26 



BULLETIN 16 4, UNITED STATES NATIONAL MUSEUM 



Armenoceras hat at, new species. 



Armenoceras harioi (Kobayashi). 



Armetioccras manchurense (Kobaya- 

 shi). 



Armenoceras nanum takayamai, new 

 variety. 



Armenoceras penhsiense, new species. 



Armenoceras richthofeni (Freeh). 



Armenoceras suzukii, new species. 



Onnoceras chinense, new species. 



Isoteloides sp. 



From the lower fossil horizon : 



Stromatocerium rcgulatum, new spe- 

 cies. 



Maclurites bigsbyi (Hall). 



Playfairia cf. deltoidea (Conrad). 



Cycloceras (?) maMo/iMrfcnsc, new spe- 

 cies. 



Cycloceras aokii, new species. 



Sactoceras kobayashii, new species. 



Sactoceras inaii, new species. 



Armenoceras elegans, new species. 



Armenoceras asiaticum,, new species. 



Armenoceras resseri, new species. 



C annarocladia forms a characteristic bed about 3 m thick in the 

 uppermost part of the Ssuyen and is directly overlain by the appar- 

 ently conformable Carboniferous variegated siliceous shales. A fine 

 StronuLtoceiium bed about 1.8 m thick occurs in the lower part of 

 the lower fossil horizon. 



2. Moderately thick-bedded, light-gray dolomitic limestone with 

 beds averaging 10 cm in thickness, 40 m (131.2 feet). 



Total Ssuyen formation, 160 m (524.8 feet). 



The dark and grayish massive beds of the Ssuyen limestone form 

 great cliffs just north of the Pen-hsi-hu colliery along the Antung- 

 Mukden line and are here quarried for manufacture of natural ce- 

 ment. (See pi. 2, fig. 2.) 



WuTiNG formation: 



Moderately thick-bedded, gray to dark limestone, interbedded 

 with thin edgewise conglomerates and arenaceous limestone beds, 

 varying in thickness from 1 to 30 m, 80 m (262.4 feet). 



Fauna. — I have collected the following species from this forma- 

 tion in the vicinity of the second tunnel, 1 mile north of Pen-hsi-hu : 



Plectoceras ohtakai, new species. 

 Nybyoceras foerstei Endo. 

 Armenoceras numatai, new species. 

 Ormoceras manchwriense, new species. 

 Bathynrusff sp. 



Orthis calligramma ortham^honites von 



Buch. 

 Raphistoma cf. aequilaterum. Koken? 

 Helicotoma. sp. 

 Eccylioptcrus sp. 

 Cycloceras (?) marginale, new species. 



The Pen-hsi-hu cave is formed in the Wuting formation in this 

 section. (See pi. 2, fig. 1.) 



The Ordovician limestone breaks down and forms a broad, ir- 

 regular rough slope from the cliff on the southwest side of the Huo- 

 lien-chai Valley. 



K!aNGYAO FORMATION : 



Moderately thick-bedded, gray limestone with many irregular 

 calcite veins. 

 Fav/na. — Fragments of gastropod shells. 



