PLATE XXV. 
Calymene platys. 
Page 1. 
See Plate 1. 
Fig-. 1. An extremely large pygidium, retaining only a small portion of the crust. Accompanying this is 
an outline restoration dra-wn upon the basis of this pygidium, to indicate the dimensions the 
animal may have attained when entire. Normally the pygidium of the animal is somewhat 
incui'ved, as shown in tig. 2. In this drawing- the pygidium is viewed from behind, and not 
from above, appearing therefoi-e detached fi'om the restored thorax. 
Corniferous limestone. Falls of the Ohio. 
Fig. 2. A large, somewhat imperfect individual, retaining the parts in juxtaiiosition. 
Itpper Helderberg limestone. Hagmsville, Province of OntaHo. 
[ ? ] Phacops RANA. 
Page 19. 
See Plates 7, 8 and 8 A. 
Fig. :i. A cephalon from which the crust has been removed ; showing the glabellar furrows, the deep and 
broad occipital furrow, made moi-e conspicuous by the obsolescence of the third oi- basal lobes. 
Fig. 4. A protile view of the same, showing the somewhat protubei-ant and slightly flattened glabella, 
the subangulate genal extremities and the elevated occipital ring. 
This specimen is from the Eureka District, Nevada, and shows a close i-elationship to Phacops 
crlstata in the bi-oad and dcep°occipital furrow and other features. (See page 25.). 
LiCHAS (UoPLOLICIIAS) IIYLiEUS. 
Page 81. 
See Plate 19 b. 
Fig. 5. An hypostoma, found in association with the cephalon of this species. Eulai-ged to two diameters. 
Upjier Helderberg limestone. North Cayuga, Province of Ontario. 
1‘rOETUS DELPHINULUS. 
Page HI. 
See Plate 23. 
Fig. B. The cephalon represented on plate 23, tigs. 1 and 2; drawn from a gutta-percha impression from 
a natural mould of the doi-sal surface, showing the character of the glabellar lobes and fur¬ 
rows. Enlarged to three diameters. 
Proetus jejunus. 
Page 124. 
Fig. 7. The pygidium enlarged to two diameters ; showing the axial row of nodes and the broad pleurae 
with their bifurcate anuulations. 
Hamilton group. Albany county. 
Proetus crassimarginatus. 
Page 99. 
See Plates 20 and 22. 
Fig. 8. The axis of the pygidium enlarged to two diameters. The internal cavity of the axis has been 
tilled with ti-ansparent calcite. and by the removal of the outer portion of the test, the position 
and chai-acter of the muscular scars upon the lower surface are very distinctly shown. 
Corniferous limestone. Falls of the Ohio. 
