Pars 14 
Pericyclus. — Thalassoceras. 
17 
P. (?) Jacksoni E t h e r i rl g e, Palaeont. Contribution to the geol. 
of Western Australia, 1907, p. 36, Pl. IX. fig. 1 — 3. (Gastrio- 
ceras). 
West Australia. Palaeodyas. 
P. Pseudo-Meneghinii H a n i e 1, Cephal. Dyas v. Timor, 1915, p. 
64, Taf. XLIX (IV). fig. 4—6. 
Timor (Bitauni). Palaeodyas. 
P. sundaicum H a n i e 1, Cephal. Dyas v. Timor, 1915, p. 58, fonn. 
involuta, Taf. XLVIII (III). fig. 3, 5, 7. LIII (VIll), fig. 8, 
Textfig. 15, form. evoluta, Taf. XLVIII (III). fig. 4, 6, Text- 
fig. 16—18. 
Timor (Atsabe, Bitauni). Palaeodyas. 
P. Tschernyschewi Karpinsky, Ammoeen d. Artinsk-Stufe. 
1889, p. 62, Taf. ID. fig. 1. 
Ural, Artinsk-Stufe. Unt. Palaeodyas. 
Qen. Pericyclas v. Mojsisovics. 
Cephal. d. Mediterr. Triasprov. Abhandl. Geol. Reichsanst. X. 1882, 
p. 141. — H a u g, Ammonites du Permien etc. 1894, p. 397. 
sonst Carbon. 
Typ. Goniatites princeps de Koninck (1880). 
P. sp. ind. D i e n e r, Permian Foss. Central Himalavas, 1903, p. 
123, Pl. V. fig. 21. 
Himalaya, Byans, Kuling shales. Neodyas? 
Fam. Thalassoceratidae Haug. 
Gen. Prothalas§ocera8 Boese. 
Permocarb. Ammon. Glass Mts. 1917, p. 102. 
Typ. P. Welleri Boese (1917). 
P. Welleri Boese. 1. c. p. 104, Pl. V. fig. 14 — 18. 
Texas (Hess form.) Unt. Palaeodyas. 
Qen. Thalassoceras Qemmellaro, 
Sosio, fasc. I. 1887, p. 69. 
Typ. Th. Phillipsi Gemmellaro (1887). 
Th. (an Prothalassoceras?) Gemmellaroi Karpinsky, Ammoneen 
d. Artinsk-Stufe, 1889, p. 80, Taf. IV. fig. 3. — Zur Ammo- 
neenfauna d. Artinsk-Stufe, 1890, p. 77, Textfig. 14. 
Ural, Artinsk-Stufe. Unt. Palaeodyas. 
Th. microdiscus Gemmellaro, Sosio, Fasc. I. 1887, p. 73, Tav. 
X. fig. 7—12. 
Sizilien, Sosiokalk. Ob. Palaeodyas. 
Th. Phillipsi Gemmellaro, Sosio, fasc. I. 1887, p. 71, Tav. X. 
fig. 12 — 14. — F r e c h. Dyas, 1901, Taf. 59b, fig 8. 
Sizilien, Sosiokalk. Ob. Palaeodyas. 
Th. subreticulatum Gemmellaro, Sosio, fasc. I. 1887, p. 72, 
Tav. X. fig. 1 — 6. 
Sizilien, Sosiokalk. Ob. Palaeodyas. 
Th. varicosum Gemmellaro, Sosio, fasc. I. 1887, p. 74, Tav. V. 
fig. 20—22, VII. fig. 33, 34. — F r e c h. Dyas, 1901, Taf. 
59b, fig. 9. 
Sizilien, Sosiokalk. Ob. Palaeodyas. 
2 
Fossilium Catalog. I 14 
