TERTIARY DECAPOD CRUSTACEANS. 165 



The following is a description of the paratypes: 



Paratype a, right manus, No. 6966. This is free from the matrix and is 

 much worn and incomplete at the ends, width at posterior third, 17.4 mm. It 

 agrees with the holotype as far as the characters are preserved. The shape is 

 similar, also the thin lower edge with a row of sockets just inside, the granula- 

 tion of the lower part of the outer surface, and the single tubercle just below 

 and within the upper margin, and, in this instance, 5 mm. behind the distal end. 



Paratype b, finger, No. 6966. Lacks the tip and proximal end and is 

 embedded in rock with its concave surface uppermost. Chalky white. Cross- 

 section triangulate. 



Paratypes c and d, right and left manus, No. 6894. These specimens are 

 too bruised to refer definitely to any species. They have the general shape of 

 the holotype of C. anguillensis. The left manus has the thin lower and the 

 thick rounded upper margin, the latter with the submarginal tubercle distal 

 to the middle, but not so near the forward end as in the holotype; it lacks 

 details of granulation, sockets, etc. The right manus is even less adequately 

 preserved. 



Paratype e, finger, No. 6894. The distal portion of a finger embedded in 

 rock, with convex surface partly exposed, should probably be referred here. 



Callianassa latidigita, new species. 

 (Plate 9, Figures 10 and 11.) 



Type locality. The Yaqui Valley at Cercado de Mao (Bluff 3), 

 Santo Domingo; lower Miocene; C. J. Maury, collector; 1916. 



Material. A movable and an immovable finger of the left chela; 

 the latter is the holotype. Cat. No. 324470, U. S. N. M. 



This species has granulation on the palm at the base of the immov- 

 able finger similar to that in C. anguillensis (compare plate 1, fig. 1, 

 with plate 9, fig. 11) ; the finger itself is, however, broader at base and 

 is subtriangular, while the finger of anguillensis tapers very gradually 

 at base. The inferior, marginal rim is continued further toward the 

 tip in the Cercado specimen, while the upper edge is furnished near 

 the base with two shallow lobes which are lacking in anguillensis. 

 The dactylus has the same general shape in the two forms, but both 

 specimens are too incomplete for close comparison. 



Callianassa pellucida, new species. 

 (Plate 1, Figures 8 to 13.) 



Type locality. Anguilla: Crocus Bay, from bluff on southwestern 

 side; uppermost horizon, 125 feet above sea-level; Anguilla formation; 

 Oligocene series; T. W. Vaughan, collector; March 4, 1914; 6967; L. I. 

 100 c (1914). One left movable finger (holotype) ; a portion of each of 

 two right palms of very different sizes (paratypes). 



Holotype and paratypes. Cat. No. 166944, U. S. N. M. 



The following is a description of the holotype: 



The shape of the entire finger is shown, but the outer layer is almost all 

 lacking. Upper margin arched, tip acute and strongly bent down; lower 

 margin straight except near the tip and at the proximal end, where it is hoi- 



