PLATE I. 



Lower Ordorician Anthozoa, (1-3) and Cephalopoda (10); Pcilintze Limestone. l']>i><i' 

 Ordovlcian Braehiopoda Pelccypoda and Trilobita; Machiakou Limestone. 



Drawings by K. C. Liu (:|[}|6Jt) Photographs by T. I. Loo IJj|Mi?) 



Fig. 1. AKhxocyathus chihliense. Grabau p. 12 



la. Mold of part of interior of caliculum with weathered section near the upper edge 



of the caliculum. Natural size. 

 Ib. Photograph of partial section of caliculum 50 mm. below preceding; nearly natural 



size. The right and left sides are reversed with reference to fig. la. Lower 



Ordovician Peilintze limestone, Shih-Mun-Chai, Chihli. (Coll. F. F. Mathieu, 



Cotype G. S. Ch. Cat. No. 75). 



Fig. 2. Archie.oci/athiis chihliense Grabau p. 12 



Photograph of polished section of a compressed caliculum same horizon and locality. 

 Natural size. (Cotype Coll. F. F. Mathieu, G. S. Ch. Cat. No. 76). 



Fig. 3. Arehirocyathus ehihliense Grabau p. 12 



3a. Photograph of thin section of a nearly circular caliculum. Natural size. 

 3b. A small portion photographically enlarged X 10; same horizon and locality. 

 (Cotype Coll. F. F. Mathieu, G. S. Ch. Cat. No. 98). 



Fig. 4. Orthi* eaUigramma var. orthambonitca von Buch (de Verneuil) p. !"> 



4a brachial-,4h pedicle-, 4c side-view of a small fragmentary specimen X 3; Machia- 

 kou limestone, Chao-Kou-Chuang, Chihli province. (G. S. Ch. Cat. No. 94) . 



Fig. 5. Otihis eaUigramma var. orthambonites von Buch (de Verneuil) p. 1"> 



5a pedicle-, 5b brachial-,oc lateral-, 5d frontal-views of a larger, somewhat distorted 

 and more nearly complete specimen. X 2. (In 4d the upper valve is the brac-hial, 

 which appears as the deeper of the two because of the position in which the 

 specimen is drawn). Same horizon and locality. (G. S. Ch. Cat. No. 93). 



Fig. 6. Strophomcna cf. inntrrata (Shepard) p. 17 



Part of pedicle valve, with outline restored X 3. 



Upper Ordovician, Machiakou limestone, Chao-Kou-Chuang. (G. S. Ch. Cat. 



No. 109) . 



Fig. 7. Ctenodonta symmetrica Grabau p. I- 1 



Interior view of a right valve, showing the hinge linf, (with the teeth somewhat 

 too clearly represented), the muscular scars and anterior muscular ridge The 

 ventral margin is imperfect. Enlarged twice. Machiakou limestone, Tangshan, 

 Chihli. (Holotype G. B. Barbour Coll. G. S. Ch. Cat. No. 51) . 



Fig. 8. Asaphns bcrhmi Lorenz p. 93 



An imperfect pygidium, enlarged X 2. showing broad ringed axis, and concave 

 marginal rim. Machiakou limestone, Chao-Kou-Chuang, Chihli. (G. S. Ch. Cat. 

 No. 92) . 



Fig. 9. Asplm* btrhnti Lorenz p. '" 



Another pygidium from the same horizon and locality as the preceding but 

 exfoliated, showing narrow axis, X 2. (G. S. Ch. Cat. No. 110). 



Fig. 10. Chihlioreras nathani Grabau p. 48 



Apertural view of the siphuncle shown in the right hand figure of Plate V. to show 

 the main and lateral alveoli. The specimen is slightly crushed, and is weathered. 

 Lower Ordovician Peilintze limestone. Shih-Mun-Chai region, Chihli. (G. S. Ch. 

 Cat. No. 111). 



102 - 



