74 



CRUSTACEA MALACOSTRACA. II. 



tioning. lu his specimen the posterior legs have the seventh joint a little shorter and the claw longer 

 (viz. half as long as seventh joint) than in my specimen. The only important difference between the 

 two specimens is that in the antennulse the seventh joint is considerably or rather much shorter than the 

 sixth in Vanhoffen's specimen, a little longer than the sixth in my specimen. Btit in spite of this 

 difference, I think that both males belong to the same species. In males of Leptognathia breviremis 

 I have observed a conspicuous variation in the length of seventh antennular joint. The female of 

 L. longiremis is allied to L. Hanseni, but the male of L. longiremis differs strongly from that of L. 

 Hanseni in the armature of the chelae and the extreme length of seventh joint with claw on the po- 

 sterior pairs of thoracic legs (vid. Lilljeborg and my figures published in 1910). The male figured by 

 Sars as belonging to his L. longiremis differs also widely from that of L. Hanseni. Consequently I am 

 induced to think that the specific differences between males of different species of this group a are 

 much larger than between Vanhoffen's specimen and my own, and that the differences observed be- 

 tween these two specimens are due only to variation. 



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



West Greenland: Mouth of Ameralik Fjord, near Godthaab, 5 70 fm., shells; more than a 



hundred females and immature males, and one adult male. 



L. Hanseni has besides been taken at several other places in Greenland by various Zoologists. 

 West Greenland: Karajok Fjord, ab. Lat. 70 20' N.; several spec. Dr. E. Vanhoffen. 



Kekertak, Lat. 69 58' N., 3540 fm., clay; i spec. Nordenskjold Exped. 1870. 

 East Greenland: Angmagsalik, ab. Lat. 65 r / 2 ; 2 spec. Mag. Kruuse. 



4 ii fm.; 2 spec. Ryder Exped. 

 Tasiusak, Lat. 65 37' N., 20 30 fm., stones with algae; i spec. I st Amdrup 



Expedition. 



Cape Dalton, Lat. 69 24.6' N., 9 11 fm.; 2 spec. IF Amdrup Exped. 

 Denmark Island, Lat. 70 27' N. ; i spec. Ryder Exped. 

 The species is hitherto only known from Greenland. 



45. Leptognathia longiremis Lilljeborg. 

 (PL VII; figs. 3 a- 3 e.) 



1864. Tanais longiremis Lilljeborg, Bidrag till kannedomen om de inom Sverige och Norrige 



forek. Crust, af . . . Tanaidernas familj, p. 19 (Female and adult male). 



1910. Leptognathia longiremis H. J. Hansen, Vidensk. Medd. Naturh. Forening i Kjobenhavn for 1909, 



p. 229, PI. V, figs. 3 a 3b. 



Female. General aspect as L. Hanseni. -- Antennulae (fig. 33) moderately strong. First joint 

 a little longer than the three other joints combined, somewhat less than three times as long as deep, 

 moderately tapering; second joint slightly longer than the depth of first joint, considerably produced 

 above and somewhat thick; upper margin of third joint less than half as long as that of the second; 

 fourth joint a little shorter than the second. Antennae as in L. Hanseni. 



Chelipeds (fig. 33) nearly as in L. Hanseni; carpus a little less than twice as long as deep; 



