PLATE V 
Fig. 1. Lepadocystis moorei, Meek. A, anterior view, exposing plate 15 and 
the anterior subvective food groove; also pectinirhombs 14-15, and 10-15. B, 
posterior view, showing pectinirhomb 11-17 on left side, pectinirhomb 12-18 near 
median line, and anal pyramid on right side of figure. Also right and left posterior 
subvective food grooves, with all of the distal floor plates dropped off in case of the 
right ambulacrum, and all but the terminal one of the distal floor plates gone in 
case of the left ambulacrum, in both cases leaving flattened surfaces, indicating 
the paths of the ambulacra. C, Left side of specimen A, broken at the base; with 
pectinirhombs 1-5, and 11-17; also the left anterior and left posterior branches of 
the subvective system. D, View of specimen B, from above, showing the subvective 
system, with the anterior branch directed toward the top of the figure. Along the 
lower margin of this figure the position of pectinirhombs 11-17, and 12-18, and 
location of the anal pyramid are indicated, indistinctly, in the shadows. Speci- 
mens No. 9961, in the Faber Collection at Chicago University. Figures A and C are 
prepared from the specimen lettered A ; and figures B and D, from the specimen 
lettered B. From the Whitewater division of the Richmond, at Richmond, 
Indiana. Figures A, G, magnified 5.3 diameters. Figures C, D, magnified 4.7 
diameters. 
Fig. 2. Brockocystis tecumsethi, Billings. Genotype, and neotype of the 
species. A, View of top or oral end of specimen, but with anterior groove of sub- 
vective system directed toward the right. The large cavity on the right indicates 
the locatioin of that part of the pectinirhomb 10-15 which is found on the nearly 
hemispherical i)late 10. The cavity adjoining the lower left hand margin of the 
latter, in the figure, is the remainder of the pectinirhomb, with most of the stereom 
folds weathered out, and is located on plate 15. The cavity just beneath is the 
upper right hand side of that part of pectinirhomb which is located on plate 15. 
The longitudinal cavity on the left side of the figure is bordered on the left by the 
remains of the stereom folds on plate 12. The distal floor plates of all branches of 
the subvective system, excepting the right posterior branch, are missing and have 
left flattened areas on the theca. Traces of the hydropore and gonopore apparent- 
ly present on the left of the center of the subvective system. B, posterior view; 
the large cavity locates pectinirhomb 12-18, The absence of the pectinirhomb on 
plates 11-17, immediately on the left of this cavity, is well shown. Pectinirhomb 
1-5 is seen at the lower left hand margin of the figure. The anal area lies in the 
most deeply indented part of the outline on the right hand margin of the figure. 
C, View o ' right anterior side of specimen. The large cavity on the left side of 
the figure locates the anal area. Pectinirhombs 14-15, and 10-15 clearly indicated ; 
also the flattened surfaces on the theca left by the dropping off of the floor plates 
from the distal ends 5f the branches of the subvective system. From the top of 
the Cataract limestone, on the road from Gore Bay to Kagawong, at the first wet 
weather stream crossing east of Ice Lake, on Manitoulin Island, in Lake Huron, 
A, Magnified 4.7 diameters; B, C, magnified 3 diameters. Specimen No, 847 in 
the collections of the Geological Survey of Canada, in the Victoria Memorial 
^Museum, at Ottawa, Canada. 
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