172 Dr. F. R. Goivper Reed— 



Carboniferous Fossils from Siam. 



By F. R. CowpER Reed, M.A., Sc.D., F.G.S. 



{Concluded from p. 120.) 



Athyris suhtilita (Hall). (PL II, Fig. 10.) 



/^NE internal cast of the pedicle- valve of a species of Athyris 

 ^ seems indistingnisliable from A. suhtilita Hall ' whicli occurs in 

 the Carboniferous of Belgium,^ and has recently been recorded 

 from Eastern Yunnan.'' The general shape and narrow median 

 sulcus, the concentric sublamellose growth-ridges, and small^ 

 parallel dental plates, are well seen in our specimen. 



Spirifer (Reticularia) cf. lineatus Martin. 

 The peculiar and characteristic ornamentation of Sp. lineatus is 

 found on a fragment of a crushed valve in the collection. This 

 well-known species occurs in the Culm of Hagen, according to 

 Nebe,^ as well as elsewhere. 



Camarophoria sp. (PL II, Figs. 11, 12.) 

 There is the flattened impression and the cast of the left half of the 

 valve of a small brachiopod, possessing characters which indicate its 

 reference to the genus Camaroplioria. The beak is not preserved, and 

 it is doubtful if it is the brachial or pedicle valve with which we have 

 to deal. The cardinal angles are rounded ; there are 4-6 faint, 

 low, rounded ribs on each side of a median weak sinus, which also 

 bears two or three ribs, but the lateral portions of the shell are 

 devoid of ribs, and simply show a few strong concentric growth- 

 ridges. These external characters seem to suggest a comparison 

 with C. Dunheri (Roemer) as interpreted by Holzapfel.^ Another, 

 but uncrushed specimen (PL II, Fig. 12) consists of the internal 

 cast of a pedicle-valve, 12'5 mm. long and 15 mm. wide, which, 

 shows the triangular spondylium. 



Productus concentricus Sarres-Kayser. (PL II, Fig. 13.) 



There is one brachial valve of a species of Productus which seems 

 to correspond precisely with the form described and figured by 

 Kayser "^ as Pf. concentricus Sarres, from the Rhenish Culm. Our 

 specimen, which measures 9 mm. in width, shows the ornament 

 and shape distinctly, and is fairly well preserved. Another less 



' Davidson, Mon. Brit. Foss. Brack., vol. ii, pp. 18, 86, 217, pi. i, figs. 21-2 ; 

 pi. xviii, figs. 8-10. 



- De Koninck, Faune Calc. Garb. Belg., vol. iv, pt. vi, p. 73, pi. xviii, 

 figs. 1-4, 12-28. 



2 Mansuy, op. cit., vol. i, fasc. ii, pt. ii, 1912, p. 92, pi. xvii, fig. 2 ; p. 98„ 

 pi. xviii, fig. 6. 



■* Nebe, op. cit., p. 447, t. xiv, fig. 14. 



^ Holzapfel, op. cit., p. 65, t. vii, fig. 8. 



^ Kayser, Jahrb. h. preuss. geol. Landesanst., 1882 (for 1881), p. 83, t. iii, 

 figs. 3, 4. 



