SOME NEW DEEP SEA CRUSTACEANS— BENEDICT. 281 



MUNIDOPSIS CYLINDROPUS, new species. 



[• The rostrum i.s sharp; the distal one-half is triangular in crots sec- 

 tion; it extends horizontally forward beyond the eyes by about one- 

 i half of its length. From the apex to the eyes the upper margin is a 

 I sharp ridg-e; from this point the ridge is forked, the branches running 

 I back to the front of the gastric areolation, inclosing a slight triangular 

 \ depression. The antero-lateral angles are right angles with shaip 

 j apices; that portion of the front which lies between the bases of the 

 antennae is much advanced beyond the line of the angles. 



The articles of the antennal peduncles are each about as long as 

 broad; the flagelli are long and thread-like, reaching 

 far beyond the chelipeds. 



The carapace is 5.5 mm. in )>readth and 6.5 mm. in 



i length, measured from the front behind the e3^e; the 



lateral margin is but slightly arcuate from the middle 



to the front, but much more so posteriorly. The 



i areolations are protuberant; the surface is everywhere 



I broken by raised transverse lines varying- greatlv in 



length. 



The chelipeds measure 20 mm. in length and are fig. 24.-munidop- 



I almost uniformly 1 mm. in diameter throughout, the ^'/ cylindkopus, 



i palm enlarging to 1.2 mm. at the base of the dactyl. 



The merus and carpus are granulated, while the palm is smooth and 



slightly iridescent; two spines arm the inner surface of the merus and 



two or three the distal margins of both merus and carpus. 



The lingers are shorter than the palm ; their prehensile edges are 

 thin and minutely dentate. The ambulatory feet are granulated; with 

 the exception of a small graduated comb under the dactyls thev are 

 free from spines. 

 The merus of the maxillipeds is armed with two spines. 

 The abdomen is wanting in both spines and tubercles; the margins 

 of the second, third, and fourth segments are raised, forming deep 

 transverse channels. 



This species in its general appearance very nuich resembles Jlnnl- 

 dopsis cyJtndt'ophthahiius, but close inspection shows marked differ- 

 ences in many characters. The latter species has a nuich broader 

 rostrum and smaller eyes; the carapace is much smoother, and its 

 antero-lateral angles are rounded. 



This single specimen, a female without eggt^, was taken by the 

 Alhatnm at station 3697, in 265-120 fathoms, off Honshu Island, Japan. 

 77//A^~-Cat. No. 26163, U.S.N.M. 



