A REVIEW OF THE MYSIDACEA 43 



does not mention the pleopods in his type beyond the general state- 

 ment that they are the same as those in P. armiger, and it is incon- 

 ceivable that he should have overlooked the biramous nature of the 

 pleopods in the female unless the exopods, which are slender and very 

 delicate, were broken off in his specimens. This is what I assume, 

 for the moment, to have happened. The other characters of my 

 specimens are so similar to those of P. oculatus that I hesitate to 

 institute a new species on characters which may possibly be due to 

 injury to the type specimens. Further material must be awaited before 

 the matter can be satisfactorily cleared up. 



Genus HANSENOMYSIS Stebbing 



Arctomysis Hansen^ 18S7, p. 210. 

 Hansenomysis Stebbing, 1893, p. 268. 



HANSENOMYSIS FYLLAE (Hansen) 



Arctomysis fyllae Hansen, 1887, p. 210, pi. 7, figs. 5-51. 



Hansenomysis fyllae Hansen, 190Sa, p. 96, pi. 4, figs. 4a-k. — Tatteksall, 1911b, 

 p. 25. 



Occurrence. — East coast of the United States : Albatross station 

 2186, 1 adult female with young in the brood pouch, 18 mm. 



Distribution. — This is the first record of this species from the waters 

 of eastern America. It is known from Greenland, Iceland, and the 

 Atlantic slope of the west of Ireland in 80 to 795 fathoms. 



Genus SCOLOPHTHALMUS Faxon 



Scolophthalmus Faxon, 1893, p. 219. 



The only species of this genus so far found in American waters is 

 Scolophthalmus lucifugus Faxon. 



SCOLOPHTHALMUS LUCIFUGUS Faxon 



Synonymy and distribution records of this species will be found 

 on page 243. 



Genus CERATOMYSIS Faxon 



Cer atomy sis Faxon, 1893, p. 220. 



CERATOMYSIS SPINOSA Faxon 

 Ceratomysis spinosa Faxon, 1893, p. 220 ; 1895, p. 228, pi. 55, fig. 2 ; pi. 56. 



Occurrence. — West coast of North America : Albatross station 

 2859, 1 male, 30 mm. Japan: Albatross stations 4915, 1 female, 28 

 mm. ; 5050, 1 female, 28 mm. ; 5082, 1 male, 35 mm. 



Distribution. — C. spinosa was known previously only from the type 

 specimen from 782 fathoms off the Gulf of Panama. The specimens 



