PLATE XXXVI—Continued. 
Tdrrilepas (?) Newberryi. 
Page 219. 
Fig-. 16. T-wo valves of this species in an uncompressed condition, natural size. The upper and more per¬ 
fect specimen has a rounded dorsum, the unrepresented side being of the same. character as 
that which is shown. There also appears to be evidence of a cleft extending from the apex to 
the antei-ior margin, as in Spathiocaris. Plates of this character are distinctly diffei-ent from 
the others here represented under the term Turrilepas. 
Cleveland shale (Chemung group). Birmingham, Erie county, Ohio. 
Fig. 17. A large plate, natural size, showing the concentric surface markings, and a bi-oad postero-lateral 
depression. This plate has the same outline as one side of the plates i epresented in the last 
figure ; it is, however, impossible to determine from the specimen whethei- or not the plate was 
folded along the dorsal line. 
Cleveland shale (Chemung group). Sheffield, Erie county, Ohio. 
Fig. 18. A smaller plate, natural size, showing a different foi-m and more closely crowded growth-lines. 
Cleveland shale (Chemung group). Sheffield, Erie county, Ohio. 
Fig. 19. A small plate having an outline similar to that represented in figure 17. 
Cleveland shale (Chemung group). Sheffield, Erie cotmty, Ohio. ' 
The illustrations of this species have been drawn from the type specimens. 
Strobilepis spinigera. 
.Page ‘212. 
Fig. 20. A nearly entire capitulum, in which the parts retain somewhat of their proper arrangement. The 
conical terminal plate is overlapped at its edges by three vertical ranges of plates, those of the 
left range lying in juxtaposition, while those of the i-ight i-ang-e have been considerably dis¬ 
placed. Of the axial range of smaller plates, three are shown in place, and a fourth plate of this 
range lies beneath the edge of the fourth plate of the left range. The i-ange of spines has been 
pushed fi-om its normal position around to the right, and the lower membei-s of the row have been 
displaced. These spines wei-e probably symmetrical in position with the axial row of plates. 
The specimen is enlarged to one and a half diameters. 
Fig. 21. The last three spines of the undetached poi-tion of the row, enlarged to two diameters. These 
spines are numerically the ninth, tenth and eleventh ; the first two, like all those preceding 
them, bear a deep and conspicuous groove for nearly their entire length, while the eleventh and 
all those following, appeal- to have been inverted, showing a convex surface with a sharp axial 
Carina, the lateral slopes being more or less incurved. 
Fig. 22. An enlargement of a portion of the surface of one of the plates, showing their punctate structure, 
the quincunx arrangement, the oblique direction of the punctse, and the concentric lines pro¬ 
duced by the excavation of the shell about the aperture of each puncta. 
Hamilton group. Menteth's Point, Canandaigua Lake. 
Protobalanus Hamiltonensis. 
Page 209. 
Fig. 23. The type specimen enlarged to fifteen diameters. This has been somewhat broken over the pos¬ 
terior portion, but shows the composition of the capitulum, its twelve discrete plates, consisting 
of the carina, rostrum and five pairs of lateralia, tlie radiating ridges upon the surface of these 
plates and the smooth radial areas. On the right side the peripheral portion of the shell has 
been somewhat flattened. 
Hamilton group. In the Marcellus shales at Avon, Livingston county. 
Palasocreusia Devonica. 
Page 210. 
Fig. 24. A view of the type specimen, natural size, showing the capitulum, the remainder of the shell being 
imbedded in a colony of Favosites hemisphericus. 
Fig. 25. A constructive i-epresentation of the profile of this specimen, showing the long, tubular basis sur¬ 
rounded by cell tubes, and the elevation of the capitulum. 
Fig. 26. The same view of the specimen as that presented in fig-ure 24, eidarged to two diameters. The 
capitulum has been encroached upon by the walls of the cell tubes, which have apparently ex¬ 
tended as far as the aperture, and.subsequently been broken away. The surface of the j-)late 
shows faint radiating striae, and a single furi-ow concentric with the margin. The aperture 
appears somewhat too lai-ge on account of the slight im^ierfection of its anterior margin. 
Corniferous limestone. Ijcltoy, Genessee county. 
