NO. 2 MUD SHRIMPS — SCHMITT I7 



carpus, for, although the dorsal serrations are scarcely visible from 

 the side, the ventral ones are plainly so ; the latter run forward only 

 about half the length of the ventral border of the fixed finger. The 

 prehensile edge of the dactylus has two elongate, not very prominent, 

 laminate teeth, the fixed finger a single low triangular, more or less 

 inconspicuous one a little behind the middle of its length. In the 

 smaller chela the ischium is very little longer than the merus, subequal 

 to the carpus, and nearly a third longer than the upper border of the 

 palm ; the movable finger is a little longer than the palm above. The 

 greatest width of the carpus is contained about twice in its length, and 

 equal in width to the palm ; the width of the latter is contained in its 

 upper border about one and one-third times. 



On the inner surface of the ischium of the third maxilliped (pi. 3, 

 fig. i) there is a curved row of 17 teeth, of which the proximal 7 are 

 strong, acute spines, and the remainder on the distal moiety of the 

 comb are dentiform rather than spiniform. 



Telson truncate, hinder margin slightly scalloped, a little less than 

 one-half the length of the sixth somite and about four-fifths as long 

 as its greatest width ; inner uropod longer than the telson, but shorter 

 than the outer uropod, broadly triangular ; outer blades but weakly 

 sculptured. Somites of the abdomen remarkably smooth and without 

 ornamentation. 



Type. — U.S.N.M. no. 23010, the larger of two male specimens in 

 the collections of the National Museum, both from Bluefields, Jamaica, 

 where they had been washed up after a storm in the summer of 1899. 

 It measures (in millimeters) : carapace and rostrum 18 long, abdomen 

 and telson together 43, telson 5.3 by 6.7 wide ; large cheliped, ischium 

 10 long, merus 11, carpus 6.5 long, greatest width 10.5, palm, upper 

 border 12 long, movable finger 12, lower border 22.2, width of palm 

 at middle of length 11. Small chela has the ischium 8.3 long, merus 

 y.y, carpus 9 by 4 wide, palm, upper border 6, movable finger 6.8, 

 lower border, including fixed finger, 12.0, width of palm at middle of 

 length 4.3 



CALLIANASSA (CALLICHIRUS) LONGIVENTRIS A. M.-Edw. 



Callianassa Inngivcntris A. Milne-Edwards, Nouv. Arch. Mus. Mem., vol. 6, p. 92, 



1870. 

 Callianassa (Callichirus) longivcntris de JNTan, Capita Zoologica, vol. 2, pt. 6, 



p. 24, figs. 12, 12 h, 1928. 



From the bathing beach at Montego Bay, Jamaica, Dr. E. A. 

 Andrews, of Johns Hopkins University, took two specimens of a 



