Description of New Fossils from Ohio and Kentucky. 83 
origin of the armlets, the absence of true pinnule, and the presence of 
a long proboscis, are characters very different from those belonging to 
the H. simplex, which may be regarded as the type of the genus. 
I dedicate this beautiful and unique fossil to its discoverer, Mr. 
Ernst H. Vaupel, of this city, who has collected many of our rarest 
fossils, and who is devoting especial attention to our corals. 
Genus Rereocrinous, Billings, 1858, Can. Org. Rem., Dec. 4, 
Under this generic name, Mr. Billings described two species from 
the Trenton rocks of Canada, in the publication cited above. Like 
most of the fossils of the locality whence they were obtained, these 
were in a very poor state of preservation. Enough is shown, however, 
by Mr. Billings’ figures, to make it conclusive that several forms of 
our so called Glyptocrinus should be referred to this genus. Among 
them I should place G. nealli, Hall, G. richardsoni, Wetherby, and the 
species of which the description is to follow. Not wishing, however, 
to be too hasty, I now include, under Reteocrinus, only L. richardsoni 
and &. gracilis. I may add, in order to give authority to this deter- 
mination, that the same opinion is held by Mr. Wachsmuth, of Bur- 
lington, Iowa, who will so group these species in his forthcoming vol- 
ume on the Paleocrinoidea. 
RETEOCRINUS GRACILIS, nov. sp. (Plate IL, fig. 2a, azygous; 2, op- 
posite side). 
Underbasals.—-Five, very small, nearly concealed between the column 
and the greatly developed basals. In the size of these plates this 
species agrees with R. nealli. 
Basals—Five, hexagonal, somewhat higher than wide, squarely 
truncated above, and here forming the base of the interradial space. 
The outer angles of the upper extremity are cut off, forming the articu- 
lar surface for the support of the first radials. From the ‘lateral 
angles thus formed near the center of these plates, they narrow gradu- 
ally to the lower extremity which is rounded. The widest part of the 
plates is at this lateral angle, so that the basals do not join at the 
sides below this point, leaving a suture through which the minute 
underbasals and the top of the column may be seen, and over which 
the center of the first radials rests. The basals are thick and heavy 
plates, the one on the azygous side being slightly wider and shorter 
than either of the other four, 
Radials—First series, five, pentagonal, higher thau wide, squarely 
