76 



CRUSTACEA MALACOSTRACA II. 



Distribution. Lilljeborg examined specinien.s taken off Bohuslan and at Molde (west coast 

 of Norway at hat. 62° 42' N.). Material from Norway determined b>- Sars contained, as already stated, 

 several specimens of this species together with two other species. In 1910 I enumerated two localities 

 in Skager Rak, no and 125 fm., and one locality in Kattegat, 20 fm. — All other localities for L. 

 longircmis mentioned in the literature ought to be discarded as doubtful or erroneous, and the material 

 in qiiestion re-examined by the aid of the present paper. 



46. Leptognathia inermis n. sp 

 (PI. VII, figs. 4a-4g-) 



Female. The antennula; (fig. 4a) differ conspicuously from those in the preceding forms. 

 First joint is robust, considerably shorter than the three other joints combined, only twice as long as 

 deep and somewhat tapering; second joint is thick and long, with its upper margin somewhat longer 

 than the depth of the first joint and it is somewhat produced above; third joint with its upper margin 

 not fully half as long as the second; fourth joint somewhat shorter than the second. — Antenme with 

 fifth joint more than half as long again as the fourth, which is distinctly shorter than the sixth. 



Chelipeds (figs. 4 a and 4b) robust. Carpus extremely deep, only about half as long again as 

 deep, with the distal half conspicuously or, generally, strongly expanded downwards and the corre- 

 sponding part of the lower margin very convex, nearly semicircular. Chela as long as or a little 

 longer than the carpus, from slightly more to distinctly less than twice as long as broad, thus rather 

 broad, with the distal anterior corner of the hand at the insertion of the movable finger angular and 

 frequently protruding, subrectangular or even with a subacute angle; movable finger uncommonly 

 broad towards the base; with the anterior margin glabrous excepting in a single immature specimen 

 (from East Greenland) which has nearly half of this margin sinuate, with three impressions (fig. 4g); 

 fixed finger with three teeth on the distal part of the incisive margin, but these teeth are frequently 

 obtuse and one or two among them poorly developed. 



The thoracic legs are somewhat shorter and thicker than in the five preceding species. Second 

 and third pairs subsimilar (figs. 4c and 4d); the spine from the distal posterior angle of fourth joint 

 very long, from a little longer to somewhat shorter than fifth joint; the last-named joint varies con- 

 siderably in breadth, being sometimes twice as long as broad, but most frequently broader, even onh- 

 somewhat longer than broad, with the posterior margin straight or with a couple of low serrations; 

 (perhaps the extreme breadth is due to compression originating from the influence of alcohol); sixth 

 joint considerably longer than, sometimes even half or slightly more than half as long again as, the 

 fifth and always considerably longer than seventh joint with claw. Posterior pairs of legs (fig. 4e) 

 with sixth joint about as long as seventh plus the short claw; seventh joint with the row of minute 

 setiform denticles more or less distinct. 



Five anterior abdominal segments (fig. 4f) without any ventral median row of real tubercles, 

 as the lower median margin of each segment is, seen from the side, rather flatly convex. Pleopods 

 as in L. lo7igiremis. Sixth abdominal segment, seen from the side (fig. 4f), generally, and in full-grown 

 specimens probably always, more flatly convex than in all preceding species. — Uropods longer than 



