TATTERSALL— MYSIDACEA AND EUPHAU8IACEA 131 



u, surface, three; v, surface, two; w, surface, two; y, surface, four; aa, 900 — Ofins., 

 twelve; bb, 140 — Ofms., four; ee, surface, ten; gg, surface, eight; hh, surface, seven; 

 kk, 250 fms., twenty-four, 300 fms., thirteen; 11, 750 fins., eighteen; mni, 400 fms., 

 sixteen ; nn, 200 fms., twenty-nine. 



21. Euphausia similis, G. 0. Sars. 



E. similis, G. 0. Sars, 1883. 

 E. similis, G. O. Sars, 1885. 

 E. similis, Hansen, 1910. 



Stations. C, 1200 — Ofms., seven; F, 50 fms., one, 100 fms., one, 150 fms., one; 

 N, 600— Ofms., twelve; p, 500 fms., three; q, 1000— fms., seven; s, 250— Ofms., five, 

 750 — 500 fms., three; aa, 900 — Ofms., ten; kk, 250 fms., three; 11, 750 fms., nineteen; 

 mm, 400 fms., four; nn, 200 fms., fifteen. 



These specimens belong to the var. crassirostris described by Hansen (1910). 



22. Euphausia hemigibha, Hansen. 



E. hemigibha, Hansen, 1910. 



Stations. C, 1200 — Ofms., ten; N, 600 — Ofms., one male, two females; c, 225 — 

 300 fms., three males, four females; s, 750 — 500 fms., one male; y, surface, two males; 

 11, 750 fms., two; mm, 400 fms., one male, one female. 



Hansen (1910) has lately divided the species E. gibba into four species, mainly on 

 the structure of the copulatory organs on the first pleopods in the male. Females are 

 extremely difficult or almost impossible to name accurately but from an examination of 

 every male of the gibba group in this collection it appears that only two species of the 

 group, this and the following one, are represented. 



I should mention that the specimens recorded by me from the Mediterranean (1909) 

 as E. gibba are in the light of Hansen's work really referable to this form. 



23. Euphausia. par agibba, Hansen. 



E. paragibba, Hansen, 1910. 



Stations. C, 1200 — Ofms., eighteen; L, 125 fms., one male; N, 600 — Ofms., five 

 males, five females ; Q, surface, two males ; p, 600 fms., three ; q, 1000 — fms., two males, 

 one female ; r, 500 — 250 fms., one male, two females; s, 250 — Ofins., one female, 750 — 

 500 fins., two males; v, surface, one male; y, surface, seven males; kk, 300 fms., two 

 males, one female; 11, 750 fms., thirty-two; mm, 400 fms., five males, three females; 

 nn, 200 fms., seven males, two females. 



This species, a Pacific form according to Hansen, is evidently much more abundant 

 in the Indian Ocean than the last species, an Atlantic form. 



24. Euphausia tenera, Hansen. 



E. gracilis, G. 0. Sars, 1883. 

 E. gracilis, G. O. Sars, 1885. 

 E. tenera, Hansen, 1905. 



17—2 



