PLATE IF. 



Ordovician Gastropoda and Cephalopoda (11-13); Lower Ordovician: Peilintze and Liang- 

 chiashan Limestones; Upper Ordovician: Machiakou Limestone. 



Drawings by K. C. Liu ($$%%&) 



Fig. 1. Ophileta pi ana Grabau p. 20 



Adult specimen, natural size, embedded in rock (which is not fully represented). 

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

 Chia-Shan, Chihli, Coll. F. F. Mathieu. (Cotype G. S. Ch. Cat. No. 84). 



Fig. 2. Ophileta plana Grabau p. 20 



Young shell, top (2a) and side (2b) views. Natural size. The surface sculpture is 

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

 ian) Liang-Chia-Sban, Chihli. Coll. F. F. Mathieu. (Cotype G. S. Ch. Cat. 



No. 83). 



Fig. 3. Ophileta squamosa Grabau p. 22 



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

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

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



Fig. 4. Ophileta squatnosa Grabau p. 22 



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

 limestone, Pei-Lin-Tze, Cliihli. Coll. F. F. Mathieu. (Cotype G. S. Ch. Cat, 

 No. 85). 



Fig. 5. Ophileta squamosa Grabau p. 22 



Natural section of an adult specimen, natural size. Peilintze limestone, Pei-Lin-Tze, 

 Chihli. Coll. F. F. Mathieu. (Cotype G. S. Ch. Cat. No. 95). 



Fig. IJ. Ophileta squamosa Grabau p. 22 



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

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



Fig. 7. Ecci/lioptcrus kushanensis Grabau p. 23 



7a Summit view of the holotype 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. 

 Machiakou limestone, Ku-Shan, Hwo-Luh-Hsien, Chihli. (Holotype G. S. Ch. 

 Cat. No. 96). 



Fig. 8. Eceytioptents sinensis (Freeh) p. 23 



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

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

 kushanensis.) Sd section of the same to show form of whorls and excessive embra- 

 cing. Middle? Ordovician. G. Langford Smith Coll. (G. S. Ch. Cat. No. 97). 



Fig. 9. Kccyli'vmpJialus tangshanensis 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. 10. Salpingostonwi tcrrilli Grabau --P- 3-> 



a top, b side, and c anterior views of the type and only known specimen which is 

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



Fig. II. Chihlioceras nathani Grabau P- ^ 



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

 on pi. IV. (For location see text fig. 6a-b, p. 46). Peilintze limestone, Shih-Mun- 

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



104 



