CRUSTACEA MALACOSTRACA. 



squama. The last joint of the mandibular palp (fig. 4 c) is comparatively much broader and somewhat 

 shorter than in P. rosciim, and distinctly triangular. In the maxillipeds (fig. 4d) the 5"^ to 7"' joints 

 especially are somewhat broader than in P. roseuiii, the 5"" besides obviously shorter than in this 

 species. The 2"'' joint of the first pair of legs has on its underside distally a distinct, thick, rounded 

 protuberance and proximally a smaller one; the whole leg (fig. 4 e) is somewhat thicker and shorter 

 than in P. rosciivi, the 5"" and 6"' joints especially being shorter; the proximal part of the exopod is 

 very broad. In the female the 4"' and 5"" pair of abdominal appendages (fig. 4 f) especially are 

 obviously longer than in P. roscioii, the 4"' pair being a little longer than the 5"' segment, the 5"' pair 

 even a little longer than the long 6"' segment. The inner branch of the uropods (fig. 4g) reaches 

 quite as far backwards as the outer branch, whereas in P. roseiitn it is considerably shorter than the 

 latter. The telson (fig. 4 h) is somewhat longer and narrower than in P. rosnim; its end in my single 

 specimen with the tail-fan well preserved is broad and somewhat flatly rounded with 3 pairs of long 

 spines of equal length, whilst ciliated setce could not be detected; on each lateral margin are 5 to 6 

 spines. — Length of an ovigerous female 13 mm. 



Remarks. This species is widely separated by the structural characters mentioned from all 

 the foregoing except P. Thceli to which it stands near especially in the form of the squama, the last 

 joint of the mandibular palps and the comparatively plump maxillipeds and first pair of legs. But 

 P. Tliceli according to Ohlin is 20 mm. long, thus much larger, its eye-plate shows quite a different 

 form and its telson is somewhat longer in relation to its breadth. 



Occurrence. West Greenland: Karajok Fjord, ca. 70^ 20' N. L., 100 fm., Vanhoffen. 



28. Mysidopsis didelphys Norm. 



1863. Mysidopsis didelphys Norman, Trans. Tyneside Natur. Field Club, Vol. V, p. 270, PL XII, figs. 9— 11 



(teste Norman). 

 ! 1872. Mysidopsis didelphys G. O. Sars, Mon. Norges Mysider, II, p. 20, Tab. VII. 

 Occurrence. Only twice taken by the "Thor". 

 South of Iceland: 63° 46' N. L., 22°56'W. L., 80 fm.; ca. 15 spec. 



— - — 63° 18' — 21° 30' — 94 — ; 2 spec. 

 Distribution. It is known from the Shetlands, both coasts of Scotland and north-east Eng- 

 land, 40 — 70 fm. (Norman, Th. Scott), west of Ireland in depths from a little over 50 tf) 199 fm. (Holt 

 & Tattersall), also Skager Rak N. E. from the north point of Jutland, no fm. (Meinert) and Norway 

 from Christiania Fjord to Lofoten, 30 — 150 fm. (G. O. Sars). 



29. Pseudomysis abyssi G. O. Sars. 



PI. V, fig. 5 a— 5 d. 

 1879. Pseudomysis abyssi G. O. vSars, Arch. Math, og Naturv., IV, p. 430. 



1885. — _ G. O. Sars, Norske Nordhavs-Exp., Crust. I, p. 50, PI. V, Fig. 13—21, PI. XX, 



Fig. 18 — 20. 



