142 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



margin of the lobe of the maims which overlapped the dactylus is 

 very oblique and is straight and deeply crenulated with about 16 

 crenules; the length of the lobe is as great as the distance across the 

 adjoining sinus and the propodal finger. This sinus is very deep 

 and proximally subtruncate. The immovable finger is very narrow in 

 relation to the size of the palm ; it is slightly compressed, and bends 

 upward ; on the inner surface just within the lower margin there is 

 a row of punctae : on the outer face there are 3 larger spots, 2 near 

 Mie lower margin and one near the sinus, which may be sockets for 

 setae. A tubercle on the outer surface just behind the sinus. The 

 inner surface of the manus is deeply channeled out near the sinus 

 between the fingers. 



The holotype is in two pieces, as the immovable finger is broken in 

 two, the distal portion embedded in that half of the nodule which 

 bears the imprint of the remainder of the holotype. 



This species is very near C. scotti, but has a larger sinus between 

 the fingers, a longer propodal finger, and a shallower sinus in the 

 lower margin of the manus just behind the finger. 



CALLIANASSA MOINENSIS, new species. 



Plate 60, figs. 1-3. 



Type-locality. — Moin Hill, near Limon, Costa Rica. Probably 

 equivalent to Gatun formation. Miocene series. H. Pittier, collector. 

 Propodus of right cheliped, and an impression of half a finger. 



Measurements. — Length (approx.) of manus, to sinus between 

 fingers, 9 mm. ; height of same, 7 mm. ; thickness of same, 4.7 mm. ; 

 length of immovable finger (tip broken off), 8.6 mm. 



Hole-type— Cat. No. 324287, U.S.N.M. Palm much swollen, cross 

 section ovate, lower margin viewed from the side very arcuate, upper 

 margin slightly so. The surface has almost entirely lost the outer 

 white layer, but the next layer is graj^ and is crossed transversely by 

 many very short rugae, which are strongest on the lowest part of the 

 outer surface. There is a distinct line below dividing the inner from 

 the outer surface and marked by an irregular row of very fine 

 punctae. On the inner surface considerably below the upper margin 

 there is a row of large punctae. 



The immovable finger is slender, bent downward and curved 

 inward. It has 7 more or less defined ridges, the bluntest of which 

 is the most inferior; either side of the ridge representing the pre- 

 hensile edge there is a granular ridge, the outer of which is less 

 elevated ; in addition, there are 2 ridges on the outer surface and one 

 on the inner; near each ridge there is a row of fine punctae. Pre- 

 hensile edge armed with small irregular teeth. There is an unusually 

 deep furrow above the principal ridge on the inner surface. 



