DECAPODS 149 
Family 4X/7/D2. 
Genus Axius Leach. 
AXIUS SPINULICAUDA Rathbun. 
Axius spinulicauda RATHBUN, Proc. U.S. Nat. Mus., xxiv, 886, 1go2. 
Carapace (rostrum included) measured in the middle line, as long as 
the first 5 abdominal somites, cervical groove deep, branchial groove 
indistinct. Gastric region traversed by 5 carinz, all of which fade out 
before reaching the cervical groove; the median extends along the basal 
third of the rostrum and is armed with 4 spines just behind the line of 

Fic. 90. A-xius spinulicauda. @ (X2). Station 3172. a. Carapace and 
antenne. 6. Swimming-fan. 
the orbits; the posterior of these spines is broken off in the unique type; 
the outer carine are a continuation of the side margins of the rostrum ; 
they, as well as the shorter intermediate carine, are unarmed. The sur- 
face is covered with rather distant scabrous granules. In front of the 
narrow median posterior lobe, the surface is compressed or pinched to 
form a short smooth ridge. The rostrum reaches the middle of the 
second joint of the antennular peduncle, is slightly deflexed, longitudinally 
channeled, sharp-pointed, armed with 5 spines on one side and 6 on the 
other. 
Eyes black, of the same diameter as the stalk, not reaching the middle 
of the basal antennular segment. The basal expansion of this segment 
has convex side margins, an antero-external spine, and reaches just beyond 
the middle of the segment; the second segment is a little longer than 
the third, and the two together are shorter than the first. The entire pe- 
