o 



PLATE VI. 



Ujijiri- Oi'ilovicia II ( 'rjijialnjinda: — Hfncliial'iia Lifiicxtonf. 



Drawings by K. C. Lin (fljjfc^) 



Fig. 1. Ci/cloceras? pcifnufr.cnsc Grabau p. 03 



Fragment of the small end of a shell with rounded annulations. Natural size. 

 Machiakou limestone, Pei-Tou-Tze (near Chao-Kou-Chuang) , Chihli. (Cotype, G. 

 S. Ch. Gat. Xo. 28). 



Fig. 2. C iidoceras'! peitcmtzense Grabau p. G3 



Living chamber (without septa) of an immature individual, with sharp annulations. 

 Natural size. ^Machiakou limestone, Pei-Tou-Tze (Kaiping basin), Chihli. (Co- 

 type, G. S. Ch. Cut. No. 20). 



Fig. 3. Cycloceras? pcifoufr.ciise Grabau p. 6 



The largest specimen obtained, partly embedded in rock. In the upper part is 

 shown a poition of what was probably the living chamber. The surface here shows 

 very fine concentive stri» (see fig. 4). The lower part, which appears to be part of 

 the same specimen does not preserve the stiiir. The ]>osition of the two fragments, 

 and the form of the smaller one suggest that the shell was curved. Natural size. 

 ]Mackiakou limestone, Chao-Kou-Chuang, Cliihli. (Cotvpe, (I. S. Ch. Cat. 

 No. 107). 



Fig. 4. < 'i/chirrnif:':' jieituHt-j'ii.sr Grabau p. G3 



Enlargement of part of surface of figure. 3, (X •'!.) to show the fine concentric 



striic. 



Fig. ■'. S/rrri)pJasinoceiris pscuilosiptnliirn Grabau p. 60 



5a. Li;ingitailinal section of a large specimen, not showing siphuncle, but showing 



pseudosepta and stereoplasmic filling. Natural size, 

 ■""lb. Cross section of the same. Natural size. ?*lachiakou limestone, Tangshan, Chihli. 

 ' (Colype, G. S. Ch. Cat. No. .'S) . 



Fig. ti. Stercipjlosmofiriis psciKhjKcpUiin in (xrabau p. GG 



• la. Longitudinal section, showing depth of septa, pseudosepta, and filling of stere- 



o[)lasm. Natural size. 

 Gb. rrofs-se<;tion of san]e. Natural size. Machiakou limestone, Ning-Yang, Sliantung. 

 (Cotype, (i, S. Ch, Cat. No. ."7). 



Fig. 7 Stcrcoplasmoceras pscndoscpiddnn (_u'abau p. G6 



A natural section, weathered, showing the septa, pseudosepta and excentric 

 siphuncle. The strongly nummuloidal character is shown in the lower jiart and the 

 non-Actinoceran type of filling in the upper. Natural size. Machiakou limestone, 

 Chao-Kou-Chuang, Chilili. (Cotyjie, Survev Expedition Coll., (_!. S. Ch. Cat. 

 No. 78). " . 



Fig. 8. SlcrropJnshiiirri-as mncli iiiL-oiniciisr Grabau ■. p. 68 



A natural section in the rock, showing narrowly nummuloidal siphuncle, pseudo- 

 septa and filling of stei-eopla'^iii. Natural size. Machiakou limestone, ^hi-Gliia-Kou. 

 Clnhli. (Hoi. '.type, IL G. T'an Gull., (!. S. Ch. Cat, No. l.",). 



— ILs - 



