48 Cituinnati Society of Xatural History. 



Scolithus dispar, U. P. James as Eophytox linn^anum, 

 Torell. 



Lockcia si/iquaria, James, see as Dawsonia siliquaria. U. 

 P. James (sp.) under Hvdrozoa. 



Butliotrcphis gracilis, Hall, see as Dendrograptus GRA- 

 CILLIMU^NI, Lesqx (sp.). Syn. Psilophyton. 



RHIZOCARPE.4{. 



An order of Heterophyta (Cryptogamia) represented in 

 existing floras by about four genera and fifty species. Mostly 

 aquatic, producing two kinds of spores. Leaves either simple 

 or quadrifid. 



Sphenophyllum, Brongniart. Hist, de Veg. P'oss, 1828, p. 

 68. Lesquereux, Am. Phil. Soc , Proc, vol. 17, 1877, p. 167. 

 Lesquereux, 2d Geol. vSur. Penn. P, Coal Flora, text, vol. r, 

 1880, p. 51. 



Stem articulate ; leaves verticillate, cuneiform, crenulate, 

 dentate or lobed at the apex, which is truncated or rounded ; 

 midvein wanting ; nerves straight, diverging fan-like, simple 

 at the base, dichotomously forking once or twice. 



S. PRiMv^vuM, Lesqx. Am. Phil. Soc. Proc, vol. 17, 1877, 

 p. 167. 



Stems or branches slender ; articulations close, equidistant ; 

 leaves in whorls, each of four or five leaflets, connected 

 toward the base and joined by slightly obtuse sinuses ; 

 leaflets either truncate or crenulate at the apex, or sometimes 

 deeply split or lobed ; nerves simple at the base, sparingly 

 dichotomous, forking once or simple. The only species of 

 the genus so far known from this group. 



Localitiis. — Covington, Kentucky ; Limekiln Run, near 

 Cincinnati, Ohio. 



LVCOPODI.VCE.E. 



An order of Heterophyta which, in llie existing flora, is 

 small and of little consequence, though of large size in Car- 

 l)()niferous times. It comprises at present only four genera, 

 and from sixty to seventy species. The Club-mosses are the 

 best known li\ing representatives. These are small, low- 

 growing ])lants, with scale-like leaves and minute spores, pro- 

 duced either in the axils of the leaves or in cone-like bodies 



