﻿y . CRUSTACEA MALACOSTRACA. II. 



tioning. In his specimen the posterior legs have the seventh joint a Httle shorter and tlie claw longer 

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

 two specimens is that in the antennnlse 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. But in spite of this 

 difference, I think that both males l)elong to the same species. In males of Leptognnthia brcvirniiis 

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

 L. longireiiiis is allied to L. Hansiiii, but the male of L. longireniis differs strongly from that of L. 

 Hansrrii in the armature of the cheUe and the e.xtreme 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. longirniiis differs also widely from that of L. Hansrrii. Consequently I am 

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

 much larger than between \^anhoffen'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: iNIouth of .\nieralik Fjord, near Godthaab, 5 — 70 fm., shells; more than a 



hundred females and immature males, and one adiill male. 



L. Haiiseiii 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., 35—40 fm., clay; i spec. Nordenskjold Exped. 1870. 

 East Greenland: Angmagsalik, ab. Lat. 65' ^,°; 2 spec. Mag. Kruuse. 



— — — 4 — II fm.; 2 spec. Ryder Exped. 



— — Tasiusak, Lat. 65° 37' N., 20 — 30 fm., stones with algae; i spec. L" Amdrup 



Expedition. 



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



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

 The species is hitherto only known from Greenland. 



45. Leptognathia longireniis Lilljeborg. 

 (PI. VII; figs. 33-30 



1864. Tanais longircmis Lilljeborg, Bidrag till kiinnedomen om de inom Sverige och Norrige 



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

 1910. Lrptogtiathia longirniiis H. J. Hansen, Vidensk. Medd. Natm-h. Forening i Kjobenhavn for 1909, 



p. 229, PI. V, figs. 3 a— 3 b. 



Female. General aspect as L. Hanseni. — Antennulse (fig. 3a) moderately strong. First joint 

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

 moderately tapering; second joint slightly longer than the depth of first joint, considerabh- 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. — Antennse as in L. Hanseni. 



Chelipeds (fig. 3a) nearly as in L. Hansrni\ carpus a little less than twice as "long as deep; 



