PLATE XXXVI. 
Turrilepas flexuosus. 
Page 215. 
Fig. 1. A single minute plate, enlarged to ten diameters, showing the broad, sinuous median depression 
and the lamellose lines of growth. Near the apex of the plate the median depression becomes 
obsolete and the growth lines more closely crowded and transvei-se. 
Corniferous limestone. Canandaigua, Ontario county. 
Turrilepas cancellatus. 
Page 216. 
Fig. 2. A single plate enlarged to ten diameters, showing the distant, elevated, concentric lines of growth, 
and the elevated, interrupted radiating lines. 
Corniferous limestone. Canandaigua, Ontario county. 
Turrilepas Devonious. 
Page 216. 
Fig. 3. A jilate of this species enlarged to six diainetei's, showing the median ridge and the plumose 
appearance of the surface, produced by the closely disposed lines of growth. 
Hamilton grouji. Canandaigua, Ontario county. 
Turrilepas nitidulus. 
Page 218,. 
Fig. 4. A single plate, enlarged to six diameters, showing the very fine concentric striae which become 
obsolete along the faint median depi-ession, the posterior surface being smooth and ornamented 
with transversely parallel rows of conspicuous perfoi'ations. The apex of the plate is restoi-ed 
in outline. 
Hamilton gi-oup. Canandaigua, Ontario county. 
Turrilepas squama. 
Page 217. 
Fig. 5. A plate referred to this species, enlarged to four diameters, showing the deep deflection along the 
anterior margin, the regular and closely crowded concentric striae, and the absence of a median 
depression. 
Hamilton gi-oup. Canandaigua, Ontario county. 
Fig. 6. A valve fenestree referi'ed to this species, eidarged to four diameters. The nucleus is sub-apical, 
and the concentric striae are somewhat more distant than in the associated plates of the species. 
Hamilton gi'oup. Canayidaigua, Ontario county. 
Fig. 7. A portion of an unusually large plate, enlarged to four diameters. 
Hamilton group. Canandaigua, Ontario county. 
Pig. 8. A valve fenestree, enlarged to four diameters, showing the sub-apical nucleus and the fine, closely 
crowded concentric striae. 
Hamilton gi-oup. Canandaigua, Ontario county. 
Turrilepas tener. 
Page 219. 
Fig. 9. A fi-agment of shale, showing the natural size of nine scattered plates referred to this species. 
Hamilton group. Canandaigxea, Ontario county. 
Figs. 10, 11, 12, 13. Single plates taken from the group represented in the preceding figure, each enlarged 
to six diameters. 
Hamilton gi'oup. Canandaigua, Ontario cou7ity. 
Fig. 14. A smaller plate, also enlarged to six diameters, upon which the growth lines are more prominent 
and more distant than in the other si^ecimens figuj'ed. 
Hamilton group. Canandaigua Lake. 
Turrilepas foliatus. 
Page 218. 
Fig. 15. A single, somewhat imperfect plate, enlai-ged to four diameters. The outline of this plate is 
different from that observed in any other species, but its substance and surface markings are 
of similar character, and it is probably correctly referred to the same group of animals. 
Hamilton group. Canandaigua, OntaHo county. 
