266 FLOEA OF LOWER COAL MEASURES OF MISSOURI. 



of a narrow Ijorder zone, apparently (xirresponcling to the compressed profile 

 zone of one of the envelopes of a Cordaicarpou, such as C, Guibieri, and the 

 obscurely cordate base, have convinced me that we have really to do with 

 representatives of the latter genus. The reference to Presl's Carpolites cerasi- 

 formis is not without doubt. 



Localities. — Deepwater, U. S. Nat. Mus.. 6164: Hobbs's coal mine, 

 U. S. Nat. Mus., 6165. 



GAEDIOOARPON Broiigniart, 1828. 



Prodrome, p. 87 (pars). 



Cabdiocakpon (Samaropsis) Buanweri Fairch. and D. W. MSS. 



PI. LXXII, Fig. 3; PI. LXI, Fig. le. 



1899. Cardiocarpon Brannerl Faircli and D, W. MSS., D. White, 19th Ann. Eept. U. 

 S. Geol. Surv., pt. 3, p. 534. 



Fruit small, oval or ovate, and slightly prolonged at the somewhat 

 truncate base, 10 to 12 mm. long, 7 to 9 mm. wide, consisting of an ovate 

 nucleus within a relatively wide wing; wing oval, blunt, and incised a little, 

 or very slightl}^ emarginate at the apex, sometimes slightl}' rounded on 

 either side of the micropyle, near which it forms a border 2 to 2.5 mm. in 

 width, narrowing slightly downward toward the lateral angles of the nucleus 

 to 1.5 to 2 mm. in width, then prolonged or dilated in a basal lobe 3 to 6 

 mm. wide, extending 3 to 5 mm. downward and truncate, or truncate 

 roiinded at tlie base, which is often traversed by a fine, clear line passing 

 downward from the nucleus; nucleus ovate-triangular, usually rather obtuse 

 just below the acuminate apex, generally uniform in size, about 7 mm. long, 

 5 mm. wide, broadest a little below the middle of its altitude, either very 

 obtusely rounded or truncate at the base, very thinly lenticiilar in cross 

 section, thickest near the base, or, when flattened, often marked by a small 

 oval medial convexity above the base, above which a line or faint ridg-e 

 passes upAvard to the micropyle. 



The interesting examples of Samaropsis, one of which is figured in PI. 

 LXXII, Fig. 3, are found in the clay ironstone matrix, both with and 

 without the marginal wing. The specimens that are less flattened are but 

 slightly convex and ha\-e but very little adherent carbonaceous residue. 

 The wing, which is peculiarly dilated at the base, differing thus from all 

 the other small species with which I am acquainted, is obviously very thin, 



