9 6 



CRUSTACEA MALACOSTRACA. 



Occurrence. The "Ingolf has only once taken this species. 



South-West of Iceland: St. 83: 62° 25' N. L., 28° 30' W. L., 912 fm.; 1 spec. 



Distribution. The "Thor" took a specimen west of the Hebrides: 57 46' N. L,., 9 55' W. L-, 

 young-fish trawl with 1500 meters wire out, thus at a depth of at most 350 to 400 fm. The species 

 was next known according to the literature from the triangular area between Gibraltar, the Azores 

 and the Canary Islands (Hansen), from the Indian Ocean (Alcock), the Fiji Islands (Ortmann), lastly 

 the Galapagos Islands in the tropical Pacific, the Gulf of Panama and off Central America (Faxon). - 

 It has thus an extensive distribution and must be referred to the mesoplankton like the previous species. 



B. Suborder Mysida. 



4. Hansenomysis Fyllae H. J. H. 



PI. IV, figs. 4 a— 4 k. 



1887. Arctomysis Fyllse H. J. Hansen, Vid. Medd. Naturh. Foren. Kjobeuhavu, for 1887, p. 210, Tab. VII, 



Fig. 5—5 1. 

 1893. Hansenomysis Fyllse Stebbing, Intern. Scient. Series, Vol. 74, p. 268. 



Occurrence. The "Ingolf" has twice taken this species. 



Davis Straits: St. 35: 65° 16' N. L.., 55° 05' W. L., 362 fm., temp. 3-6°; 2 spec. 

 - 27: 64° 54' - 55 10' - 393 - - 3-8°; 1 - 



Further, the "Fylla" has taken it in the Davis Straits, Admiral Wandel and the "Thor" near 

 the Faeroes; the localities are as follows: 



Davis Straits: 65 35' N. L,., 54 50'W. D., 80 fm., stones with Balani; 1 spec, (my type spec). 



South-West of the Fseroes: 61° 15'N. L., 9 35' W. L., 450—500 fm.; 10 spec. 



6i° 23' — 5 04' 255 fm., temp. o°; 1 spec. 



Distribution. This form is only known as yet from the localities mentioned. 



Characteristics of the Species. The genus and species were founded on a single, adult, 

 damaged female; as I now possess fairly good material, additional details to my previous description 

 may be given here. 



In well-preserved specimens the carapace shows a certain and sometimes very considerable 

 solidity with characteristic, well-marked furrows as represented in fig. 4 a. The central two-thirds of 

 the anterior margin seen from above (fig. 4 c) is flatly convex, seen from the side considerably bent 

 upwards; each lateral portion forms a tolerably short wing, the anterior lateral margin of which is 

 somewhat oblique, considerably convex above and reaching further forward than the central part of 

 the carapace. Posteriori)- the carapace is somewhat emarginate so that the hind upper part of the 

 fifth thoracic segment is uncovered; the sixth and seventh thoracic segments (fig. 4 a; VI, VII) are 

 completely uncovered and firmly chitinised. The head projects very considerably forwards in front of 

 the carapace; seen from the side its upper profile is very concave, so that the front end projects 

 strongly forwards and upwards (fig. 4 a); seen from above the front end is considerably convex (fig. 4 c). 



