82 Cincinnati Society of Natural Historij. 



VEGETABLE KINGDOM. 



SVB-KINGDOMS: 



I. PHCENOGAINIIA. Gr. p/ta«?io, I appear; gamos, marriage; also 



called Flowering Plants. 



II. CRYPTOGAMIA. Gr. kniptos, hidden; yamos; also called 



Flowerless Plants, 



The geological record of the Cincinnati epoch has not furnished any 

 evidence of the existence of Phoenogamous plants. 



SUB-KINGDOM CRYPTOGAMIA. 



Class AcKOGENS. Gr. akros^ the summit; (jennao, to produce. 

 Order Equisetace^e. L. equus, a horse ; seta, stitf hair. 

 Genus SphenophyUum, Brongniart. Gr. sphen, wedge-shaped; phnllo)i, 



a leaf. 



460 SphenophyUum primsevum, Lesquereux. L.^jr/mHA% first; cevum^ 



age. 



Order LYCOPooiACEiE. Gr. lukos, a wolf; pons, jyodos^ foot. 

 Genus Psilophyton, Dawson. Gr. psilos, naked; phuton, a plant or tree. 



461 Psilophyton gracillimura, Lesquereux. L. yracillimus, most slen- 



der. 



Genus Protostigma^ Lesquereux. Gr. protos, first; stigma, a dot. 



462 Protostigma sigillaroides, Lesquereux. L. sigillum, a seal; 



eidos, form. 



Class Thallogens. Gr. thallos, a green branch; gettnao, to produce. 

 Order Alg^:, L. alga, sea weed. 

 Genus Buthotrephis, Hall. Gr. buthos,t\iQ depth of the sea; trejyho, I 



grow. 



463 Buthotrephis gracilis, Hall. L. gracilis, slender. 



464 gracilis var. crassa, Hall. L, crassus, coarse. 



465 ramulosa, S. A. Miller. L. ramulosus, full of little boughs. 



466 succulosa, Hall. L. .s^^c'c^.s-, juice, from the succulent branches. 



Genus Palaiophycus, Hall. Gr. palaios, ancient; phukos, a sea weed. 



467 Pahvophj'cus tubuhire, Hall. L. tubnhis, a little tube. 



