PLATE ITT. 



Ordomcian Gastropoda; Lower Ordomcian: Peilintze and Liangchiashan Limestones; 

 Upper Ordovician: Machiakou Limestone. 



Drawings l>y K. C. Lin (fiJptJfeft) 



Fig. 1. Loplionpim morrisi Grabau p. 25 



A nearly complete characteristic specimen, enlarged twice. Machiakon limestone, 

 Tangshan, Chihli. (Cotype. G. S. Ch. Cat. No. 32, collected by Messrs. Morris, 

 Bar hour and Terrill). 



Fig. 2. Lopliospira morrisi Grabau p. 25 



2a. View of the spire from an oblique angle, to show the position of the peripheral 



band, and the growth-lines upon the shoulder X 2. 



2b. A portion of the shoulder of the ultimate whorl enlarged six times to show the 

 nature of the peripheral band and the growth lines. Machiakou limestone, 

 Tangshan, Chihli. (Cotype, G. S. Ch. Cat. No. 51; Coll. G. B. Barbour). 



Fig. 3. Lnphnspira pnlcheUiformis Grabau p. 26 



Spire of a characteristic specimen x 2, viewed slightly from above, (with resulting 

 foreshortening), to show the peripheral band. Machiakou limestone, Tangshan. 

 Cotype, G. S. Ch. Cat. No. 51; Coll. G. B. Barbour). 



Fig. 4. Lophospira pulchellif minis Grabau p. 2fi 



Portion of a spire, lateral view X 2. showing amount of embracing, form, and 

 strong lower carina. Machiakou limestone, Tangshan. (Cotype, G. S. Ch. Cat. 

 No. 41; Survey Coll). 



Fig. 5. Lophospira trocliiformis Grabau p. 27 



5a., 5b. opposite sides of the holotypo, showing the trochiform spire and strong 

 peripheral carina. x 2. Machiakou limestone, Tangshan. (Holotype, G. S. Ch. 

 Cat. No. 40) . 



Fig. G. Lophospira acuta Grabau p. 27 



An average specimen,. with a small mass of matrix adhering and the basal portion 

 imperfect x 2. Machiakou limestone, Chao-Kou-Chuang. (Cotype, G. S. Ch. 

 Cat. No. 47) . 



Fig. 7. Lophospira gerardi Grabau .p. 28 



A typical specimen from the Machiakou limestone at Chao-Kou-Chuang, Chihli. 

 Enlarged twice. (Cdype, G. S. Ch. Cat. No. 44). 



Fig. S. Lopliospira gerardi var. laxa Grabau p. 28 



The Holotype, showing the lax whorls entirely free at the aperture, the strong 

 subsutural ridge and marked concavity of shoulder x 2. Machiakou limestone, 

 Chao-Kou-Chuang. Chihli. (Holotype, G. S. Ch. Cat. No. 49). 



Fig. 9. Lophospira terrassa Grabau p. 29 



View of the type, attached to rock, twice natural size. Machiakou limestone, 

 Tangshan, Chihli. (Holotype, G. S. Ch. Cat. No. 33). 



Fig. 10. Lophospira obscnra Grabau p. 30 



The type specimen, embedded in rock and partly worn so as to show the internal 

 mold "x 2. Machiakou limestone. Tangshan, Chihli. (G. S. Ch. Cat. No. 37). 



1 1 . Pagndispira dcnnd-u i.i Grabau P- 31 



The type specimen, twice enlarged. The aperture is restored. Machiakou 

 limestone, Chao-Kou-Chuang, Chihli. (Holotype, G. S. Ch. Cat. No. 45). 



108 



