52 
S. I. Smith — Crustaceans of the Atlantic Coast. 
The right cheliped is stout and about as long as the whole body of 
the animal. The propodus is minutely tubercular and somewhat 
pubescent on the outer and under sides, which together form a con- 
tinuous and strongly convex surface; the inner inferior angle is 
armed with small tubercles, but the distal margin, along the articu- 
lation with the carpus, is smooth and unarmed. The carpus is almost 
as long as the basal portion of the propodus, subcylindrical, without 
lateral angles, and its whole surface minutely tubercular and clothed 
with dense, but very fine and soft, light-colored pubescence. The 
basal portion of the propodus is pretty nearly as broad as long, flat- 
tened vertically, evenly convex above and below, with the lateral 
margins rounded, and the whole surface, except a small space near 
the base beneath, as well as the basal portion of both fingers, tuber- 
culated and clothed like the surface of the carpus. The digital por- 
tion of the propodus is rather slender and tapers rapidly to the 
calcareous tip, so that its prehensile edge has an oblique direction 
toward the right. The dactylus corresponds in form with the digital 
portion of the propodus and is about as long as the inner margin of 
that segment. The prehensile edges of both fingers are nearly 
straight and armed with a few, low and obtuse tubercles. The left 
cheliped is very slender, about three-fourths as long as the right, and 
the carpus and propodus are less tubercular than in the right, but are 
clothed with a similar dense pubescence. The propodus is but little 
longer than the carpus, is scarcely as broad and considerably thinner. 
The digital portion, as well as the dactylus, is nearly as long as 
the basal, slender, and slightly curved downward at the tip. The 
tips of both fingers are horny, their prehensile edges sharp, but the 
rest of the surface rounded and naked, except for the scattering fas- 
cicles of short setm arising from little pits in the surface. 
Both pairs of ambulatory legs reach far beyond the tip of the right 
cheliped and, except the dactyli, are smooth and almost entirely 
naked. The second pair are a little longer and slightly stouter than 
the first but do not differ in other respects. In both pairs the carpal 
segments are about half as long as the meral and reach to the distal 
extremity of the carpus of the right cheliped ; the propodal seg- 
ments are slightly longer than the meral. The dactyli are consider- 
ably longer than the propodi, slender, strongly curved, particularly 
toward the very slender and acute tips ; they are compressed 
laterally, the sides being nearly smooth and naked and having 
a very shallow, longitudinal groove extending to the strongly 
curved terminal portions which are still more compressed and very 
