24 Carl Bovallius, 



Triscliizostoma llascliii. A. BOEGK, 1860. 



Syn. ISOO. Triscliizostoma Rascliii. A. BOECK. Forliandl. ved c\v. Skaiuliiiaviskc Natur- 



forskercs 8:de Mode. p. 637. 

 1870. ,, ,, ,, "Crustacea anipliipoda borealia ct arctica». 



p. 11. in Christ. Viden.sk. Selsk. For- 

 liandlinger for 1870. 

 1872. ,, „ ,, De skandinaviskc og arktisko Aniphipn- 



der. p. 97. 4:to. 



Diagn. Capnt cum rostro segmento jirimo peroii brevius. 



Antenncp priini paris flagcllo doccm-articulato, articulo primo sequentibus lou- 



gitudino oequantc. Flagollum socundarinm tri-articulatnm. 

 Genu paris sceundi pcdnni pcrcii ])orl<)ugum, longitudino oarpuni .^upcraus; 



dactylo mininio. Ti])ia paris fjuarti longitudinem fenioris a?quans. 

 Epimcra segmentonuu sceundi, tertii ct ({uarti perniagna, epimerum segnicnti 



sceundi maximum, triangulatum. 

 Pedes uri sceundi paris a])iecm ultimi ])aris attingentes. 

 Tclsou rotundatum, pcduneulo pedum uri ultimi paris longius. 



The head witli the rostrum shorter than the first pereional segment. 



The flagellum of the first pair of antennw ten-jointed, the first 

 joint as long as the following together. The secondar}?^ flagellum is 

 three-jointed. 



The genu of the second pair of pereiopoda is very long, longer 

 than the carpns; the dactylus is very small. The tibia of the fourth 

 pair equals the length of the femur. 



The epimerals of the second, third, and fourth segments are ver}^ 

 large, that of the second segment is the largest, triangular. 



The second pair of uropoda reach to the end of the third pair. 



The telson is rounded, longer than the peduncle of the last pair 

 of uropoda. 



The description of Boeck is not quite accurate; it seems that he 

 has taken some characteristics from the adult animal and others from 

 very young ones; the drawings given by him do not always agree with 

 his description; on this account it seems convenient to give here also 

 figures of some details of a younger specimen for comparison with the 

 same organs in the adult animal. The specimens described here were 

 taken by me at »Tjotto)), Northern Norway, from a depth of 80 fathoms 

 July 1871, and in ))Hardanger fjord)) south-western coast of Norway, 

 July 1880. 



