6 
AUG. F. FOEKSTE 
The number of stereom-folds in pectinirhomb 1-5 is 3 or 4; in 
pectinirhomb 12-18, about 5 or 6; in pectinirhomb 14-15, about 
7 or 8; and in pectinirhomb 10-15, about 4 or 5. 
Prominent protuberances occupy the middle of all the plates 
belonging to the first three rows. The protuberances of the 
four basal plates project downward, beyond the top of the column, 
for distances approaching or equalling one millimeter. Where 
pectinirhombs are present, the latter encroach on the central 
protuberances, and similar encroachment is noticed also in case 
of the plates bordering on the anal area; the encroachment is 
least in case of plate 7. In some specimens, low ridges connect 
the protuberances of adjacent plates; in others they are absent. 
In their present state of preservation the plates appear smooth. 
Anal area apparently elliptical in form, about 3 mm. in height 
and 2 mm. in width. None of the plates belonging to this area 
are preserved in the specimens at hand. 
Only traces of the food-groove system remain. The ambu- 
lacra recline on the surface of the theca as in other Lepadocystinae, 
In one specimen, one of the ambulacra passes along the upper 
left margin of plate 17 to within one millimeter of the top angle 
of plate 1 1 ; another ambulacrum reaches the upper part of plate 
18, but does not extend nearer than one millimeter to the upper 
margin of that part of the pectinirhomb which is present on this 
plate. In the same manner, ambulacra reach only the top of 
plates 19 and 15. This is true presumably also in case of plate 
16, although this plate is not exposed in any specimen at hand. 
There scarcely is room for more than two or three brachioles on 
each side of each ambulacrum. These brachioles are at least 
5 mm. long, and are directed upward. They are biserial dorsally, 
the plates of the two series alternating. The length of these 
dorsal plates equals or only slightly exceeds their width. The 
ventral side of the brachioles is not exposed in any specimen 
at hand but its probable appearance may be inferred from the 
corresponding parts of Lepadocystis moorei, Meek, a closely re- 
lated species occurring in the upper part of the Richmond group, 
at Richmond, Indiana. In the latter species the covering plates 
on the brachioles are more numerous than the dorsal plates; in 
