416 University of California Publications in Geology [Vol. 13 



Univ. 

 Calif. 

 Loc. 



2157 Santiago Canon, Corona sheet. Chico float from stream bed just above 



Williams Canon. 



2158 One and seven-eighths miles N 4° W of B. M. 1271, Corona sheet. On 



crest of ridge on north side of a small eafion about 600 feet from 

 Pleasant 's house. Elevation 1650 feet. 

 2162 Four and one-eighth miles N 11° W from B. M. 1271, Corona sheet. Boad- 

 side on the west side of Baker Creek where the road crosses the creek 

 west of the house at the end of the road. Elevation 1100 feet. 



2166 Three and three-quarter miles S 70° E of B. M. 610, Corona sheet. One 



thousand feet from the road in the first canon north of the bee-house 

 in Black Star Canon. Elevation 1100 feet. 



2167 Two miles N 10° W of B. M. 1271, Corona sheet. At a gate about one- 



half mile below Modjeska Springs in Williams Cafion. 



2168 Three-fourths mile S 52° E of B. M. 1271, Corona sheet. On the top of 



a hill about one-half mile north of the road at the Santiago-Aliso 

 divide. Elevation 1400 feet. 



2169 One-half mile S 50° E of B. M. 1271, Corona sheet. On crest of Santiago- 



Aliso divide, about one-fourth mile north of the road. 

 2171 Four miles SW of Corona, Corona sheet. At clay mine, 200 feet up the 

 canon from a cabin. 



2177 Three and one-half miles N 53° E of B. M. 610, Corona sheet. On left 



side of Sierra Canon at junction with a small canon. 

 2179 One mile N 20° W of B. M. 1271. Froat from creek bed. 

 2209 Sucia Islands, San Juan County, Washington. 



DESCRIPTION OF SPECIES 

 Class PELECYPODA 

 Family Parallelodontidae 

 Genus CUCULLAEA Lamarck 

 CUCULLAEA PONDEBOSA Whiteaves 



Cucullaea ponderosa Whiteaves, Geol. Surv., Canada, Mesozoic fossils, 



vol. 1, p. 393, 1876-1903. 

 Cucullaea truncata Gabb, Palaeontology of California, vol. 1, p. 196, pi. 25, 



fig. 82, 1864. 



This species is represented in the Santa Ana fauna by a single 

 fragmentary specimen. This specimen is less ventricose, has broader 

 umbones, and is relatively thicker-shelled than the typical C. truncata, 

 resembling more closely the large form figured by Gabb and called 

 C. ponderosa by Whiteaves. 



