58 Bulletin Vanderhilt Marine Museum, Yol. Y 



The anterolateral margin is cut into four strong, proeurved, tri- 

 angulate primary teeth, in addition to the external orbital tooth. The 

 first anterolateral tooth also has a small secondary triangular, frontal 

 tooth at its base. There are no secondary teeth between the remain- 

 ing three anterolateral teeth. The fourth, or hindmost, anterolateral 

 tooth is smaller and more acute than any of the others and has a 

 carina running inward from its apex, curving slightly forward on the 

 outer portion of the carapace and then continuing as a nearly straight 

 carina clear across the carapace. There is also an interrupted, trans- 

 verse carina on the anterior portion of the gastric region and behind 

 it on the posterior gastric region, another short, unbroken transverse 

 carina, which is not quite as long as the interorbital space. The dorsal 

 surface of the carapace is otherwise smooth, except for scattered coarse 

 punctae, moderately convex, with no delineation of the regions except 

 a faint impression of the urocardiac pittings. The postlateral mar- 

 gins are as long as the anterolateral margins, decidedly convergent, 

 and are carinated; the posterior margin is also heavily carinated and 

 curves on either side above the base of the fifth leg. 



The sidewalls of the carapace are smooth, with a deep carina on 

 either side, extending from the upper, outer angle of the buccal cavern 

 to a point opposite the secondary tooth. The sternal plastron is wide 

 and smooth. The male belt has the first segment very narrow, hinge- 

 like, the second segment wider but also short and hinge-like, the third 

 article is quite long, composed of three completely fused articles, the 

 third, fourth and fifth segments, the next segment is nearly square 

 with the anterior margin recurved, the terminal segment is small, tri- 

 angular. 



The eyes are well developed. On the upper surface of the eyestalk 

 there is a calcareous plate that terminates in a thickened, rounded 

 margin. The cornea is large, terminally placed, hemispherical, with a 

 narrowed, tonguelike process extending outward upon its upper 

 surface. 



The antennulae are well developed and fold almost transversely 

 within the chambers which are separated by a well developed septum. 



The antennae have the peduncular article curiously produced into 

 a prominent, rounded tooth which extends outward, and protrudes 

 as far forward as the inferior inner orbital tooth, from which it is 

 separated by a wide sinus. Beyond this antennal tooth the distal 

 portion of the basal joint is produced into a curious, tonguelike proc- 



