94 CRUSTACEA MALACOSTRACA. 



West of Iceland: St. 90: 64 45' N. L., 29o6'W. L., 568 fm.; i spec. 

 South-West of Iceland: St 17: 62 49' N. L., 26 55' W. L., 745 fm.; i spec. 



- 83: 62 25' 28 30' 912 ; i carapace. 



- 18: 6i44 r 30 29' 1135 ; i spec. 

 South of Iceland: 81.41: 61 39' N. L., 17 10' W. L., 1245 ^ m -i I spec. 

 West of the Faeroes: 81.42: 61 41' N. L,., ioifW. L., 625 fm.; i spec. 



Further, it has been taken four times within our region by the "Thor", three of the times in 

 the waters south of Iceland, whilst the fourth place was at 65oo'N. L., 28 lo'W. L., i. e. in the Irminger 

 Sea west of Iceland, yet a little more northerly than St. 90 "Ingolf". It was taken all four times in 

 the young-fish trawl and the amount of wire out varied between 1000 to 1800 meters, so that the real 

 depth in which the specimens were taken varied from ca. 200 to at most 450 fm., whilst the depth of 

 water at the stations varies from ca. 750 to over 1000 fm. 



Distribution. The "Thor" has taken the species to the west of the Hebrides and west of 

 Brittany (both times in the young-fish trawl and length of wire out respectively 1500 and 500 meters). 

 It is noted from several places in the northern temperate and tropical Atlantic (Sars, Caullery, Holt & 

 Tattersall, Hansen, Ortmann), from several places in the Indian Ocean (Alcock), south of Amboina, 

 in the Banda Sea (G. O. Sars' locality for G. Willemoesii), lastly from some places in the Pacific Ocean 

 (G. O. Sars, Faxon, Ortmann). 



To judge from the "Thor's" catches the species does not live at the bottom but in intermediate 

 layers. A specimen taken with 500 meters wire out, thus in a depth of at most ca. 125 fm., is quite 

 small and this is also the case with a specimen taken with 1000 meters wire out, whilst among the 

 specimens taken with 1500 meters wire out there is one somewhat more than half-grown, and among 

 those taken with 1800 meters wire out there is a large specimen. It seems to be the same here as 

 with Scrgcstes arcticus and 6". robustus, that small specimens are often at least found nearer the sur- 

 face than the larger and that the wholly developed specimens are always only met with in deeper layers. 



Remarks. The largest specimen is a female with marsupium (from "Ingolf ' Stat. 17) measuring 

 90 mm. from tip of rostrum to end of telson, whilst a male (taken by the "Thor") is 86 mm. long; 

 Sars' largest specimen was only 70 mm. The spine at the distal extremity of the squama of the an- 

 tennae usually reaches a little beyond this, but in the large female scarcely to the extreme end of the 

 squama; the outer edge of the spine is smooth without crenulations, aiid I have not seen such an 

 equipment of small teeth as is shown by Sars' fig. 9. The rostrum and especially the posterior process 

 of the carapace are relatively longer in small than in large specimens, which last form a transition to 

 G. Willemoesii G. O. S. as figured 1. c. PI. V, figs. 12. I believe that Ortmann is right in cancelling 

 G. Willemoesii as founded on large specimens of G. zoea; I have examined Sars' specimens of his 

 G. Willemoesii in the British Museum (Natural History) but notes on these specimens are postponed 

 to a future publication. 



On PI. IV I have represented (figs. 3 b and 3 c) the distal portion of both mandibles seen from 

 above and (fig. 3 a) the same portion of the left mandible seen from below, also the left maxillula 

 (fig. 3 d) and maxilla (fig. 3 e). The two last figures especially I believe to be of some interest, as they 

 show the segmental structure of these appendages and from which joints the various lobes arise, 



