pL.vj^i'] ir. 



U'nluviciaii Uaxiroiimhi and Ccplialnjiodn (11-lJ); Loirer Ordovician: Pciliiih.e and Liang- 

 chiasltaii Livic^^loncK: Ijipcr Ordovician: MucliiaLon Li nirstoiic. 



J)ivifinijs hij K. (J. Li a {$l}^M) 



Fig. 1. OpIiUclii jilanii Cirabau p. 21) 



Adult sjieciijit'ii. iiiiturul .size, emlicddrd in i'(.)Ldc (which is not fully repreaejited) . 

 The surface is weathered. LiangchiaKhaii limestone (Lower Ordovician) Liang- 

 Uh.ia-yiian, (.'hihli, Cull. V. V Ahdhien. (C'otype G. .^. Oh. Cat. No. 84). 



Fig. '1. Opliihta plana Crahan p. 20 



Young shell, top (2a) and side (2lj) \irw^. Natural size. The surface sculpture is 

 only apparent, and due to weatheiing. Liangchiashan limestone (Lower Ordovic- 

 ian) Liang-Chia-Shan, Chihli. Coll. F. F'lMathieu. (Cotype G. S. Ch. Cat. 

 No. S3). 



Fig. 3. Opliihja sqnainuna (Jraban.... p. 22 



3a Top view of a small specimen witli lax final whorl, enlarged twice. 3b side view 

 of the same, X 2, Leilinlze Umestonc, Pei-Lin-Tze, Shih-Mun-Chai, Chihli. Coll. 

 F. F. Mathieu. (Cotype G. S. Ch. Cat, No. 86). 



Fig. i. <Jpliilcta sqaainom Grabau p. 22 



Umbilical view of a fragment of the whorls of a young specimen X 2. Peilintze 

 limestone, Pei-Lin-Tze, Chihli. Coll. F. F. ^Ldhieu. (Cotype G. S. Ch. Cat. 

 No. 85). 



Fig. ■"). Opliilcla K<pia;muS(i' Girabau p. 22 



Natural section of an adult s])ecimen, natural size. Peilintze limesl(jne. Pci-Lin-Tze, 

 Chihli. Coll. F. F. JMathieu. (Cotype (;. 8. Ch. Cat, No. \)5) . 



Fig. <i. Ophileta sqaainomi (irabau p. 22 



A much weathered section of an adult specimen. Natural size. Peilintze limestone, 

 Pei-Lin-Tze, Chihli, Coll. F. F. .Malhieu. (Cotype G. S. Ch. Cat. No. 89). 



Fig. 7. Ecci/Iiojilinr.-^ Inslianciisig <irabau p. 23 



7a .Summit view- of the holotyjie natural size. 7b Umbilical view of the same, natural 

 size. 7c Cross-section of the shell to show form of whorls and degree of embracing. 

 ALichiakou limestone, Ku-Shan, Hwo-Luh-Hsien, ChihU. (Holotype G. S. Ch. 

 Cat, No. 96). 



Fig. 8. Ei:r}jliijpl('iiiK sinensis (Freeh). , p. 23 



8a-c. Summit, lateral and umbilical views of a characteristic specimen from 

 Nei-Ya-Shan, near Ichang, IFupeh, South China, (For comparison with E. 

 Jnisliancnsix.) 8d section of the same to show form of whorls and excessive embra- 

 cing. iMiddleY Ordovician. G. Langford Smith Coll. ((J. S. Ch. Cat. No. 97). 



Fig. 9. l-Jcci/liinniiliolns langyJianen^iis Grabau p. 24 



Worn under surface of the partly exposed holotype. Natural size. Machiakou 

 limestone, Tang-Shan, Chihli. (Holotype G. S. Ch. Cat. No. 6). 



Fig. lU. Salpiii.go-'iti.niia, Icrrilli (Jrabau p. 3,"i 



atop, b side, and c anterior views of the type and only known specim.en which is 

 crushed and partly broken. Natural size. (Holotype. G. S. Ch. Cat. No. 32). 



Fig. IF Cliililiocera.'f nulliani Grabau p. 48 



An oblique section through the upper jiart of the endocone of the specimen fig. 13 

 on pi. IV. (For location see text lig. (la-b, ]i. 46). Peilintze limestone, Shih-Mun- 

 Chai region, Chihli. F. F. Mathieu Coll. (Cotype G. S. Ch. Cat. No. 110). 



~ 104 — 



