GYMNOSPERMS— GORDAITALES— liHABDOCAEPOS. 267 



And_ probably membranaceous. lu one compressed sr[Decimeu the nucleus 

 is bordered by an inter\^ening narrow, minutely rugose-striate zone, about 

 .5 mm. in width, which apparently represents an envelope. The surface of 

 the wing is dull and moderately smooth; that of the nucleus is granular 

 near the base and granular-striate toward the top, as ^aewed by the lens. 

 The illustration of C. Branneri in Fig. 3, PI. LXXII, fails to show the 

 ordinary width of the basal dilation of the wing, or the usually more or 

 less triangular form of the nucleus. 



This species, found quite abundantly at Grilkerson'^ Ford, has also 

 been discovered in the Coal Measures of Arkansas, from which it has been 

 described by Prof. H. L. Fairchild and myself in a report submitted to the 

 State geologist of that State. The upper part of the fruit resembles on a 

 small scale the corresponding portion of the Cardiocarpus orhicidaris Ett.,^ 

 though the basal portion is quite different. It is probably nearest to C. 

 sonulatus Lx.," from which it differs, however, by the much broader down- 

 ward expansion of the wing. The C.fluitans of Dawson^ is somewhat smaller, 

 more distinctly granular, and lacks the pronounced dilation of the wing at 

 the base, while the marginal expansion at the top is proportionally wider. 



Xoca%.— Gilkerson's Ford, U. S. Nat. Mus., 6150, 6157, 6255, 6262. 



EHABDOCARPOS Goeppert and Berger, 1848. 



De fructibus et Seminibns ex Form. Lithanthr., ]). 20. 



Rhabdocarpos (Pachttesta) Mansfieldi Lx. 



1879. Rhahdocarpus Mansfieldi Lesqnereux, Coal Flora, Atlas, p. 18, pi. Ixxxv, fig. 21. 

 1883. Rhahdocarpus Mansfieldi Lesquereux, 13th Eept. Geol. Surv. Indiana, pt. 2, x>l. 



xxii, fig. 7." 

 1889. Rhahdocarpus Mansfieldi Lx., Lesley, Diet. Foss. Pennsylvania, vol. ii, p. 868, 

 text fig. 



1880. Gordaicarpus Mansfieldi Lesquereux, Goal Flora, vol. ii, p. 539, pi. Ixxxv, fig. 21 ; 



vol. lit (1884), p. 916. 

 1880. Gordaites Mansfieldi Lesquereux, Coal Flora, vol. ii, p. 537 (pars), pi. Ixxxvii, fig. 8. 



Several specimens from Missouii agree well with examples in the col- 

 lections of the United States National Museum derived from the type 

 locality, Cannelton, in Pennsylvania, and labeled with the above name by 

 Professor Lesquereux. On one slab three specimens, slightly smaller than 



' Steinkohleufl. V. Stradonitz, pi. vi, fig. 4. 

 -Coal Flora, vol. iii, p. 813, pi. cs, figs. 14-17. 

 ^Contl. Dep. of Coal, pi. xii, fig. 74. 



