 first joint, are shorter (fig. 4. li ) than in the adults. — The single male found (from Stat. 139) is scarcely 

 adult and has the operculum very mutilated; it differs from the females in having the ventral thoracic 

 processes conspicuously longer, the abdomen about half as long again as the uropods, and these uropods, 

 which consequently are proportionately longer than in the females, have the first joint slightly more 

 than twice as long as the second; in other respects this male does not show any differences worth 

 mentioning from the female. 



Occurrence. Taken by the "Ingolf" at five stations, all in the cold area. 



North of the Faeroes: Stat. 139: Lat. 63°36' N., Long. 7°3o' W., 702 fath., temp. -r-o-6°; 2 spec. 



East of Iceland: Stat. 103: Lat. 66°23' N., Long. 8°52' W., 579 fath., temp. -=-o-6°; 1 spec. 

 — - vStat. 102: Lat. 66°23' N., Long. io°26' W., 750 fath., temp. -^0-9°; 10 spec. 



North-East of Iceland: Stat. 119: Lat. 67°53' N., Long. io°i9' W., 1010 fath.; temp, -f- ro°; 2 spec. 



North of Iceland: Stat. 125: Lat. 68°o8' N., Long. i6°02' W., 729 fath.; temp. -4-0-8°; 2 spec. 



Besides, it has been taken by the "Thor" at the following place in the cold area. 



East of Iceland: Lat. 66°i9' N., io°45' W., 765 fath., temp. -4-0-92°; 1 spec, (young $). 



50. Macrostylis longiremis Meinert. 



(PI. VII, fig. 5 a). 



1890. Vana longiremis Meinert, "Hauchs" Togter, p. 195; PI. II, figs. 63 — 73. 

 ! 1899. Macrostylis longiremis G. O. Sars, Account, II, p. 250; Suppl. PI. II, fig. 1. 



Sars has published good figures of the animal from above, of antennulae, antennae, maxillipeds 

 and several legs. As already stated in my remarks on M. sttbinermis, the processes on first sternite 



The Ingolf-Expedition. III. ;. II 



