42 



CRUSTACEA MALACOSTRACA. III. 



Occurrence. Taken by the "Ingolf" at eight stations in the warm and three in the cold area. 

 Davis Strait: Stat. 32: Lat. 66°35' N., Long. 56°38' W., 318 fath., temp. 3-9°; 16 spec. 



— Stat. 35: Lat. 65°i6' N., Long. 55°05° W., 362 fath., temp. 3-6°; numerous spec. 

 Stat. 27: Lat. 64°54' N., Long. 55°io' W., 393 fath., temp. 3-8°; 2 spec. 



Stat. 25: Lat. 63°3o' N., Long. 54°25° W., 582 fath., temp. 3-3°; 10 spec. 



— Stat. 24: Lat. 63°o6' N., Long. 56°oo' W., 1199 fath., temp. 2-4°; ab. 28 spec. 

 West of Iceland: Stat. 89: Lat. 64°45' N., Long. 27°2o' W., 310 fath., temp. 8-4°; 1 spec. 

 South-West of Iceland: Stat. 81: Lat. 6i°44' N., Long. 27°oo' W., 485 fath., temp. 6-i°; 1 spec. 



Stat. 78: Lat. 6o°37' N., Long. 27°52' W., 799 fath., temp. 4-5°; 7 spec. 

 East of Iceland: Stat. 105: Lat. 6s°34' N., Long. 7°3i' W., 762 fath., temp. -^ o-8°; 2 spec. 

 North of Iceland: Stat. 126: Lat. 67°i9' N., Loug. i5°52' W., 293 fath., temp, -f- 0-5°; 8 spec. 

 Stat. 124: Lat. 67°4o' N., Long i5°4o' W., 495 fath., temp. ■+- o-6°; 1 spec. 



Besides it has been taken by the "Thor" at a single locality. 



South of Iceland: Lat 62°u' N., Long. i9°36' W., 1010— 1140 fath.; 3 spec. 



Pleurogonium G. o. Sars. 



Sars' account of this genus is excellent so far as it goes. He described three Norwegian 

 species; in the present paper six species are mentioned, three of which are new. 



It is necessary to examine the origin of the lateral thoracic processes found in the majority of 

 the species. In P. rubicund tun G. O. S. and P. intermedium n. sp. these lateral processes originate only 

 from the coxae of the legs and are epimeral processes, while in P. spinosissimum G. O. S. some of them 

 originate, as already observed by Sars in this species, from the segments and the others from the coxae, 

 while in P. pulchrum 11. sp. only the segments have processes and teeth. 



The males are much smaller than the full-grown females, as second to fourth thoracic segments 

 are much less expanded laterally, and these segments are, besides, conspicuously shorter in the males 

 than in subadult or adult females; the general aspect of the thorax differs therefore considerably in 

 the two sexes. Sars has not figured any male, but my fig. 9 a of the male of P. latimanum may convey 

 an idea of the general aspect of this sex. The first pair of thoracic legs are completely similar in 

 both sexes. The abdomen seems frequently, but not always, to be proportionately a little broader in 

 the male than in the female. The uropods are always dorsal, with the peduncle scarcely or not 

 distinguishable, and the inner ramus at most about half as long as, and much thinner than, the other. 

 The abdominal operculum in both sexes has been well figured by Sars, and in both cases affords 

 generic characters. 



Conspectus of the Species. 

 A. No lateral processes on the thoracic segments. 



a. No epimeral processes, at most a low tubercular protuberance on the coxse of the four anterior pairs. 



«. Hand of first pair of legs oblong-oval with the lower margin arcuate; terminal margin of 



the preceding, the fifth, joint not longer than seventh joint with claw 1. P. incrine G. O. S. 



