Subjaniilies, Genera, and Subgenera — Recent and Fossil 161 



Geological Horizon and Distribution. Eocene period. Truckee Lake 

 beds, Nevada, several localities. Miocene. Contra Costa Lake beds, Cali- 

 fornia, Planorbis pablocinus J. G. Cooper, 1894, is believed by Hannibal 

 to be congeneric. 



Species Considered as Valid. Perrinilla cordillerana (Hannibal), the 

 genotype, is the only recognized species of the genus. 



Remarks. PerriniUa appears to be more closely related to Carinifex 

 than to Helisoma, as suggested by Pilsbry (1934, p. 49), who says 



Perrinilla Hannibal, 1912 .... seems to stand near the form of the Carinifex phylum 

 to be expected in the Eocene, and it maj' possibly belontj in the ancestral line of 

 Carinifex. 



The best disposition of the group in planorbid classification appears to be 

 as a distinct genus near Carinifex. 



Genus PARAPHOLYX Hanna, 1922 

 T3-pe by original designation Pompholyx efjusa Lea 



1856. Pompholyx Lea, Proc. Acad. Nat. Sci. Phil., VIII, p. 80. Type Pompholyx 



efjusa Lea. Not Pompholyx Goose, 1851, Rotifera. As genus 



1857. Pompholyx Le.\, Journ. de Conch., VI, p. 208. As genus 



1865. Pompholyx W. G. Binxey, L. and FW. Sh. N. A., 11, p. 73. Type Pompholyx 



efjusa Lea. As genus 



1866. Pompholyx Dall, Proc. Cal. Acad. Sci., Ill, pp. 265, 268. De.scription of sub- 



family Pompholiginae 

 1868. Pompholyx J. E. Gr.\y, Ann. Mag. Nat. Hist., (4) II, p. 387. As genus 

 1870. Pompholyx Dall, Ann. N. Y. Lye. Nat. Hist., IX, pp. 334, 344, 353. Type 



Pompholyx efjusa Lea. As genus. Anatomy imperfectly described 

 1870. Pompholyx Tryon, Con. Hald. Mon., pp. 83, 174. Type Pompholyx efjusa Lea. 



As genus 



1883. Pompholyx Fischer, Man. de. Conch., 507. Type Pompholyx efjusa Lea. As 



genus 



1884. Pompholyx Tryox, S. and S. Conch., Ill, p. 105. Tj'pe Pompholyx efjusa Lea. 



As genus 

 1886. Pompholyx Clessix, Conch. Cab., XVII, p. 226. Type Pompholyx efjusa Lea. 



As genus 

 1912. Pompholyx Haxxibal, Proc. Mai. Soc. London, X, p. 162. Type Pompholyx 



efjusa Lea. As genus 

 1918. Pompholyx Walker, Miscel. Pub. Mus. Zool., Univ. Mich., No. 6, pp. 14, 105. 



Type Pompholyx efjusa Lea. As genvis 

 1922. Pompholyx Germaix, Rec. Ind. Mus., XXI, p. 185. Type Pompholyx efjusa 



Lea. As genus 

 1922. Parapholyx Hanxa, Univ. Oregon Pub., I, No. 12, p. 5. New name for Pom- 

 pholyx Lea, 1856, non Goose, 1851 

 1927. Pompholycodea Lixdholm, Proc. Commission for study of Lake Baikal, II, 



p. 180. New name for Pompholyx Lea. not Goose 

 1929. Parapholyx J. Hexdersox, Univ. Col. Studies, XVII, No. 2, p. 145. Type 



Pompholyx efjusa Lea. As genus 

 1931. Pompholycodea Thiele, Handbuch, Teil 2, p. 480. Type Pompholyx efjusa Lea. 



As genus 



1934. Parapholyx Pil.sbry. Proc. Acad. Nat. Sci. Phil., 86. pp. 46, 51. Type Pompholyx 



efjusa Lea. As genus 



1935. Parapholyx J. Hexder.sox, Fossil Non-Marine Moll. N. A., p. 254. As genus 



1936. Parapholyx F. C. Baker, Nautilus, L, pp. 30-31. Notes on anatomy 



