CRUSTACEA MALACOSTRACA. III. 



I 4 I 



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

 Davis Strait: Stat. 36: Lat. 6i°5o' N., Long. 56°2i' W., 1435 fath., 1-5°; 1 spec. 



91. Eurycope cornuta G. O. Sars. 

 (PI. XII, figs. 8 a- 8 k). 



1864. Eurycope cornuta G. O. Sars, Forh. Vid. Selsk. Christiania for 1863, P- 20 9- 



1880. robusta Harger, Rep. U.S. Comm. Fish and Fisheries for 1878, Pt. VI, p. 332; PI. Ill, 



fig. 15. 

 ! 1897. cornuta G. O. Sars, Account, II, p. 145; PL 64. 



The richly illustrated account of this species published by Sars is good as to most particulars, 

 but in order to distinguish E. cornuta easily from the two or three next species it is found necessary 

 to redescribe several features. 



Sars wrote: "... front produced to an acute, rostriform projection", but this is not correct. The 

 projection or rather the anteriorly protruding part of the front area (fig. 8 a) is not acute; even in co- 

 types of Sars the end of the projection is emarginate and its upper surface somewhat concave long- 

 itudinally, as the lateral margins of the front area are raised; furthermore the projection, when seen 

 essentially from the side, has its upper margin horizontal, with the anterior part not curved down- 

 wards, and the end of the projection free. — The basal joint of the antennulas (figs. 8 b, 8 c and 8 d) 

 varies somewhat in shape in individuals even from the same haul ; the inner margin is straight, some- 

 what or considerably shorter than the breadth of the joint, and from a little to a good deal shorter 

 than the distance between the antero-exterior point of the front margin and an obtuse or rounded 

 angle on the hind margin; the anterior margin is irregularly but considerably concave, as the antero- 

 inferior part of the joint is produced into a somewhat short lobe; second joint, which originates on 

 the surface of the first considerably behind its front margin, is middle-sized, conspicuously thicker in 

 the male (figs. 8 c and 8 d) than in the female (fig. 8 b); the third joint is much more slender, as long 

 as or somewhat longer than the second. — Antennal squama (fig. 8 e, so) well set off, oblong-triangular, 

 conspicuously less than half as long as the breadth of third antennal joint, and armed at the end and 

 laterally with a few small spines. 



Abdominal operculum in the female seen from below (fig. 8 g) much broader than long, in the 

 main transversely oval, with somewhat more than the posterior half of its whole margin almost semi- 

 circular; on the lower surface it has a median keel, which is rather far from reaching the anterior or 

 the posterior margin. Seen from the side (fig. 8 f) the female operculum is highly vaulted, with its 

 lower margin angular at the middle, and the posterior angle is rounded. — The median lamella (fig. 

 8 h) of the male operculum about two and a half times as long as broad, at the middle feebly narrowed, 

 and the distal half of each outer margin flatly convex excepting at the end, as the terminal part of 

 each pleopod is produced backwards as a small plate (fig. 8 i), which is broader than long, with its 

 hind margin somewhat convex and the postero-lateral corner produced into a small, triangular tooth 

 directed outwards. The lateral plates (fig. 8 k) of the male operculum are very broad, though consider- 

 ably longer than broad, without anv broad, hairy lobe on the outer side near the base; the outer 



