10 PROCEEDIISrGS OF THE ISTATIONAL, MUSEUM vol. 78 



13 granules (or small hair-sockets), and just below on the inner 

 surface a row of 5 large distant sockets. 



Measure?7ients.—Ai)])roxim.^.te height 22, length from the inter- 

 digital sinus to the proximal margin measured in a line subparallel 

 to the upper margin 22.3 mm. 



Occurrence. — Lower California: In Arroj^o Hondo, 1 km. above 

 junction with Arroyo Conejo; upper sandstone of Tepetate forma- 

 tion, upper Eocene; December 2, 1920; Coll. No. 9695; Cat. No. 

 371093, U. S. N. M. 



EXPLANATION OF PLATES 



Plate 1 

 Lo'bonotus mexictmus, holotype, X l^^ 



Fig. 1. Front view. 



2. Dorsal view. 



3. Ventral view. 



Plate 2 



Montesumella tubulata, holotype, X iy2 



Fig. 1. Right profile, showing position of antero-lateral teeth. 

 2. Dorsal view. 



3. Ventral view. 



Fig. 1. Lower view. 



2. Inner view. 



3. Outer view. 



4. Top view. 



Plate 3 

 Scylla costata, right chela, X 2 



Plate 4 



Fig. 1. Raninoides mexicanus, holotype, dorsal view of 2 fragments of cara- 

 pace, X 3. 



2. Podophthalmus (?), species, dorsal view, X 2. 



3. Calappa ziircheH, right profile, X l^/^. 



Plate 5 



Fig. 1. Calappilia hondoensis, holotype, right profile, X 2. 



2. Same specimen, dorsal view, X 2. 



3. Calappa surcherl, dorsal view, X li/^. 



Plate 6 



Fig. 1. Xanthosia americwna, holotype, dorsal view, X 8. 



2. Ranina (?), species, carpus of cheliped, X 3. 



3. Gallianassa tepetatensis, holotype, outer view, X 2. The top line is 



at upper right of figure. 



4. Same specimen, inner view. The top line is at lower right of figure. 



o 



