Dend. 196 



bank, Lebanon Co., Pa. (O, p. 187, spec. 4056.) II g.—Lowqv 

 Held, limestone bed, 19, Dunnings Narrows, Juniata river gap, 

 Bedford Co. (T, p. 192,) VI ; — In Pocono sandstone at Mauch 

 Chunk and a thousand other localities. X, XI 



Dendrocrinus ancilla. F5. See Appendix, 



Dendrograptus novellus. VI. See Appendix, 



Dendrophycus desorii. Lesq. {Besmarestia, Rogers, 

 pages 830, 884, plate 23.) Found at Mauch Chunk, Pa., in the 

 top beds of the Red shale formation (No. XI) or in the bottom 

 beds of the Conglomerate (No. XII), fifty years ago, and after- 

 wards abundantly in the Susquehanna gap above Pittston, and 

 lately (1884) discovered in "splendid specimens" in a clay 

 dyke traversing Corniferous limestone beds (For. VIII a) at 

 Davenport, Iowa. A type of seaweed far more highly developed 

 than any of the more ancient algae. Lesq. Coal Flora, Vol. 3, 

 1884, p. 700, pi. 88, fig. 1.— Prof. Balfour's letter to Prof. Rogers, 

 in Geol. Pa., 1858, suggested its affinity to Desmarestia ; which 

 Lesquereux does not accept, preferring the strong, rooting, 

 horizontal CaulerpcB, or Syphonacece. — Dawson says that it is 

 probably not a plant at all, but a fossil cast of the rill-marks 

 which little waves make in retreating to the edge of the shore ; 

 and he includes the Aristophycus,, Clcephycus^ and Zygophycus 

 of Miller & Dyer from the Lower Silurian. See Geol. Hist, of 

 Plants, 1888, p. 33.— Reported by White (G7, p. 60) in bed 28, 

 of Catawissa section, Catskill strata; in bed 21 and 32 of the 

 Coxton section along the river above Pittston (G7, p. 61). — 

 CatsMll IX.— For Hgure see page 197. 



Dentalina priscilla. Dawson, Acadian Geology, 1868, 



page 285, fig. 82, natural size? 

 and also magnified six tim.es ; 

 a little shell very abundant on 

 the surfaces of bed 5 of the 

 Lower Carboniferous limestone 

 ccco 1868. p. 285. of Wludsor, N. S. — XI 



Desmarestia. Se Dendrophycus desorii. XI 



Desmidiacese, and Diatomacese, perhaps took part in the 

 production of petroleum. (Rt. I, p. 107.) 



