452 REPORT OF NEW JERSEY SHTATE MUSEUM. 



alternating, though sometimes with quite irregular appearance. 

 About middle of pollex along inner edge, and often also near 

 tip along same edge, an enlarged or slightly elevated tubercle. 

 Often several enlarged tubercles on inner edge of dactyl basally, 

 and nearly smooth or very slightly roughened or granular along 

 bas-e dorsally, though very short or obsolete longitudinal groove 

 variable. Palm wuth outer dorsal surface coarsely tuberculate 

 or rugose, at least over most of upper half, more granular over 

 median area, and minutely granular to obsolete or smooth be- 

 low. Upper and lower edges of palms externally with ridges, of 

 which former better defined and formed of larger wide-spaced 

 tubercles. Inner surface of palm with smooth broad ridge 

 extending forward toward dactyl, but as it turns down toward 

 lower basal edge of pollex strongly marked by irregular large 

 tubercles, especially about angle. Series of small tubercles ex- 

 tending along upper edges of inner carpal cavity in slightly curved 

 line. Along inner edge of palm at articulation of dactylus series 

 of small tubercles. Internally and extending down on inner edge 

 of pollex, along latter of which it also continues forward more 

 or. less, a series of rather enlarged tubercles, most conspicuous 

 just below articulation of dactylus. Inner surfaces of fingers 

 smooth. Upper anterior inner portion of palm largely tubercu- 

 late, though below it, and also below strongly marked obliquely 

 tuberculate ridge, smooth. Merus and carpus long, rough or 

 tuberculated on outer surfaces, and smooth on inner. Smaller 

 cheliped elongate, fingers a little longer than palm, also touching 

 tips. Ambulatory feet with second pair of feet longest, and all 

 feet more or less hairy in males, less so in females. Abdominal 

 segments in females two and one-half times wider than in male. 



Color mostly olive, paler or more or less brownish below. 

 Chelipeds of large development, often grayish or yellowish to 

 olive, and distinct red spots on processes at articulations, very dis- 

 tinct in males. Feet olivaceous basally and become brownish dis- 

 tally. Length of carapace i8 mm., width 25 mm. 



Remarks. — Distributed along our coastwise streams from 

 Cape Cod to Florida. According to Verrill it lives on the 

 marshes farther up the estuaries than the other species, as along 



