54 University of California Publications in Zoology  [Vou. 23 
Spirontocaris bispinosa Holmes 
Spirontocaris bispinosa Holmes, Oceas. Papers Calif. Acad. Sci., 7, 207, 
1900; Rathbun, H. A. E., 10, 68, fig. 23, 1904. 
Fig. 30. Spirontocaris bispinosa, 2, lateral view of carapace, X 2 (from Rath- 
puny Unis iN MM.) 
Characters.—Rostrum a little longer than remainder of carapace. Distal half 
of rostrum a slender, styliform process, with a strong upward trend, devoid of 
teeth above and with a single tooth below. Basal half of rostrum high and 
laminate, continued backward over the anterior two-thirds of the carapace as a 
carina, armed above with ten to twelve teeth which decrease in size and become _ 
more closely set anteriorly, there being several small teeth crowded together where 
the rostrum is abruptly narrowed; the two posterior dorsal teeth are the two 
median spines of the carapace proper; below the basal half of the rostrum is 
armed with three or four low teeth. First three abdominal segments laterally 
rounded. Dactyls of ambulatory legs about one-half as long as their propodi. 
Dimensions.—Of an ovigerous female, approximate length 59.5 mm., length of 
carapace and rostrum 25.2 mm., of rostrum 14.8 mm. (Rathbun). 
Type Locality—Puget Sound. 
Distribution—From Yes Bay, Alaska, to off San Diego, California, 13 to 211 
fathoms. 
Spirontocaris snyderi Rathbun 
Spirontocaris snyderi Rathbun, Proce. U. 8S. Nat. Mus., 24, 894, 1902; 
H. A. E., 10, 69, fig. 24, 1904. : 
Fig. 31. Spirontocaris snyderi, 2, lateral view of carapace, X 244 (from Rath- 
bun, U. S. N. M.). 
Characters.—Median spines of the carapace proper three or four; between 
these spines and the small ones on the rostrum there is a considerable space; 
rostral teeth five or six above and three or four below. Rostrum a little shorter 
than remainder of the carapace, much the shape of that of S. bispinosa except 
that the mid-rib is more rapidly ascending and ends in a short point and that the 
upper lamina is more shallow and of rather even depth. First three abdominal 
segments laterally rounded. Dactyls of ambulatory legs one-third as long as their 
propodi or less than one-third. 
