56 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



male; 2083, 2 adult females; 2104, 1 immature female; 2190, 2 im- 

 mature specimens; 2193, 1 adult female and 1 immature specimen; 

 2195, 1 immature specimen; 2215, 1 immature specimen; 2229, 2 

 adult females; 2535, 2 adult females; 2428*, identified by S. I. Smith. 



Distribution. — The first actual record of this species from the eastern 

 coasts of America is that of the type specimen, which was taken by the 

 Challenger south of Nova Scotia in 1,250 fathoms. The species was 

 actually known to S. I. Smith as an American species, for the unre- 

 corded specimens in the National Museum collection from station 2428 

 were identified by him. It will be seen from the above long list of 

 records that the species is by no means rare in the deeper waters off the 

 eastern American coasts. It frequents deeper water than the other 

 two common species of the genus and it is probably bathypelagic 

 rather than bottom living. Waterman and his colleagues (1939) in- 

 vestigated the bathymetric distribution of this species at various times 

 of the day and night and found that it had a daily vertical migration 

 of 400 meters. 



Remarks. — In the bottle containing the specimen from Fish Hawk 

 station 1122 there is a label stating that the specimens were "coloured 

 orange." The adult female from Albatross station 2034 measures 

 28 mm. in length, larger than any specimen yet recorded. It differs 

 from the other specimens in that the rostral spine is almost obsolete and 

 the rostral plate has much more prominent shoulders than in more 

 normal specimens. I take these features to be a sign of old age. The 

 characteristic endopod of the second thoracic limbs of this species is 

 present in this specimen. 



BOREOMYSIS KOSTRATA IHigr ? 



Figures 11-13 



Boreomysis rostrata Ilijg, 1906a, p. 196, fig. 2 ; 1930, p. 414, figs. 22-35. 

 Boreomysis inermis Hansen, 1910, p. 26, pi. 2, figs. 4a-c. 



Occurrence. — Alaska : Albatross station 4765, 1 immature male, 16 

 mm. Japan : Albatross stations 3710, 2 adult females, 21 to 22 mm., 

 and 1 immature specimen, 14 mm. ; 4909, 1 adult male, 22 mm. ; 5063, 

 4 adult females, 25 mm. 



Distribution. — Hansen's specimen of B. inermis was taken in the 

 waters of the Dutch East Indies. The specimens which Illig referred 

 to B. rostrata were taken in widely separated localities in the Atlantic 

 and Indian Oceans. The type specimen was collected in latitude 

 30°6'7" S., longitude 87°50'4" E., northeast of New Amsterdam. The 

 species is thus at least widely distributed in the western Pacific as far 

 north as the Aleutian Islands, and has an even wider distribution if all 

 the specimens referred to it by Illig really belong to this species. 



