46 CRUSTACEA MALACOSTRACA. III. 



28. Pleurogonium spinosissimum G. O. Sars. 

 1866. Pleuracantha spinosissima G. O. Sars, Beretning om en Sommeren 1865 foretagen zool. Reise 



ved Kysterne af Christianias og Christianssands Stifter, p. 30. 

 ! 1897. Pleurogonium spinosissimum G. O. Sars, Account, II, p. 115; PL 48, fig. 2. 



Sars' representation of the female is very fine. The male, which he has not mentioned, is 

 much smaller than the adult female, with second to fourth thoracic segments considerably shorter, the 

 processes from the postero-lateral angles of second and third segments much shorter than in the female, 

 and not as long as broad, while the fourth segment has its lateral margins without any anterior or 

 posterior angle; all coxal processes nearly as in the female. Young females of the same size as the 

 males agree with them as to the processes of the segments. 



Length of an ovigerous female 2-5 mm., of a male from the same locality (Jan Mayen) 1-5 mm. 

 Sars has recorded 3 mm. as the length of the adult female. 



Remarks. In the marsupia of a good number of specimens from Iceland I found a species 

 of the family Choniostomatidae. 



Occurrence. Taken by the "Ingolf" at two stations. 



North of Iceland: Stat. 128: Lat 665o' N., Long. 2OO2'W., 194 fath., temp. o - 6; i spec. 



Stat. 126: Lat 67i9' N., Long. i532' W., 293 fath., temp. -=- 0-5; i spec. 



The species has never been found at Greenland, but is not uncommon at Iceland. At West 

 Iceland it has been taken by Mag. W. Lundbeck in 0nundar Fjord, 1112 fath., 22 spec., and Sars 

 recorded it from Reykjavik. At the east coast of Iceland it has been gathered by Mag. R. Horring 

 and Dr. A. C. Johansen in Bakka Fjord, 43 52 fath., and 13 15 fath., Seydis Fjord, 59 fath., Nord 

 Fjord, 40 fath., Faskruds Fjord, 2050 fath., and Breiddals Vik, 6 fath. The Ilnd Amdrup Exp. secured 

 a good number of specimens at Jan Mayen, and at the Faeroes it has been collected by Dr. Th. Mor- 

 tensen at Klaksvig, 10 15 fath. 



Distribution. Taken at Denmark in the northern half of the Sound |W. Bjorck) and Store 

 Belt, in Kattegat and Skager Rak, 16 and no fath. (H. J. Hansen); at the coasts of Norway from 

 Christiania Fjord to Vardo, 60 to 100 fath. (G. O. Sars), and at Cape Flora, Franz-Joseph Land, 30 fath. 

 (T. Scott). Finally recorded from the Firth of Clyde (Robertson) and east of Northumberland (Norman). 



29. Pleurogonium pulchrum n. sp. 

 (PL III, figs. 12 a 12 e.) 



Female (without marsupium). Surface of the head with two pairs of minute denticles in a 

 transverse row (fig. 12 b). -- First joint of the antennulae with a small spine at the middle of the front 

 margin and a somewhat long spiniform process a little from the end; flagellum 3-jointed, as in all 

 preceding species. - Third joint of the antennae with a very conspicuous, spiniform process vertical 

 on its outer margin a little beyond the middle, and a smaller process on the opposite margin. 



Each of the four anterior thoracic segments (fig. 12 a) has the lateral margins adorned with a 

 very long, slender and acute process, and besides with two to five very much smaller processes. On 

 first segment the large process projects from the antero-lateral angle, and behind it two or three acute 



