DECAPODS 79 



MaxilHpeds produced to about middle of antennal scale ; first pair of 

 feet to end of antennal peduncle ; second pair to a little beyond the 

 maxillipeds ; the last pair of feet to the end of the maxillipeds. 



The abdomen is strongly geniculated or bent at a right angle at the 

 third segment, which is posteriorly produced and compressed, forming 

 a smooth, rounded carina. The first to fourth segments are without 

 spines or spinules ; the sixth is more than twice as long as wide, but 

 shorter than the seventh, which is narrow and has 4 spinules on each 

 side. 



Male. — The thickened portion of the outer antennular flagellum ex- 

 tends nearly to the end of the antennal scale. 



This species is very near S. gracilis, from which it differs in the longer 

 basal scale of the antennula, in the lower position of the pterygostomian 

 spine, in the presence of epipods on the maxilliped and first two pairs of 

 feet. 



Dimensions.— ?, length 54 mm., of carapace and rostrum 20 mm., of 

 rostrum 11.5 mm. 



Distribution. — Yxova Bering Sea to Drake Bay, California: 



Bering Island, one specimen from stomach of Gadus macrocephalus (N. 



Grebnitzky). 

 Alaska, probably Bering Sea (U. S. R. S. Cortvin). 

 Nazan Bay, Atka (W. H. Dall). 



Albatross stations : 

 Off Pribilof Islands, 20 fathoms, station 3438. 

 Off Rat Islands, Aleutians, 55 fathoms, station 3599. 

 Iliuliuk Harbor, Unalaska, 93 fathoms, station 3335. 

 Off North Head, Akutan Island, 72 fathoms, station 2842. 

 Off south entrance to Akutan Pass, 45 fathoms, station 2843. 

 Unimak Pass, 34 and 50 fathoms, stations 3220, 3222, 

 Northwest of Unimak Island, 43 fathoms, station 3262. 

 South of Unimak Island, 42 fathoms, station 3217. 

 15 miles south of Sannak Islands, 44 fathoms, station 2846. 

 Shumagins, 21-58 fathoms, stations 2850 (type locality), 2851, 2852. 

 Drake Bay, California, 35 fathoms, station 3155. 



SPIRONTOCARIS AMABILIS (Lenz). 



Hippolyte amabilis Lenz, Zool. Jahrb., Syst., xiv, 432, pi. XXXII, figs. 2, 3, 

 1901. 



Bare Island, British Columbia (type locality). 



SPIRONTOCARIS DECORA Rathbun. 

 Spirontocaris decora Rathbun, Proc. U. S. Nat. Mus., xxiv, 896, 1902. 



Female. — Carapace crested on its anterior half ; rostrum longer than 

 the carapace, armed with 4 or 5 teeth above, of which one or two are on 



