NEW CRAYFISHES rRO:M FLORIDA HOBBS 401 



is composed of two corneous, subtriangular plates, the centrocephalic 

 and the centrocaudal, which arc flattened laterally. The caudal 

 process, which is also corneous, extends as a sharp ridge (convex 

 mesad) mesad of the central projection and it is directed proximo- 

 distad. The mesial, cephalic, and caudal processes are directed 

 almost parallel. 



Male {form II). — Essentially like first-form male; however, the 

 areola is slightly broader than in holotype. Two spines present in 

 each of the posterolateral corners of anterior section of telson. Hooks 

 on ischiopodites of third and fourth pereiopods reduced but strongly 

 developed. Antennae longer than body. (See fig. 17,/, j, for first 

 pleopod.) 



Female allotype. — Differs only slightly from the holotype. Anterior 

 section of telson with four spines in the right posterolateral corner 

 and throe in the left. Areola broader than in holotype. Other 

 differences may be noted in measurements. 



Faxon (189S, pi. 62, figs. 1, 5) figured the dorsal aspect of a female 

 and the annulus ventralis. (See fig. 17, i, for annalus ventralis of 

 allotype.) 



Measurements. — The holotype: Carapace, height 1.42, width 1.6, 

 length 3.52 cm.; areola, width O.Oo approximately, length 1.41 cm.; 

 rostrum, width at base 0.41, length 0.79 cm.; abdomen, length 3.35 

 cm.; right chela, inner margin of palm 1.21, width of palm 0.65, 

 length of outer margin of hand 3.38, length of movable fuiger 1.90 cm. 

 The allotype: Carapace, height 1.31, width 1.56, length 3.4 cm.; 

 areola, width 0.10 approximately, length 1.31 cm.; rostrum, width at 

 base 0.41, length 0.82 cm.; abdomen, length 3.10 cm.; right chela, 

 itmer margin of palm 0.85, width of palm 0.57, length of outer margm 

 of hand 2.84, length of movable finger 1.83 cm. 



Type locality. — Gum Cave, about 5 miles southwest of Floral City, 

 Citras County, Fla. This cave is also known by the names Sweet 

 Gum Cave and Gum Tree Caveni. The material which Faxon had 

 referred to C. acherontis in 1898 (p. 645) was also collected in Gum 

 Cave. It is on deposit in the United States National Museum and 

 consists of 2 females and 12 young (males, form II; females). He 

 described and figured the dorsal aspect of a female, the annidus ven- 

 tralis, and the first pleopod of one of the young males, form II. 



The male holotype (No. 77916), the female allotype (No. 77918), 

 and a second-form male paratypc (No. 77917) are deposited in the 

 United States National Museum. Of the remaining paratypes one 

 male, form I, and a female have been deposited in the Museum of 

 Comparative Zoology; one male, form I, and a female in the Univer- 

 sity of Michigan Museum of Zoology; 8 first-form males, 18 females, 

 2 immature males, and 1 immature female arc retained in my own 

 collection. 



