1921] Schmitt: The Marine Decapod Crustacea of California 53 
and dorsal margin minutely serrated, with spinuliform teeth, lower margin with 
four or five small simple teeth. Abdominal segments laterally rounded, except 
the fourth and fifth which have the posterolateral angle produced into an acute 
tooth. Dactyls of ambulatory legs about one-half as long as their propodi. 
Dimensions.—Type: length about 35 mm. 
Type Locality—Puget Sound. 
Distribution—From Bering Sea to Monterey, California, to 80 fathoms 
(Rathbun). Japan (Balss). 
Remarks.—To Kingsley’s figure one must add two or three supraorbital spines 
arranged in a longitudinal series. While three seems to be the normal number the 
anterior one is often reduced and sometimes wanting (Rathbun). Easily dis- 
tinguished from the other North Pacific lamelli-rostral species by serrate margin 
of dorsal teeth, and rostrum (Stimpson). 
II, Group with two supraorbital spines. 
Spirontocaris lamellicornis (Dana) 
Hippolyte lamellicornis Dana, Proc. Acad. Nat. Sci. Phila., 6, 24, 1852; 
Crust. U. S. Expl. Exped., 1, 576, 1852, pl. 36, fig. 6, 1855. 
Spirontocaris lamellicornis Holmes, Occas. Papers Calif. Acad. Sci., 7, 208, 
1900; Rathbun, H. A. E., 10, 62, fig. 18, 1904. 
Fig. 29. Spirontocaris lamellicornis, 2, lateral view of carapace, X 135 (from 
Rathbun, U. 8. N. M.). 
Characters—Abdominal segments laterally acute. Rostrum with mid-rib 
horizontal or but slightly ascending, about three-fourths as long as the rest of 
the carapace, broad and lamellate, continued backward nearly to posterior margin 
of carapace. Median spines of carapace proper four, rather larger than the rostral 
teeth which number about six above; below there are two teeth, of which the 
anterior forms the lower of the two teeth forming the bifid tip of the rostrum. 
Dactyls of the last pair of ambulatory legs about half as long as their propodi. 
Dimensions.—Types: length 38 to 50.8 mm. 
Type Locality Dungeness, Straits of Fuca. 
Distribution.—This species occurs sparingly from Unalaska to Point Arena, 
California, 9 to 77 fathoms (Rathbun). 
Remarks.—The number of supraorbital spines for this species as figured by 
Dana is only one. This is either an error or an abnormality for an examination 
of all the U. S. National Museum material of this species fails to show any excep- 
tion to the rule of two supraorbital spines. Dana also has the first abdominal 
segment laterally rounded, which is only exceptionally the case; as a rule it is 
acute. 
