J. M. Clarke—Devonian Spores. 285 
the pint Ptilophyton Vanuxemi. Dr. Dawson also mentions 
spore-like bodies in association with the stems of 
Troclopyliin of _Lesquereux, from the lower Carboniferous 
ennsylvania.” In the Mato tas beds of Ontario county 
Say occur with Pslophyton sp., and in the Genesee Shales 
with Cyclostigma affine Dn. and Lepidodendron Gaspianum Dn. 
From my observations, however, plant remains in rocks con- 
taining Sporanjite Huronensis are ex xtremely rare, the fossils 
er eee accompanying them being invertebrate marine species. 
the Minneapolis meeting of the A. A. A. S., 1883, Dr. 
Seen in the article already referred to, viz: ‘On Rhi izocarps 
in the Paleozoic Period,” suggested the probability of the spores 
or spore-cases representing the species Sporangites Huronensis, 
having been the fruit of some acrogenous plant of aquatic 
habit allied to the Salvinia natans of European rivers, an 
apa: this described forms accompanied and contained * 
cataddae of sporocarps contai spores and their close 
Similarity to those of the © exis sting aaa represented by 
Salvinia natans and othe 
f the vegetative portions of the plants iene, these 
Spores nothing is positively known. Dr. as given 
reasons for believing the species of Prilophiton + 3 have been 
aquatic in habit, and allied in fructification to the Rhizocarps. 
uring a series of years many specimens of Devonian rocks 
bearing spores have come into m y hands from the Corniferous, 
Marcellus and Genesee horizons in the county of Ontario, N. Y. 
county, Ohio, and by Dawson from Kettle Point. The calca- 
reous beds of the Corniferous and Marcellus preserve the 
spores with but little or no distortion, and specimens recently 
discovered in the latter horizon retain both oomtgnanit= snd 
Am. Jour. Scr.—Tu1rp Serres, Vou. XXIX, - 172. cy at 1885. 
20 
