Boone, Crustacea, Cruises of "Eagle'' and "Ara," 1921-28 81 



Material examined : One large specimen taken in the Bay Bis- 

 cayne, Florida, 1923, field tag 208. 



Technical description: Carapace oblong, nearly squarish, about 

 three-eighths of an inch wider than long, exclusive of prefrontal seg- 

 ment; with the median region much elevated, sloping towards the 

 frontal and lateral margins. The entire dorsal surface is paved with 

 coarse, flattish, irregular granules, from which arise very fine cilia. 

 Ciliae are also found sparsely in the interspaces between the granules. 

 These granules form small serrations along the frontal margin and 

 also on the anterior part of the lateral margins ; in front of the cervical 

 notch are about ten more sharply defined serrations. The lateral mar- 

 gins are approximately subparallel for the greater part of their length, 

 except that posteriorly they are slightly convergent with the postlat- 

 eral angles rounded. Anterior to the posterior margin there is a 

 slightly arcuate transverse groove across the greater width of the cara- 

 pace but not reaching the lateral margins. The cervical, cardiac and 

 urogastric grooves are clearly delineated; there is a well marked de- 

 pression at the outer curve of the cervical groove behind the orbit ; 

 another pair of depressions between the cardiac and intestinal re- 

 gions. The rostrum is coarsely granulated, slightly bilobed with a 

 pair of submedian, pointed teeth, each one confluent on the outer side 

 with the rounded anterolateral margins. 



The orbits are prominent, especially the superior inner orbital angle 

 and, a little less so, the inferior angle. The entire orbital margin is 

 crenulated. The eyestalks are stocky, nearly as wide as long, con- 

 stricted below the cornea, which is rather small. In life it is said to 

 be conspicuously striped longitudinally. 



The antennulae have the basal joint clavate, spinulose at each the 

 upper and lower distal angles ; the second joint about as long as the 

 first but much slenderer ; the third article is subequal in length to the 

 second but is much slenderer; the flagellum has the slenderer inner 

 whip as long as the third joint, and the outer whip is three-fourths 

 as long as the inner one. 



The antennae have the basal segment short, the outer distal angle 

 granulated or toothed and the inner distal superior angle produced 

 into a lobe which almost surrounds the anterior margin of the rostrum 

 and which is cut into three, occasionally four, prominent, divergent, 

 obtuse teeth on the anterior margin ; the second antennal joint is wider 

 proximally than long, with the inner lateral margin of the proximal 



