80 RATHBUN 
the carapace, the anterior tooth in front of the middle of the rostrum. 
Rostrum not deep, but less slender than in SS. gracilis and S. flexa, a lit- 
tle concave 
above, but: 
nearly hori- 
zontal ; lower 
limb narrow- 
ing distally 
from near 
the posterior end, provided with 6 to 8 teeth; tip 
acuminate, reaching nearly to or beyond the an- 
tennal scale. Antennal and pterygostomian spines 
present, both well developed. 
Antennular peduncle between one third and one 
half the length of the antennal scale; spine at base 
reaching about to end of first segment. Thick- 
ened part of outer flagellum not reaching end of 
antennal scale; inner flagellum twice as long as 
outer. Outer margin of antennal scale as long as the carapace; pedun- 
cle extending as far as the end of the second antennular segment. Max- 
illipeds extending beyond middle of antennal scale. 
The posterior margin of the third abdominal segment is produced 
backward in the middle, and the segment itself is posteriorly prominent 
but not laterally pinched or carinated as in allied species. The sixth 
segment is more than twice as long as wide, and a little longer than 
the seventh, which has 5 to 7 pairs of lateral spinules, and is shorter 
than the uropods. 
Male.—The thickened part of the outer flagellum of the antennula 
extends to the end, or nearly to the end, of the antennal scale; the inner 
flagellum is correspondingly long. 
Dimensions.—Approximate length of @ 47 mm., length of carapace 
and rostrum 16.4 mm., of rostrum g mm. 
Distribution.—From Strait of Fuca to San Diego, California; 50 to 171 
fathoms. Dredged by the A/satross at the following stations: 



Spirontocarts decora. 
Fic. 33. 
Station 2946. 
@ (X 3). 
Strait of Fuca, 152, 114 fathoms, stations 3454, 3461. 
Near Flattery Rocks, Washington, 171 fathoms, station 2866. 
Heceta Bank, Oregon, 50 fathoms, station 2886. 
Off Point Conception, California, 145 fathoms, station 2893. 
Off Santa Cruz Island, California, 150 fathoms, station 2946 (type local- 
ity). 
Off Santa Rosa Island, California, 52 fathoms, station 2956. 
Off San Diego, California, 124 fathoms, station 2935. 
