Pars 15 
Andersoni. — circulare. 
187 
Andersoni Arnold var. barkerianus Arnold. 
1906 Pecten (Plagioctenium) Andersoni var. barkerianus Arnold, 
(139), p. 83, 84, T. XXVI, fig. 9. 
Untermiocan. Kalifornien. 
cerrosense Gabb. 
1869 Pecten cerrosensis Gabb, Geolog. Survey of California, Pale- 
ontology, II, p. 32, T. IX, fig. 55, 55a. 
1898 Pecten cerrosensis Dall, The tertiary Fauna of Florida etc.. 
Trans. Wagner Free Inst. Sci., III, pt. 4, p. 705. 
1898 Pecten (Plagioctenium) subventricosus Dall, (308) p. 707, 
T. XXIX, fig. 8. 
1903 Pecten (Plagioctenium) subventrosus Arnold, Mem. Cal. Acad. 
Sci., III, p. 114. 
1904 Pecten subventricosus Rivers, Bull. So. Calif. Acad. Sci., III, 
Nr. 5, p. 69. 
1904 Pecten ventricosus? Rivers, ibid., p. 69. 
1906 Pecten (Plagioctenium) cerrosensis Arnold, (139) p. 123, 124, 
T. 44, fig. 5; T. 49, fig. 1, la, lb. 
1907 Pecten (Plagioctenium) cf. cerrosensis, Arnold-Anderson, (340) 
p. 59. 
1907 Pecten (Plagioctenium) cerrosensis Eldridge- Arnold, (339) 
p. 24, T. XXXV, fig. 6. 
Pliocan. Kalifornien. 
cerrosense Gabb var. Mendenhalli Arnold. 
1906 Pecten (Plagioctenium) cerrosensis var. Mendenhalli Arnold, 
(139) p. 84, 85, T. XXV, fig. 2, 2a, 2b. 
Miocan. Kalifornien. 
circulare Sowerby. 
1835 Pecten tumidus Sowerby, Proc. Zool. Soc. London, p. 109 (non 
Turton 1822). 
1835 Pecten circularis Sowerby, ibid., p. 110. 
1843 Pecten ventricosus Sowerby, Thes. Conch., I, pt. 1, Pecten, 
p. 51, T. XII, fig. 18, 19, 26. 
1843 Pecten circularis Sowerby, ibid., p. 51, Nr. 18, T. XII, fig. 23. 
1852 Pecten ventricosus Reeve, Conch. Icon., VIII, Pecten, sp. 31, 
T. VII, fig. 31 a, b. 
1853 Pecten circularis Reeve, ibid., sp. 137, T. XXXI, fig. 137. 
1869 Pecten ventricosus Gabb, Geolog. Survey of California, Pale- 
ontology II, p. 104 (= P. var. aequisulcatus Carpenter, pars). 
1888 Pecten ventricosus Kiister et Kobelt, Conch. Cab., XVII, pt. 2, 
sp. 64, p. 100, T. XXVIII, fig. 1 — 3. 
1888 Pecten (Dentipecten) circularis Kiister et Kobelt, ibid., sp. 151, 
p. 188, T. 51, fig. 5—8. 
1898 Pecten (Plagioctenium) ventricosus Dall, (308) p. 710, 711. 
1898 Pecten compactus Dall, (308) p. 707, T. XXXIV, fig. 5. 
1903 Pecten (Plagioctenium) ventricosus Arnold, Mem. Cal. Acad. 
Sci., III, p. 114, T. XI, fig. 3, 3a, 6, 6a. 
1904 Pecten ventricosus Keep, West American shells etc., San 
Francisco, p. 41 — 42. 
1906 Pecten (Plagioctenium) circularis Arnold, (139) p. 125, 126, 
T. 42, fig. 3—6; T. 44, fig. 6, 7. 
13 * 
