62 University of California Publications in Zoology [Vou 28 
Spirontocaris carinata (Holmes) 
Heptacarpus carinatus Holmes, Occas. Papers Calif. Acad. Sci., 7, 202, 
pl. 3, fig. 60, 1900. 
Spirontocaris carinata Rathbun, H. A. E., 10, 84, 1904. 
Fig. 39. Spirontocaris carinata, lateral view of carapace and abdomen (after 
Holmes). 
Characters.—Rostrum deep, one-fourth as deep as long; armed above with 
four to six small teeth, the posterior one on the carapace, the anterior one a little 
behind the middle of the rostrum, below with four to six teeth, the anterior 
of which is commonly near the tip. Basal spine of the antennules reaches about 
to the tip of the first segment of the peduncle. Third segment of abdomen 
is posteriorly produced and crested; sixth less than twice as long as wide, and 
shorter than the telson. 
Dimensions.—Single specimen in the U. 8S. National Museum: length from 
tip of rostrum to end of telson 48 mm., of rostrum 9 mm., of carapace 9 mm., 
of telson 6 mm. 
Color.—Varies with surroundings. Specimens among bright green seaweeds 
are of a uniform bright green color, while the specimens living only a few yards 
away among the red seaweeds imitate almost exactly the color of the algae that 
surround them (Holmes). 
Type Locality—Monterey Bay, California. 
Distribution—From Monterey Bay, shallow water (Holmes), to Point Loma, 
California (‘‘Albatross’’ one specimen) (Rathbun). I have also seen a specimen 
dredged at Laguna Beach by Prof. W. A. Hilton in 10 to 15 fathoms. 
Remarks.—The eyes of this species are very slender. The antennular peduncles 
extend about one-third the length of acicle (Rathbun). 
