174 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Material. Two immovable fingers, both of the right side. The 

 larger is holotype. Cat. No. 324478, U. S. N. M. 



Description. Finger slender, except at the base; grooves 5, 2 outside, 2 

 inside, 1 below; all are deep except the upper one on the outside; intervening 

 ridges blunt, with a narrow longitudinal strip of squamiform granules along 

 the middle. Prehensile teeth uneven, the large teeth as a rule alternating with 

 2 or 3 small ones. 



Relationship. This finger resembles that of P. spinicarpus, 1 except in 

 shape, as in the latter it widens regularly from the tip to the palmar 



end. 



Portunus, indeterminable species. 



Material. Two fingers incomplete, one a right major dactylus, the 

 other larger and probably also a dactylus; if so, from the left side. 

 From the Yaqui Valley at Cercado d'e Mao (Bluff 3), Santo Domingo; 

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



Description. The right finger has 3 deep grooves, 2 outside, not far apart, 

 and 1 inside; in addition there is a very shallow groove just above the teeth, 

 both inside and out. 



The left finger has the same number of grooves, the middle one of the outer 

 surf ace fading out distally, and the grooves near the teeth almost imperceptible. 



In both fingers there is a line of punctse but no furrow on the upper margin. 



Genus CALLINECTES Stimpson, 1860. 



Callinectes declivis Rathbun. 

 (Plate 9, Figures 1 and 2.) 



Callinectes dediris Rathbun, Bull. U. S. Nat. Mus. No. 103, p. 162, plate 66, figs. 1-3, 1918. 

 (Type locality, Miocene of Banana River, Costa Rica; type, Cat. No. 324262, 

 U. S. N. M.) 



Material. Seven fingers, mostly with the proximal end broken off, 

 as follows: 2 right dactyls, 2 left dactyls, 2 right immovable fingers, 

 1 left immovable finger. From the Yaqui Valley at Cercado de Mao 

 (Bluff 3), Santo Domingo; lower Miocene; C. J. Maury, collector; 1916. 



The following is a description of these specimens : 



The dactyli have a deep groove above the middle both outside and inside 

 and a shallower groove on both sides a little way from the teeth; above there 

 is an impressed line of numerous punctse. 



The holotype, which is the sole type, lacks a dactylus and its pro- 

 podal finger is much larger than any of the Yaqui specimens, but 

 allowing for size, the specimens from the two places agree. 



Callinectes, indeterminable species. 



Material. A piece of a left dactylus or movable finger, with both 

 ends, broken off. From the Yaqui Valley at Cercado de Mao (Bluff 3), 

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



1 Achelous spinicarpus Stimpson, Bull. Mus. Comp. Zool., vol.. 2, p. 148, 1871. 



