Boone, Crustacea, Cruise of ''Alva," 1931 163 



lateral than the others. The second pair of frontal teeth are separated 

 by a U-shaped sinus from the inner pair of teeth and by another 

 similar sinus from the outer, or preorbital pair of teeth. The second 

 pair of teeth are wider than the submedian pair and each one is dis- 

 tally cut into eight sharp spinules, the inner six being quite small and 

 clustered together, and two much stronger spinules on the outer side ; 

 the outermost, or preorbital tooth is about as wide as the second tooth 

 and has its distal margin cut into three strong spinules, the innermost 

 of which is the largest of the entire frontal series. The superior 

 orbital angle is finely spinulose ; the postorbital angle is a five-spined 

 tooth and the inferior orbital margin has six rather coarse spines, the 

 innei-most two of which form the inferior inner orbital angle, and are 

 partially visible in a dorsal view, lying below the superior inner orbital 

 angle. The anterolateral margin is rounded and bears seven sharp 

 procurved spines, besides the postorbital tooth, the first, third and fifth 

 of these are much longer and occasionally bifid while the other four 

 are quite small. The anterolateral and postlateral margins are con- 

 fluent, the postlateral margins being convergent posteriorly. The pos- 

 terior margin is short, only two-thirds as wide as the frontal margin. 

 The dorsal surface of the carapace is flattish, very little convex, the 

 regions not defined except for a lightly impressed urogastric sulcus. 

 There are three or four small spinules in the transverse series across 

 the mesogastric region. There are two spines in curved series on the 

 epibranchial region in line with the second anterolateral spine and 

 about the same size. Another solitary spine occurs on the meso- 

 branchial region, in line with the four anterolateral teeth but much 

 smaller than these. The entire dorsal surface of the carapace is fur- 

 nished with numerous, rather regularly spaced, upstanding setae, set 

 about a millimeter apart. The pterygostomian region is smooth except 

 for the excurrent ridge. The upper margin of the buccal cavern is 

 set with a series of eight clusters of spinules, each cluster consisting 

 of two to six spinules. The female belt is oval, setae-fringed, seven- 

 segmented. The egg-mass of the present specimen consists of ap- 

 proximately 800 to 1,000 small, spherical eggs. 



The present specimen has only one full-size cheliped, the other 

 being in process of regeneration. The cheliped has the merus short, 

 trigonal, with the exposed upper distal end spinose; the carpus is 

 rounded and covered with sharp procurved spines; the propodus is 

 rather slender, laterally compressed with the outer surface moderately 

 rounded, the lower half smooth, the upper half of the outer surface 



