ART. 8 CRUSTACEANS FROM MEXICO RATHBUN" 9 



the spine and an appreciable narrowing of the carapace at this 

 point. Surface covered with very fine granules placed rather near 

 together. 



MeasureTTients. — Width of carapace just in front of the spine 10 

 mm., width just behind the spine 11 mm. 



Occurrence. — Tuxpan, State of Vera Cruz; highest beds, Hill C; 

 Miocene; S. Smith collector; one specimen showing portion of 

 carapace including the base of the posterior of the lateral spines 

 on each side; holotype, Gat. No. 371092, U. S. N. M. 



Family CALLIANASSIDAE 



CALLIANASSA PELLUCmA Rathbun 



Callianassa pelluoida Rathbun, Publ. 291, Carnegie Inst, of Washington, 

 1919, p. 165 ; Anguilla, West Indies ; Oligoceue. 



Occurrence. — Zacamixtle, Tuxpan, State of Vera Cruz ; November 

 19, 1920 ; Miocene : Bed at top of Azteca Incline ; Coll. No. M 35 

 V ; one right movable finger and fragments of a left movable finger, 

 free from matrix ; also several fragments embedded. Beds 25 to 35 

 feet above top of Azteca Incline ; Coll. No. M 37 V ; portion of finger 

 embedded in matrix. 



CALLIANNASSA PUSTULATA Withers 



Callianassa pustulata Withers, Geol. Mag., vol. 63, 1926, p. 106, pi. 9, figs. 

 5-9; Barbados, Upper Eocene. 



Occurrence. — Trail, Las Piedras to Palma Sola, by Ajoloco, 1610 

 m. north and 1360 m. east of Las Piedras; Eocene; December 7, 

 1920; M 123 V; 2 right palms and 1 left palm free from matrix, 

 margins incomplete, height of largest one 9 mm. ; also 3 palms par- 

 tially embedded. 



CALLIANASSA TEPETATENSIS, new species 



Plate 6, Figures 3 and 4 



Description. — A fragment of the palm of a right chela of large 

 size. Outer surface very convex, inner surface relatively flat, but 

 with a depression near the middle of the upper portion and another 

 on the distal half of the lower surface. The margin articulating 

 with the carpus appears to reach nearer the lower margin than the 

 upper; it forms an obtuse angle with the upper margin. On the 

 outer surface a little behind the fixed finger there is a cluster of 

 large granules of which only 7 remain. From the position of the 

 interdigital sinus, it appears that the dactyl must have been nar- 

 rower at base than the fixed finger. The lower proximal half of the 

 inner surface of the palm is covered with large flat granules near 

 but not close together. The incomplete upper margin is rough with 



