186 Bulletin, Vanderbilt Marine Museum, Vol. Ill 



tal under portion by an incision; the second and third joints suc- 

 cessively shorter, subcylindrical, the inner whip the longer, extending 

 nearly a quarter of an inch beyond the scaphocerite ; the outer whip 

 extends only a couple of joints beyond the scaphocerite. 



The antennae have a short proximal article with a small tooth at 

 the outer distal angle; the scaphocerite has the lateral margins sub- 

 parallel for the greater part of their length, the outer margin de- 

 cidedly thickened and terminating in a very sharp tooth; the distal 

 margin rounded and ciliated. The second article is short; the third 

 article is elongated, extending three-fifths the length of the scaphocer- 

 ite ; the flagellum is about half as long as the body. 



The first legs are subchelate, equal; the merus is narrowed proxi- 

 mally, thickened distally, with an acute spine on the upper distal 

 dorsal margin ; the carpus is small, with a spine on the outer ventral 

 distal margin ; the propodus is subcylindrical, dorsoventrally flattened, 

 this increasing distally, the inner distal angle produced into an out- 

 ward, flared, acute spine, the dactyl arising from the outer dorsal 

 angle, the margin between thin and convex, the curved acuminate 

 finger closing upon it. 



The second leg is very weak, subchelate. 



The third legs are exceedingly frail, long and slender, monodactyl. 

 The fourth and fifth legs are about as long as the third pair but are 

 less slender and have more cilia. 

 Synonymy. — Crangon norvegicus M. Saks, Nyt. Mag. f. Naturg, B. II, 



p. 248, 1861. 

 Pontophilus norvegicus M. Sars, ihid, B. i5, p. 242, tab. I, figs. 1-25, 



tab. II, figs. 17-37, 1868.— Hansen, Danish Ingolf Exped. Ill, pt. 



2, p. 53, 1908 (and references to major synonymy of European 



records). 



Genus: aegis Kroyer. 



Argis lar (Owen). 



Plate 70. 



Type: "Deposited in the Royal College of Surgeons and Zoologi- 

 cal Society" (London). "Collected during a voyage to the Pacific and 

 Behring's Strait in H. M. S. 'Blossom,' 1825-29." 



Distribution: Known from the Arctic coast of Siberia south to 

 the Kurile Islands; from the Arctic coast of Alaska southward to 

 Sitka; from the Okhotsk Sea southward to Robben Island (off Cape 

 Patience) and Iturup Island; the east, southern and west coast of 



