58 University of California Publications in Zoology (Vou. 23 
Remarks.—F rom the great development of the supraorbital spines it would 
appear that this species is referable to the genus Alope White, from which it 
differs, however, in having a mandibular palp of only two segments instead of 
three as is characteristic of that genus. 
IV. Group with no supraorbital spines. 
Section a. Rostrum as long as or longer than remainder of carapace. (In this 
subgroup, with the exception of S. paludicola, the third maxillipeds do not exceed 
the antennal scale. In S. gracilis, flexa, carinata, and franciscana the third max- 
illipeds reach about to the middle of the antennal scale or only slightly beyond 
the middle. In S. decora they extend well beyond the middle and in S. kineaidi 
nearly to the end of the seale, but in neither do they quite attain its end or at all 
exceed it. In S. paludicola, mentioned above, the third maxillipeds slightly exceed 
the tip of the antennal scale. The length of the third maxillipeds of S. layi is 
not known.) (For section b, see p. 65.) 
Spirontocaris flexa Rathbun 
Spirontocaris camtschatica Rathbun, The Fur Seals and Fur-Seal Islands 
of the North Pacific Ocean, pt. III, p. 557, 1899, not S. camtschatica 
(Stimpson). 
Spirontocaris fleca Rathbun, Proc. U. 8. Nat. Mus., 24, 986, 1902; H. A. E., 
10, 78, fig. 32, 1904. 
Fig. 36. Spirontocaris flera, 9; a, lateral view of carapace and abdomen, 
xX 2%; b, dorsal view of anterior portion, X 3%, (from Rathbun, U. 8. N. M.). 
Characters.—Rostrum slender, armed with four or five teeth above, including 
one or two on the carapace, anterior tooth near middle of rostrum; anterior half 
of rostrum not limbed above; lower limb narrow and armed with from five to eight 
spines. Basal spine of the antennules extends beyond the first segment of the 
pedunele. The abdomen is strongly geniculated at the third segment, which is 
posteriorly produced and compressed, forming a smooth, rounded carina; sixth 
segment more than twice but not three times as long as wide, and shorter than 
the telson. | 
