443 Systematic Paleontology 



5 mm . to 10 mm, in diameter and 1 cm, to 1.5 cm, in length, made up 

 of a small number of relatively thick, wedge-shaped, peltate scales, be- 

 coming somewhat spreading with age. 



This species may be distinguished from Sphenolepis Kurriana (Bun- 

 ker) Sehenk with which it was confused by Professor Fontaine by the 

 method of branching and by its longer and more slender twigs as well 

 as by the usually more spreading leaves of Sphetiolepis. The material 

 which constituted the species tenuicaulis and pachypliylla of Fontaine 

 is not separable from that of the type. It comes from the same beds 

 and differs merely in the condition of preservation and relative positions 

 of the twigs upon the branch. Under Arthrotaxopsis grandis was also 

 included originally certain material from near Brooke, Virginia, which 

 is referable to SpJienolepis. Both the foliage and the cones are common 

 in the Patuxent and Arundel formations and, so far as known, they 

 do not extend above the top of the latter. Very ambiguous material 

 from the Hay Creek beds of the Fuson formation in Wyoming are 

 referred to this species by Fontaine. 



Occurrence. — Patuxent Foemation. Springfield, Fort Worthing- 

 ton (Baltimore), Maryland; Dutch Gap and Fredericksburg, Virginia; 

 16th St., District of Columbia. Arundel Formation, Tip Top, 

 Arlington, Bay View (cones and foliage common), Maryland; Langdon, 

 District of Columbia, 



Collections. — U. S. liTational Museum, Johns Hopkins University. 



Genus SEQUOIA Endlicher 

 [Synop. Conif., 1847, p. 197] 



" Flores in diversis ramulis monoici. Staminig. Amenta axillaria 

 globosa, subspicata, perulata. Stamina plurima, axi inserta; filamenta 

 brevissime filiformia, in connective squamulam late ovatum, verticalem 

 producta, antherse loculis duobus, connectivi basi continuis, discretis, 



parallelis, postice longitudinaliter bivalvibus. Seminif. Amenta 



Strobilus subglobosus, squamis coriaceo lignosis, suborbicularibus, ungue 

 brevi excentrico peltatis, lamina rugosa margine involuta, medio breviter 

 mucronata, persistentibus. Semina subquavis squama 5-7, infra ejusdem 



