74 RATHBUN 
broader, the antennular scale, on the contrary, commonly longer than in 
Atlantic forms, in the ? often reaching the end of the peduncle, and in 
the ¢ sometimes the end of the second segment. ‘There is, however, a 
lack of constancy in these characters which prevents the separation of 
the stout form as a distinct species; it was described by Brandt as H. S¢. 
faul. Again, the rostrum may be only as long as the peduncle of the 
antennula, or reach nearly to the end of the antennal scale; it may be 
of greater or less depth and acuteness. From the variations at a single 
locality, Bate (/oc. cit.) described three species for which he constructed 
the genus He/airus. 
Distribution.—Circumpolar. Atlantic coast of North America south- 
ward to Cape Cod, 10-218 fathoms. Northern Europe. Bering Sea, 
Okhotsk Sea, Aleutian Islands eastward to Kadiak, to a depth of 283 
fathoms : 
Taken by the Albatross : 
Off Pribilof Islands, 25 fathoms, station 3558. 
Off Rat Islands, Aleutians, 55 fathoms, station 3599. 
Off Seguam, Aleutians, 283 fathoms, station 3480. 
Pumicestone Bay, 35 fathoms, station 3322. 
Northwest of Unimak Island, 41 and 43 fathoms, stations 3259, 3262. 
Northeast of Cape Leontovich, 22 fathoms, station 3275. 
Okhotsk Sea, 10 fathoms, station 3645. 
Collected by Dr. W. H. Dall at: 
Plover Bay, East Siberia, 10-25 fathoms. 
Near Indian Point, Bering Strait, 17 fathoms. 
Various localities along the Aleutian Islands eastward to Kadiak, 3-80 
fathoms. 
St. Paul Island, Pribilofs (William Palmer). 
Bering Island (L. Stejneger). 
Bering Island, among Laminaria (N. Grebnitzky). 
SPIRONTOCARIS UNALASKENSIS Rathbun. 
Spirontocaris unalaskensis RATHBUN, Proc. U. S. Nat. Mus., XXIV, 895, 
1902. 
Female.—Body rather robust. Carapace carinated in its anterior half; 
posterior median spine situated at the anterior third of the carapace. 
Rostrum longer than the carapace or the antennal scale, nearly horizontal, 
but slightly concave above, dor- 
sal spines 4 or 5, equally spaced, 
2 on the carapace and 2 or 3 at 
base of rostrum; no upper limb 
on distal portion, lower limb 
Fic. 28. Sfzrontocaris laskensis. Sid . 
Pete (ke) Beatin gaa arP#* shallow, convex, armed with three 
