no. 3621 CRAYFISH FROM ALABAMA CAVES — HOBBS 3 



mere of peduncle of antennule; upper surface concave with scattered 

 punctations and shallow fovea at base; rows of setiferous punctations 

 mesial and lateral to margins, lateral row terminating cephalically at 

 base of acumen and mesial row continuing onto acumen. Subrostral 

 ridges moderately well developed and evident in dorsal aspect for 

 short distance at base of rostrum. Postorbital ridges weak, each with 

 shallow, setiferous, dorsolateral groove, and terminating cephalically 

 in corneous, acute, long spine. Suborbital angle obsolete. Branchi- 

 ostegal spine moderately well developed and acute. Surface of carapace 

 punctate dorsally and granulate laterally, three prominent cervical 

 spines on left and two on right. 



Abdomen longer than carapace (25.9 and 20.9 mm). Cephalic 

 section of telson with single long spine in each caudolateral corner. 



Epistome (fig. 6) broader than long, broadly rounded with very 

 weak cephalomedian projection. Antennule of usual form with spine on 

 ventral surface of basal segment distinctly distal to midlength. An- 

 tennae extending caudad beyond end of telson by distance almost 

 equivalent to length of telson. Antennal scale (fig. 9) 2.6 times longer 

 than broad with greatest width distal to midlength; lamellar area 

 distinctly broader than thickened lateral portion, latter bearing long 

 spine distally. 



Right chela (fig. 12) elongate, subovate in cross section, and with 

 palm slightly inflated; palm almost entirely tuberculate, tubercles 

 along mesial and lateral surfaces elevated; remainder, except that on 

 ventral surface just proximal to dactyl, mostly squamous; all with 

 setae extending distally; tubercles forming two or three irregular 

 rows along mesial surface of palm with 9 to 14 tubercles in each 

 row. Opposable margin of immovable finger with row of eight small 

 tubercles dorsally, extending from base to midlength of finger, single 

 large tubercle ventrally near midlength, and longitudinal row of 

 minute denticles (no more than three abreast) along almost entire 

 length; dorsal and ventral surfaces of immovable finger with median 

 longitudinal ridge, flanked, particularly dorsally, by setiferous punc- 

 tations; lateral margin of finger tuberculate proximally and punctate 

 distally. Opposable margin of dactyl with single large tubercle ven- 

 trally at base of distal three-fourths of finger and longitudinal row of 

 minute denticles along almost entire length; dorsal and ventral sur- 

 faces as on immovable finger and mesial surface similar to lateral 

 surface of immovable finger except basal tubercles slightly more 

 conspicuous. 



Carpus longer than broad (4.9 and 2.2 mm) with shallow oblique 

 furrow on dorsal surface; dorsal surface mostly punctate; mesial sur- 

 face with prominent acute tubercle distal to midlength and three or 

 four smaller ones proximal or ventral to large one; ventral surface 



