226 Bulletin Vanderbilt Marine Museum, Vol. VII 



frontal margin is cut into four teeth, in addition to the prominent, 

 tooth-like, preorbital angles, the median pair of teeth are greatly 

 reduced, blunt and close together, the submedian pair, large, tri- 

 angulate, subequal to the conspicuous preorbital angle and nearly 

 as long as the first anterolateral tooth. The superior orbital mar- 

 gin is wide, incised by two, narrowed triangular sinuses, with the 

 angles of these subacute. The postorbital tooth is a wide, con- 

 spicuous triangle, inbent toward the orbit, and somewhat longer 

 than the adjacent anterolateral spine. The inferior preorbital 

 spines are similarly prominent. The spinose process of the epi- 

 stome is also much in advance of the median frontal spines, being 

 nearly as long as those of the submedian pair. The anterolateral 

 margin is widely convex, cut into eight, short, acuminate, slightly 

 procurved, spine-like teeth, in addition to the postorbital tooth, the 

 eighth, or lateral spine, being 2.5 times as long as the next adja- 

 cent spine, polished, acuminate, with a conspicuous line of bead- 

 ing extending inward from it across the branchio-gastric areas, 

 as a continuous beaded line, which becomes less conspicuous in 

 the median area. The dorsal surface is only moderately convex, 

 with the cervical, gastric and cardiac grooves deeply impressed. 

 The entire dorsal surface is paved with a series of conspicuous, 

 low, rounded, granules, which are largest and most closely 

 crowded on the central portion of the carapace, here forming the 

 clustered granules into tuberculose groups, as shown in the illus- 

 tration of the type ; the granules becoming fewer on the anterior 

 fourth of the carapace, yet remaining abundant and conspicuous 

 here, extending even onto the lateral and frontal teeth. On the 

 cardiac, mesogastric and inner branchial areas these large gran- 

 ules tend to form oval clusters. The posterior margin is carinate 

 and confluent with the somewhat concave postlateral margins, 

 this carina continuing on the latter to the base of the lateral 

 tooth. Both the antero- and post-lateral margins bear a fringe 

 of setae, which on the anterior margin fills the interstices be- 

 tween the teeth. 



The external maxillipeds have the meral article of the endog- 

 nath with the distal margins rounded, but not produced. 



The basal antennal article fills the orbital sinus. 



The eyes are large, with conspicuous, hemispherical, black, 

 terminal cornea. 



