FORMATIONS AND FOSSILS OP SOUTH MANCHURIA 43 



brachial valve, 6 mm ; width of pedicle valve at hinge area, 9.5 mm ; 

 width of brachial valve at hinge area, 8.5 mm. 



Gom'parison. — This species should be compared with Weller's 

 Dalvuinella testudinaria (Dalman) from the Ki-sin-ling limestone, 

 Szechwan, China, but it is distinguished by the less swollen pedicle 

 valve and the comparatively longer hinge line. 



Formation and locality.— Ovdovician: Huang-pa-yi, Shensi, 

 China. 



Cotypes.—U.S.'NM. No. 83631. 



ORTHIS CALIIGRAMMA ORTHAMBONITES von Buch 



:? LATE 23, FiGUEEs 1, 2 ; Plate 27, Figuees 7-10 



1828. Orthis calligramma Dalman, Kongl. Vet.-Acad. -Handl., for 1827, p. 114, 



pi. 2, fig. 3. 

 1845. OrtMs calligramma de Vebneuil, in Murchison, de Verneuil, and de 

 Keysetling, Geologie de la Russie d'Europe et des montagnes de I'Oural, 

 vol. 2, pt. 3, p. 207, pi. 13, figs. 7 a^f, and var. orthambonites von Buch, 

 ibid., figs. 8 a^g, 

 1868. Orthis calligramma Davidson, British Fossil Brachiopoda — Silurian, vol. 



3, p. 240, pi. 35, figs. 18a, 19. 

 1883. OrtMs calligramma Kaysee, in von Richthofen's China, vol. 4, p. 40, pi. 



3, figs. 10-13. 

 1901. Orthis calligramma var. serica Mabteili, Boll. Soc. Geol. Ital., vol. 20, 

 p. 297, pi. 4, figs. 1-4 ; var. davisoni Martelli, idem, p. 301, pi. 45, figs. 5, 6. 

 1913. Orthis calligramma Wellee, Research in China, vol. 3, Carnegie Inst., 



Washington Publ. 54, p. 282, pi. 25, figs. 3-6. 

 1922. Orthis calligramma var. orthambonites von Buch, Grabau, Pal. Sinica, 

 ser. B, vol. 1, fasc. 1, p. 15, pi. 1, figs. 6 a-d, 4 a-c. 

 Grabau recently gave a detailed description and discussion of 

 this variety. The Manchurian specimens, though the majority are 

 broken, agree in all essentials with his figures. 



Surface of the shell is marked by about 19 strong regular rounded 

 ribs, the interspaces between ribs not occupied by longitudinal ribs ; 

 very obscure, fine, concentric growth lines cross the radiating ribs 

 and interspaces. 



The dimensions of two nearly complete specimens, which are illus- 

 trated in this paper, are as follows : Height of pedicle valve, 9 mm ; 

 width, 10.5 mm; height of brachial valve, 6 mm; width, 9 mm. 



Formation and locality. — ^Lower Ordovician, Kangyao and Wuting 

 formations : In the black banded limestones vicinity of Shang-kang- 

 yao, 3 miles south of the Yen-tai colliery, Liao-tung. In the sandy 

 limestone beds of the Wuting formation on the top of Wu-ting hill, 

 3 miles south of the Yen-tai colliery, and in the same beds in the 

 vicinity of the Pen-hsi-hu colliery, Liao-tung, Manchuria. 

 Plesioty'pes.—{].S:^M. Nos. 83632-83634. 



