2s^EW CRAYFISHES FRO^t FLORIDA HOBBS 413 



opposite the ninth tubercle, above which the movable finger passes 

 when the fingers are brought together. Minute denticles are scattered 

 along entire mesial margm. Lateral margin with a longitudinal ridge. 

 Entire finger setose-punctate. 



Carpus longer than broad, not quite so long as inner margin of palm 

 of chela. A sliallow, oblique, longitudinal groove above. Setose- 

 punctate dorsally, laterally, and ventrally. Setose-tuberculate 

 mesially. 



Merus with two spines on dorsodistal surface. xVbout 12 to 14 

 tubercles on ventrolateral margin; about 13 tubercles on ventromesial 

 margin, and about 5 on anteroventral margin. Lateral and mesial 

 surface sparsely punctate. Ventral surface setose-punctate. 



Ischiopodites of third and fourth pereiopods hooked. Hook on 

 third moderately strong; hook on fourth small and blunt. Caudo- 

 ventral margin of hook on the thiixl rounded, cephalodorsal margin 

 excavate and setose. 



Fii-st pleopod reacliing coxopodite of tliird pereiopod and terminating 

 distaily in four distinct parts, as follows: The mesial process, the 

 largest of the four, is a large corneous structure extending ventrally, 

 bent posteriorly at about a 50° angle with the main shaft and extend- 

 ing beyond the rest of the organ distaily. The cephalic process con- 

 sists of a noncorneous, knoblike stiucture bearing a crest of hairs, and 

 extending ventrally from the mesial margin of the knob is a small, 

 slender, corneous, truncate spine. The central projection, a small 

 corneous triangular process, compressed anteroposteriorly, consists of 

 two fused processes: a centrocaudal process (contributed from the 

 anterior process) forming the lateral part of the projection, and a 

 centrocephalic process rising from the center of the tip and forming the 

 mesial part of the central projection. The caudal process is somewhat 

 rounded and compressed laterally and extends in a ventrocaudal 

 direction bent at about a 45° angle with the main shaft. 



Male (form II). — Closely resembles the male of the first form but 

 much less robust; less tuberculate, and all processes and spines greatly 

 reduced. Hooks on iscliiopodite of third pereiopod reduced almost to 

 vestiges and absent on the fourth. Though all processes of the first 

 pleopod are present, none are corneous or so sharply defined as in the 

 male, form I. 



Female allotype. — The female differs only slightly from the male. 

 The chelae are not quite so heav3^ Epistome has been injured but 

 normal parts as in the first-form male. Annulus ventralis movable 

 and small. Sinus originates on anterior border near midventral line, 

 extends caudosinistrad, near midlength bends caudodextrad, then 

 turns gentlj" caudad to reach posterior margin at about midventral 

 line. Posterior to the annulus, and between the fifth pereiopods, the 



