Agelacrinidae and Lepadocystinae 
449 
the plates of the outer margin very small and arranged in a narrow rim 
all around, the larger plates taking their place abruptly. About one 
line or a little more inward the surface becomes suddenly depressed, 
causing quite a sharp outward ridge, in most cases all round, by the 
projecting edges of the plates; and then rises, gently at first, but abruptly 
nearer and to the center, forming a somewhat prominent dome. The 
rays or arms nearly hidden by the imbricating plates in all the specimens 
examined; but occasionally some of the arms are partly but indistinctly 
shown, as is the case in the figured specimen. The ovarian aperture 
(anus) is hidden, probably, in the same way, it not being shown in any 
one of the specimens. All but one of the ten examples used for this 
description show the above specified characters, and that one is, evidently 
in an abnormal condition by lateral pressure. 
Found by Dr. T. D. Dyche, of Lebanon, Warren County, O., in beds 
of the Cincinnati Group, equivalent to the tops of the hills at Cincinnati. 
The type specimens are in Dr. Dyche’s fine collection. 
According to Dr. Dyche, the type locality was a short distance 
up a small branch entering Second Creek at the first bridge east of 
Morrow, in Warren County, Ohio. The types were associated 
with Dalmanella multisecta, in the same rock. Two of the type 
specimens were presented to me by Dr. Dyche. 
The presence of Dalmanella multisecta suggests the Fairmount 
member of the Maysville, since nothing lower than this member 
is shown along Second Creek. 
At the same locality, east of Morrow, I have collected Phyllo- 
porina clathrata, Plectorthis equivalvis-latior, Plectorthis equivalvis- 
pervagata, Playtstrophia of the ponderosa type but rare, Rafines- 
quina squamula, Zygopira cincinnatiensis large, Protowarthia 
morrowensis (= cancellata), Dalmanites carleyi, and an Isotelus 
with a genal spine three-fourths of an inch long. About a mile 
east of Morrow, Rafinesquina ponderosa, characterizing the Belle- 
vue horizon, is common. At a higher level the Corryville comes 
in. 
The impression produced by the types of Agelacrinus warrensis 
is that of a suite of young individuals of Agelacrinus cincin- 
natiensis. As far as the sudden depression within the peripheral 
ring and the dome-like elevation at the center are concerned, these 
are not diagnostic features at all, but merely indications of rapid 
decay of the underlying viscera after the death of the animal, the 
inner band of the peripheral ring and the central or substomial 
chamber being most rigid and retaining their form best. More- 
over, the ambulacral rays and the anus are hidden only in the 
