80 RATHBUN 



the carapace, the anterior tooth in front of the middle of the rostrum. 

 Rostrum not deep, but less slender than in S. gracilis and S.flexa, a lit- 

 tle concave 

 above, but 

 nearly hori- 

 zontal ; lower 

 limb narrow- 

 ing distally FIG. 33. Spirontocaris decora. 9 (X 3). 



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 9 mm. 



Distribution. From Strait of Fuca to San Diego, California; 50 to 171 

 fathoms. Dredged by the Albatross at the following stations : 



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. 



