NKW CRAYFISHES FROM FLORIDA — HOBBS 397 



with, the mam shaft, and extending beyond the posterior margin of 

 the appendage. The cephaHc process is elongate, extending beyond 

 the rest of the appendage distaliy, and somewhat hooding the central 

 projection anteriorh^. The central projection, entirely corneous, is 

 made up of two fused processes: The centrocaudal process, contributed 

 from the lateral base of the cephalic process forms the caudal entity 

 of the central projection; the centrocephalic process arises from the 

 center of the organ and makes up the cephalic entity of the central 

 projection. The whole process is bent caudad at a right angle with 

 the main shaft. The caudal process, also corneous, is a long, curved, 

 bladelike structure forming the posteromesial margin of the tip of 

 the outer part. It is somewhat convex mesiallj' and it is continuous 

 distad v,'ith the mesial and anterior controcephalic process of the 

 central projection. 



Alale (form //).-— Only slightly different from the male of the first 

 form. The hooks on the ischiopodites of the third and fourth walking 

 legs are very much reduced. The epistome is more regular, with 

 only a single medial crenation. The other differences are minor 

 variations and need not be pointed out. 



Female allotype. — Tlie female is veiy similar to the male of the 

 first foi-m, differing greatly only in the secondary sexual characters. 

 The sternum just anterior to the annulus ventralis, between the 

 fourth pereiopods bearing large multituberculate (three to five 

 tubercles) processes, which almost fuse along the midventral line. 

 (This character alone easiij' separates the female C. pallidus from 

 C. lucifugus lucijugus.) Just posterior to the annulus the knoblike 

 structure between the fii'th pereiopods is small and quadrituber- 

 culate. Epistome more regular than in the male, form I, with only 

 a single medial crenation. 



Annulus ventralis movable. Sinus arises anteriorl}^ along the mid- 

 ventral line and extends to the loft for a short distance, then bends 

 sharply to the right, finallj^ curving gently posteriorly, termmating 

 slightly to the right of the midventral line. 



Measurements. — The holotype: Carapace, height ].4, width 1.71, 

 length 3.47 cm.; areola, width 0.05, length 1.41 cm.; rostrum, width 

 0.37, length 0.76 cm.; abdomen, length 3.32 cm.; right chela, inner 

 margin of palm 1.14, width of palm 0.69, length of outer margin of 

 hand 3.35, length of movable finger 1.92 cm. The allotype: Carapace, 

 height 1.41, width 1.72, length 3.55 cm.; areola, width 0.08, length 

 1.42 cm.; rostrum, width 0.37, length 0.83 cm.; abdomen, length 3.34 

 cm. ; right chela, inner margin of palm 1 .14, width of palm 0.63, length 

 of outer margin of hand 3.32, length of movable linger 2.05 cm. 



Color. — This craj^^fish is almost snow white in life, turning dark only 

 after preservation. The animals live veiy successfully in aquaria and 



