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Genus STYLOCHEIRON, G. O. Sars 



To this very interesting genus 5 species have been referred 

 by Sars, 2 by Chun, and Ortmann established aneighth species. 

 But it will be shown presently that one of the species erected 

 by Sars is only the immature stage of another of his forms, 

 to which one of the species established by Chun must be 

 referred as a synonym, while Chun's second species has been 

 established on adult or subadult spécimens of a species erected 

 by Sars on very young, less than half-grown individuals. The 

 resuit is that only 5 valid species are known ; 3 of thèse are 

 represented in the collection. 



17. Stylocheiron Suhmii, G. O. Sars 



Stylocheiron Suhmii, G. O. Sars, op. cit., p. 142, Pl. xxvn, 

 figs. 1-4 [Immature spécimens]. 



Stylocheiron longicorne , G. O. Sars, op. cit., p. 144, 

 Pl. xxvn, fig. 5 [Adult female]. 



Stylocheiron mastigophorum, Chun, op. cit., p. 144, Pl. ix. 



Localities.— Stat. 1639, 1 spécimen; stat. 1676, 1 spécimen; 

 stat. 1736, 3 spécimens; stat. 1749, 1 spécimen; stat. 1802, 

 6 spécimens; stat. 1849, about 3o spécimens; stat. 1 856, 

 6 spécimens. 



Remarks. — Some of the spécimens are not adult, and 

 they agrée completely with S. Suhmii as figurcd by Sars, while 

 the adult female agrées with his représentation of S. longicorne. 

 — Chun states that in his S. mastigophorum the maxillipeds — 

 which he names first pairof legs have the endopod one third as 

 long again as the exopod, but according to his fig. 1 0 it is 3/2 as 

 long as the last-named branch ; according to fig. 1 1 the first 

 pair — his second pair — of legs has the endopod about 2 i/3 

 as long as the exopod, while in the text he lays stress on the 

 great différence of length without giving the proportion. Fur- 

 thermore he points out that on Sars' figure of S. longicorne 

 the endopods of the two pairs mentioned are only about as 



