166 GEOLOGY AND PALEONTOLQGY OF THE WEST INDIES. 



lowed out in a broad, shallow sinus. The general shape is subcylindrical, dis- 

 tally tapering, but the lower edge of the outer surface is acute. There are a 

 few scattered granules or small tubercles, but it is impossible to tell how much 

 these affected the outer shell : on the outer surface above the lower edge there 

 is a row of 4 distant granules; 4 near the proximal end of the upper surface, 

 and 1 near the distal end; 1 on the inner surface behind the middle. 

 Length, 20.4 mm.; greatest width, 5.3 mm.; thickness, 4.1 mm. 



The two palms (paratypes) are too incomplete to show their propor- 

 tions. The lower edge is thin, translucent (to which the specific name 

 alludes), in the larger specimen (paratype a) slightly sinuous, that is, 

 rounded up at the proximal end and bending down toward the fingers ; 

 below the true edge of the palm project the bases of sockets ranged in 

 a row on the inner surface; there are about 17 of these sockets in the 

 larger specimen. The cross-section at the base of the finger has the 

 shape of a diamond very elongate below the angles (plate 1, fig 10). 



Callianassa miocenica, new species. 

 (Plate 2, Figures 1 to 6.) 



Type locality. Lower half of the valley of the Yaqui del Norte 

 River, in the northern part of Santo Domingo, Haiti; probably lower 

 Miocene; W. M. Gabb, collector. 



Holotype. Left manus of large cheliped. Cat. No. 2264, Mus. 

 Phila. Acad. Nat. Sci. 



Measurements. Length of manus measured from sinus between 

 fingers, 21.2; width of manus near proximal end, 17.4; width of manus 

 near distal end, 15.2; greatest thickness of manus, 7 mm. 



The following is a description of the left manus of this species : 



The upper margin is straight and at right angles to the proximal end, while 

 the lower margin is slightly convex and oblique, being inclined upward toward 

 the distal end and inward toward the proximal end. Outer surface very convex 

 from top to bottom, but from end to end flat in the middle and bent inward at 

 the ends. On the outer surface are 3 large pits far apart in a line below the 

 middle; the pits increase in size distally, the largest one being near the articu- 

 lation of the dactylus; one pit higher up and midway of the length of the seg- 

 ment. Upper margin subacute in its proximal two-thirds; lower margin 

 broken away. Inner surface uneven, concave in the lower distal portion; 

 surface covered with small pits, visible without a lens, scanty near the distal 

 end. Here there is a transverse curved line (concave forward) of 8 granules, 

 just below the middle; the margin overlapping the dactylus is bordered with 

 15 tuberculiform teeth, the lowermost of which is the largest and much swollen 

 and lies below the dactylus. Ten similar small teeth are visible on the distal 

 end of the outer surface. Near the upper edge are 2 rows of large pits; one 

 row consists of 5 pits and is wholly on the inner surface, bending downward 

 distally; the other row shows 3 pits in a straight line which is slightly oblique. 



Relationships. From C. anguillensis this species differs in the 

 smooth (non-granulate) surface of the manus; from C. pellucida in the 

 straighter (viewed from below only) lower edge of the manus. 



