EQUISETALES— CALAMARIE^E— MACROSTAOriYA. 171 



of which intervene between two verticils of the large cicatrices, all of the 

 latter being', so far as known, large and equal. 



Localities. — Owen's bank; also one from the same locality loaned bv 

 Dr. Britts ; still another from Henry County, Missouri, without ^Ji'ecise 

 locality, U. S. Nat. Mus., 5466. 



MACEOSTACHYA Scbiiuper, 1869. 

 Traite paleont. veg., vol. i, p. 333 (pars). 

 Macrostachya longifolia Lx. MSS. 



A good specimen in the recent collections appears to belong to a new 

 species with the above name represented in the manuscript material of Pro- 

 fessor Lesquereux, now in my hands for preparation for publication. 



Not wishing- to anticipate its publication, along with many other inter- 

 esting forms included in the unpublished work of the distinguished paleo- 

 botanist, I give here the nomen nudum merely as a matter of geological 

 and geographical record. 



It is possible that the stems from the same locality referred to Cyclo- 

 cladia may belong to the same plant. 



Locality. — Owen's coal bank, U. S. Nat. Mus., 5467. 



IIvrOERTiE SEDIS. 

 EADICITES Potonie, 1893. 



1825. Hydatica Artis, Autedihivian Phytology, pi. i (pars), pi. v. 



1834. Pinnularia Lindley and Huttou (non Ehrenb.), Fossil Flora Gt. Brit., vol. ii, p. 



81, pi. iii. 

 1847. Bhizolitlies Braun, Flora, N. R., vol. v, No. 6, p. 86 (pars?). 

 1893. Badicites Potonie, Flora Eothl. Thiiringen, p. 260. 



In noting the occurrence of rootlets of the type commonly known as 

 Pinnularia in the outlying coal basins of southwestern Missouri,^ I took 

 occasion to point out the fact that Lindley and Hutton's name is objection- 

 able, having been preoccupied by Ehrenberg for a genus of diatoms, many 

 species of which have been found fossil. Among the names previously 

 employed to designate such remains, Hydatica and Myriophyllites of Artis 

 appear to be either too comprehensive in their scope or too uncertain in 



' Bull. U. S. Geol. Surv., No. 98, 1893, p. 43. 



