1921 1 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 

 (Eathbun). Japan (Balss). 



Bemarks. — 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 (Eathbun). 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) 



Sippolyte lamellicornis Dana, Proe. Acad. Nat. Sci. Phila., 6, 24, 1852; 



Crust. U. S. Expl. Exped., 1, 576, 1852, pi. 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, 5, lateral view of carapace, X 1% (from 

 Eathbun, U. S. N. M.). 



Characters. — Abdominal segments laterally acute. Eostrum 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 Fuea. 



Distribution. — This species occurs sparingly from Unalaska to Point Arena, 

 California, 9 to 77 fathoms (Eathbun). 



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 TJ. 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. 



