CRUSTACEA MALACOSTRACA. III. 35 



four on fifth and sixth pairs of coxae, but frequently the number is lower, sinking to one or two on 

 second to fourth pairs, and to two on each of the following pairs. 



The abdomen varies somewhat in breadth, but is always pyriform and never slender, being less 

 than half as long again as broad, and generally rather broad; it has always three to five robust spines 

 at each side, placed not in a line, but partly on and partly a little above the lateral margin. — The 

 median lamella of the male operculum (figs. 1 a — 1 b) has several small spines irregularly arranged on 

 the proximal half of the ventral surface; the lamella is from almost three times to somewhat more 

 than three times as long as broad, distinctly tapering from somewhat before to somewhat beyond the 

 middle, while its distal part widens again conspicuously to the end, which is as broad as, or even a 

 little broader than, the proximal half and distinctly emarginate, as the hind margin of each pleopod is 

 a little oblique, while a minute tooth directed backwards is seen at its outer angle. 



Remarks. This species is easily recognized by the characters pointed out above together 

 with the representation of Sars. Especially the shape of the median lamella of the male operculum 

 is important, as it differs sharply from those in all the following forms excepting M. Hanseni. The 

 differences between M. Boeckii and M. groenlandica n. sp. are pointed out at the last-named species. 



Occurrence. Taken by the "Ingolf" at a single station. 



South-West of Iceland: Stat. 85: Lat. 63°2i' N., Long. 25°2i' W., 170 fath.; 1 spec. (poor). 



It has been taken by Dr. Th. Mortensen on three places at the Faeroes, viz. off Boro, 20 — 30 

 fath., 2 spec, (one spec, in Myxilla fimbriata\ north-west of Kalsd, 60 fath., 7 spec, and off Nolso, 100 

 fath., many spec. 



Distribution. West coast of Norway, 20—50 fath. (G. O. Sars); North Sea at Lat. 57°i7' N., 

 Long. 7°47' E., 27 fath. (Zirwas), and at some places in Scotland (T. Scott). The animals recorded by 

 Meinert from Denmark belong to two other species (H. J. Hansen, 1910). 



18. Munna groenlandica u. sp. 

 (PL III, figs. 2 a— 2 d). 

 ?i846. Midi mi Fabricii Kroyer, in Gaimard, Voy. en Scand., Crust. PI. XXXI, figs, i, a — q (partim). 

 1847. — — Kroyer, Nat. Tidsskr., Ny Rsekke, Vol. II, p. 380 (partim). 



Description. As to shape of the body and length of the legs this species is intermediate 

 between M. Boeckii and M. limicola G. O. S. — The eyes (fig. 2 a) are as large as in M. Boeckii. The 

 antennulse (fig. 2 a) a little longer than in that species; the flagellum has in the adult female most 

 frequently 4, but sometimes only 3, long joints, besides a proximal short and a terminal rudimentary 

 joint (an antennula with the first of the long joints uncommonly long but not divided into two joints 

 is shown in fig. 2 a). — The coxse of the thoracic legs somewhat less spiniferous than in M. Boeckii, 

 generally with a single spine on the anterior pairs and two spines on the four posterior pairs. 



The abdomen (fig. 2 b) — the first segment not taken into consideration — is generally a little 

 narrower than in M. Boeckii, and is armed at each margin with two small spines, rarely one spine, and 

 in a single female each side possesses four somewhat small spines visible from above. Uropods as in 

 M. Boeckii. — The median lamella of the male operculum (figs. 2 c — 2d) is characteristic: somewhat 



