124 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



Signal Hill (or Los Cerritos), northeast of Long Beach; upper 

 San Pedro formation; one right movable and one right immovable 

 finger. 



Spanish Bight, San Diego Bay; upper San Pedro formation, 

 Pleistocene series: two movable fingers, one right, one left, three 

 immovable fingers, one right, two left; one of the latter is taken as 

 holotype. Cat. No. 353333, U.S.N.M. Twelve other smaller immov- 

 able fingers, four right, eight left, were collected at the same place 

 by Mrs. Stephens. 



Relation. — This species is related to the Recent C. calif omiensis 

 Dana, but the Pleistocene species has wider fingers, the propodal 

 linger has flatter inner and outer surfaces. The ornamentation of 

 teeth, tubercles and hair-sockets is similar in the two species. 



Genus UPOGEBIA Leach 



Upogebia Leach, Edin. Eucyc, voL 7, 1814, p. 400; type, U. stellata 

 ( Montagu ) . 



First pair of legs subequal and subchelate; remaining pairs 

 simple. Eyestalks cylindrical; cornea terminal. Rostrum short, 

 stout, tridentate. 



Eocene; Recent. The fossil forms hitherto referred to Upogebia 

 have since been placed in other genera." 



UPOGEBIA (UPOGEBIA) EOCENICA, new species 



Plate 29, figs. 1 and 2 ; plate 30 



Description. — Five specimens show the carapace. Lateral margin 

 spinous. Front quinquedentate (pi. 29, fig. 1), the rather broad 

 median tooth flanked by a very slnall, acute tooth and separated by 

 a shallow sinus from a somewhat larger tooth which is a little less 

 advanced. These two small teeth, the intermediate and the outer 

 tooth, are situated on either side of a broad smooth gutter which 

 runs along within the lateral margin of the rostrum and is con- 

 tinued on the gastric region. The scabrous surface of the rostrum 

 is continued backward nearly to the cervical suture; the tubercles 

 or sockets are conical, pointed above and widen out anteriorly form- 

 ing a surface covered with minute punctulos which formerly served 

 as sockets for hairs. The tubercles form a single row on the lateral 

 marginal ridge and several very irregular rows on the remaining 

 area, on the rostrum two rows, and further back about three rows, 

 each side of the median line. One specimen (holotype) shows the 



'"- Van Straelen, Mein. Acad. Roy. Belgique, CI. Sci., ser. 2, vol. 7, 1925, p. 309. 



