I'LATK liT 



Page 



FiGLKE.s 1,2. Rdithixioiiia cf. (ic<jitil(iti'rinii KokfiiV 51 



rinhllical and top vii'ws. 



Lower Ordoviciaii. Wutiiiy foniiatioii : Gray sandy lime- 

 stone, 4 miles east of Pen-hsi-liii. Liao-tnnir. Manclmria. 

 8,4. AiitlKinpidcUa discoidaJis, new speeies 37 



3, Rock frafrment composed almost entirely of the siionge. 



4, A polished surface of another part of the same speci- 

 men. 



Lower Ordovician. Kangyao formation : In the black lime- 

 stone south of Yen-tai. Liao-tuny;, Manchuria. 



5. Cyclocerasi'!) tn a rg in ale, new si^ecies 71 



A polished vertical section in a dorsoventi'al direction 

 across the conch, showin.i;' the structure of siplmncle. 

 (See also pi. 40, fig. 11.) 

 Lower Ordovician, Wuting formation : In the lilack liine- 

 .stone near Pen-hsi-hu, Liao-tung, Manchuria. 



G. Oniioceras manchurieuse, new species 103 



Vertical dor.soventral section of the type .specimen, show- 

 ing location and structure of siphiuicle. (See also 

 pi. 40, fig. 16.) 

 Formation and locality same as Figure 5. 



7-lf>. Ortliix caljiyiinnimi ortliamhonitcs von Buch 43 



7, 8, Exterior of two pedicle valves. 

 9, 10, Exterior of two brachial valves. 

 Formation and locality same as Figures 3 and 4. 

 134 



