154 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
have been suppressed, and there are 10 /Br. This is abnormal and 
may be due to regeneration. The //Br vary in number from four 
to eight. Above the /ZAw the rami of each half-ray show endoto- 
mous branching, the number of Br between axillaries steadily increas- 
ing in number distad. The 7Aw and //Azw are nodose, but the axil- 
laries above are, as a rule, spinous. In the proximal portion of the 
arms the Br have subparallel faces, but passing distad they become 
cuneate. The pinnules as a rule are poorly shown. They are of 
moderate length and slender. 
The ventral sac is long, reaching to the tips of the arms, at least 
in medium-sized specimens. In larger specimens the arms may 
well have extended above the top of the sac. The ventral sac is 
composed of numerous vertical series of fairly small nodose plates. 
The walls of the sac seem to have been incompetent, for, as seen, 
the sac is flattened, distorted, and thrown into folds. The apex of the 
sac seems to have been somewhat flattened and carries a marginal 
fringe of stout spines. 
The column is stout, circular in section, and has a pentalobate 
lumen. The nodal and internodal series are well marked, the nodals 
being unusually prominent. In the holotype cirri are borne by the 
nodals to within 8 cm. of the crown. 
Relationships—¥rom Rhopocrinus proboscidialis, R. spinosus may 
readily be distinguished by its broadly turbinate cup. The RA of R. 
municipalis are more highly arched, the /Br are relatively narrower 
and higher, and the arms relatively more slender for specimens of 
the same size than in 2. spinosus. 
Horizon and locality —The types and only known specimens of the 
species are from what is known as Glen Dean near Sloans Valley, 
Pulaski County, Ky. The specimens are from the railroad tunnel 
and were collected by Bernhardina and Charles Wachsmuth. 
Types.—The holotype, No. $4409a, and paratypes, No. S4409b, c, 
are in the Springer collection in the United States National Museum. 
RHOPOCRINUS MUNICIPALIS (Troost), new combination 
Rhopocrinus municipalis is represented by a badly preserved, 
silicified specimen, the holotype, and one even poorer specimen in 
the same block of limestone. The type shows part of the dorsal 
cup and portions of the arms. The state of preservation 1s so poor 
that it is doubtful whether the species can be identified with certainty 
in the future unless a series of well-preserved specimens can be 
found. 
The crown has an approximate height of 9 cm. The arms, when 
the size of the cup is considered, are relatively slender and are well 
