70 University of California Publications in Geology [ VoL - 7 



neys seems a very probable method. These open chimneys may 

 have acted as pitfalls into which animals blundered in passing 

 over the surface. Again, predatory forms may have carried 

 their prey into the mouths of the caverns whence the accumulated 

 bones were washed, or carried by woodrats, into the more remote 

 recesses. This last method seems to the present author the 

 most probable means of introduction of such forms as the 

 anserines among birds. Falco peregrinus, whose remains also 

 occur in the deposits, is a large and powerful hawk which 

 habitually resorted to such places to nest. About the entrances 

 to their nesting crevices today one commonly finds the ac- 

 cumulated bones of a great variety of vertebrates brought as 

 prey. Their predilection for the anserines has given these birds 

 their common name of duck hawk. 



Sinclair records the following list of vertebrates from the 

 Potter Creek Cave deposits, marking extinct species with an 

 asterisk : 



Sinclair's List of Species from Potter Creek Cave 



*Arctotherium simum Cope. 

 *Ursus, n. sp. 

 *Felis, n. sp. 

 Felis, near hippolestes Merriam, 

 C. H. 



Lynx faseiatus Eafinesque. 



Lynx faseiatus, n. subsp. (?) 



Urocyon townsendi Merriam, C. H. 



Vulpes caseadensis Merriam, C. H. 

 *Canis indianensis Leidy. 

 *Taxidea, n. sjv. 



Bassariscus raptor Baird. 



Mephitis occidentalis Baird. 

 *Spilogale, n. sp. 



Putorius arizonensis Mearns. 



Aretomys, sp. 



Sciurus hudsonicus albolimbatus 

 Allen. 



Seiuropterus klamathensis Mer- 

 riam, C. H. 



Spermophilus douglasi Bichard- 

 son. 



Eutamias senex (?) Allen. 



Callospermophilus chrysodeirus 



Merriam, C. H. 

 Lepus ealifornieus Gray. 

 Lepus klamathensis Merriam, C. 



H. 



Lepus, near auduboni Baird. 



Lepus, sp. 

 *Teonoma, n. sp. 



Neotoma fuscipes Baird. 



Mierotus ealifornieus Peale. 

 *Thomomys, n. sp. 



Thomomys leucodon Merriam, C. 

 H. 



Thomomys monticola Allen 

 *Aplodontia major, n. subsp. 



Seapanus ealifornieus (?) Ayres. 



Antrozous pallidus Merriam, C. H. 

 *Platygonus (?) sp. 



Odoeoileus, sp. a. 



Odoeoileus, sp. b. 



Haplocerus montanus Ord. 

 *Eueeratherium eollinum Sinclair 

 and Furlong. 



* Species marked with the asterisk (*) are either extinct or are no 

 longer represented in the region. 



