PLATE III 
Fig. 1. Agelacrinus vetustus, sp. nov. The granulation probably is due to a 
thin membrane of Dermatostroma covering the entire animal even before deaths 
but permitting the opening of the ambulacral rays, the peristomial plates, and the 
anus. From Clays Ferry, 14 miles southeast of Lexington, Kentucky ; in the fossil- 
iferous strata between 38 and 69 feet above the massive limestone, near the watering 
trough on the south side of the Kentucky River. Greendale member of the Cyn- 
thiana formation. Magnified 5 diameters. 
Fig. 2. Hemicystites carnensis, sp. nov. Two specimens on the same rock 
fragment, in contact with each other, A being located on the right and slightly 
below B, when oriented as in these figures. Both specimens preserve traces of the 
interambulacral plates in the area on the left of the anterior ray. The covering 
plates are best preserved in specimen A, and this specimen also exposes the nearly 
horizontal plates belonging to the inner band of the peripheral ring, along the 
lower margin of the theca. Several hundred yards up the creek from the rail- 
road at Carntown, Kentucky. At the Strophomena vicina horizon, correlated 
with the strata immediately below the Brannon siliceous limestone, in the Trenton 
of Central Kentucky. About 20 feet above the level of the Ohio River. Magni- 
fied 5 diameters. 
Fig. 3. Thresherodiscus ramosa, Gen. et sp. nov. The floor plates are exposed 
along most parts of rays Nos. 1, 2, and 3. (See text figure of ray system, page V.) 
Lateral covering plates are seen along the upper side of the left primary ray, on 
the left side of ray No. 1, on the upper side of ray No. 4, and on the left side of ray 
No. 5. The central or median covering plates are present on various branches of 
rays Nos. 4 and 5, but are not distinguishable in the figure. Th^ large central 
interambulacral plates are surrounded by a series of much smaller interambulacral 
plates which border upon the rays. From the Kirkfield or Curdsville member of 
the Trenton, along the railroad at the northeastern edge of Goat Island, north- 
east of Little Current, the chief village on Manitoulin Island, in Lake Huron. 
Magnified 5.7 diameters. Specimen No. 8446 in the collections of the Geological 
Survey of Canada, in the Victoria Memorial Museum, at Ottawa, Canada. 
Fig. 4. Agelacrinus faberi. Miller. Rest ng on Hebertella alveata, Foerste. 
The granulated surface seen on various plates is regarded as due to a coating of 
some Dermatostroma. Near the central part of the figure two floor plates are 
shown at a point ind ented by a tiny white arrow. Type, form’ng No. 8821 in the 
Faber Collection at Chicago University. Probably from the Whitewater member of 
the Richmond, immediately above the typical Saluda, at the exposure on the road 
side half way between Versailles and Osgood, along the road leading northward 
from the northeastern corner of the town square, at Versailles, Indiana. Magnified 
4.5 diameters. 
480 
