, 
434 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
and armed with a stout tooth near the middle of the prehensile edge. 
The dactylus is as long as the basal portion of the propodus, about three- 
fourths longer than the propodal digit, strongly curved toward the tip, 
and the prehensile edge is sharp and minutely crenulate, but not toothed, 
and closes by the inner side of the tip of the propodus. The smaller 
cheliped is similar in form to the larger, but is considerably shorter and 
very much more slender, and the propodal digit is proportionately longer 
and its prehensile edge thin and minutely multidentate. Both chelz 
are sparsely hairy on the digits and very slightly along the margins of 
the basal portions. The second pair of legs are very slender and a little 
longer than the carapax; the merus is about as long as the carpus and 
chela taken together; the carpus is less than half as long as and slightly 
narrower than the merus and about three times as long as broad; the 
chela is slightly longer but scarcely broader than the carpus, and the 
digits are slender, longitudinal, not gaping, and a little shorter than the 
basal portion. The third and fourth pairs of legs are very nearly alike, 
and as long as the second, but more slender; the merus is about as long 
as the carpus and propodus together; the propodus is about a third 
longer than the carpus; and the dactylus is slender, nearly straight, and 
about two-fifths as long as the propodus. The fifth, or posterior, legs 
are considerably shorter and much more slender than the third and 
fourth pairs, being nearly cylindrical; the merus is about as long as the 
propodus; the carpus about three-fifths as long; the dactylus is about 
half as long as the carpus. 
The abdomen is much narrower than the carapax and not expanded 
in the middle, the sides being nearly straight and parallel. The lamelle 
of the uropods are about as long as the telson, the outer as long as 
broad, the inner a little narrower. The telson is about a third longer 
than ‘the sixth somite of the abdomen, about two-thirds as broad as 
long; the lateral edges are nearly parallel and each armed with about 
four small spines; the posterior margin is regularly arcuate. Near the 
middle of the dorsal surface there is a transverse line of four small spines, 
and there are one or two more between these and the tip. 
An imperfect male specimen, wanting the chelipeds and most of the 
abdomen, has three spines in front on the dorsal carina, and the spines, 
of the rostrum slightly longer than in the female. 
The single female gives the following: 
mm. 
ihengthifrom tip of rostrum: to) tipiof telson! 2-5 > -6--.--ceeicewiese sem -e)- eee 44.0 
Menephof carapax 10) biprotTOstram jess ee eee ee ete eee areca sel eee eee 16.3 
Menacghiof TOStUIMN : cc.. sociece bec aaeioecows ce tck ce ceebeseeroeee esc rise ccaesceee 3.1 
Hoisht Of CaTapax .. 2. ..sceccnecccenench ee sobs seccses teres Mee ene tac soe oeE ree 8.2 
Breadth of carapax.......... Ap h aE ERS EE ANCE hee RRS Aenea ert ta S as & 7.0 
Weng bhtotmiphticheliped! =f eee. se ese eee ee eee essen s eat nc eee 31.0 
Henothvotletgcheliped 2.00.4) c-meeve deeds Bek cette eee on cement 25.0 
Hhenothrol mio bt Merase s = 2/025 os een se a pes cene + cee he eee sits Cie a eneeeaee 8.3 
Geneth Otters WexGs Seis... Sec oscne ohcosa Saaeeee cease na Sac ele eee 7.0 
Menoth ofroenppropoduss--o.4-cs¢ sapere ees BS AUS ANS carne ee eee 12.5 
