306 The American Geologist. May. rate 
and overhang the plates below. Brachial scar rounded and 
nearly horizontal. Arm plates heavy like those of Bary- 
crinus. The anal plate is pentagonal. The first radials each 
have a central short tubercle and the surface of all the plates 
is beautifully granular. The plate sutures are depressed. 
Found by Mr. Z. T. Snively in the Keokuk group on Fox river, 
near Wayland, Mo. 
In the author’s collection. 
Lobocrinus dubius, n. sp. 
PLATE XVIII. 
Fic. 11. Anal side view of the body of the type specimen 
The basal plates extend obliquely outward as rather thin, 
sharp expansions after the manner of Eretmocrinus. The 
first radial plates are a little broader than long and although 
separated from each other and surrounding plates by deep 
rounded grooves are themselves flattened on the outer surface. 
The second radials are quadrangular and hardly broader than 
long, verrucose. The third radials are broader than long 
and, as axillary plates, support above, two primary rad- 
ials each, of a secondary series. These latter support a second 
plate that is axillary, bearing on its left, sloping upper side an 
arm base and on its right a radial plate of the third order, 
directly under an arm base. The lower plate of each inter- 
radial area is large, as broad as long, and flattened on the 
outer surface as in the first radials, supporting above a much 
smaller plate (two in the left antero-lateral interradius). 
Above this first interradial is a minute plate, (One area has 
still another smaller plate above while.one other has but two 
plates altogether). The first plate of the anal interradius is 
as long as broad and seven sided, flattened on the outer sur- 
face and supporting above three wart-like plates. Above 
these latter are two small plates. All of the dorsal plates are 
strongly verrucose. 
The ventral disk is hardly convex with plates but slightly 
nodose. The base of the anal tube is nearly central and the 
plates are heavy, while the tube itself is but moderately large. 
The grouping of the arm bases forms five not very distinct 
lobes, each giving rise to four arms, except the anterior which 
has but two, eighteen in all. 
‘are same) TY 
