56 University of California Publications in Zoology  [Vou. 23 
Characters.—Carapace stout, carinated in its anterior half; posterior median 
spine situated at the anterior fourth of the carapace. Rostrum slender, half as 
long as the carapace, reaching just to end of first segment of the antennules, 
nearly horizontal, slightly sinuous; dorsal spines four, two of which are on the 
carapace; anterior two-fifths of rostrum unarmed above, armed below with three 
teeth on anterior third, one tooth close to the tip; except for the teeth the rostrum 
is scarcely limbed above or below. Basal scale of antennules about two-thirds as 
long as the first segment of the peduncle. Abdomen narrow compared with cara- 
pace; posterior margin of third segment is moderately produced; sixth segment 
one and one-half times as long as fifth, and a little more than one-half as long 
as the telson. 
Dimensions.—Type, female: length 39 mm., of carapace and rostrum 14 mm., 
of rostrum 5 mm. 
Type Locality—Off Sea Lion Rock, Washington, 685 fathoms (‘‘ Albatross’’ 
station 3071). 
Distribution—Has also been taken east of San Clemente Island, California, 
448 to 468 fathoms (‘‘ Albatross’’ station 4401; 1 @). 
Spirontocaris affinis (Owen) 
Hippolyte affinis Owen, in Zoology of Captain Beechey’s Voyage (in the 
‘‘Blossom’’), Crustacea, p. 90, pl. 27, fig. 4, 1839; Holmes, Occas. 
Papers Calif. Acad. Sci., 7, 194, 1900. 
Spirontocaris affinis Rathbun, H. A. E., 10, 77, 1904. 
Fig. 34. Spirontocaris affinis, lateral view of anterior portion (after Owen). 
Characters.—Depth of rostrum greater than one-third but not quite equal to 
half its length; rostrum shorter than the antennules but exceeding their peduncles; 
armed above with ten more or less evenly spaced, subequal teeth, the last three 
of which are on the carapace; armed below with about six teeth, all in front of the 
middle of the rostrum. The spine on the outer side of the base of the antennules 
exceeds the first segment of the peduncle in length. Fifth segment of abdomen 
laterally unarmed. 
Dimensions —Type: length 38 mm. 
Color.—Red (Owen). 
Type Locality.—Monterey, California. 
Remarks.—Has not been reported since Owen’s original description. 
