PLATE XXXVI. 



TlTRRILEPAS FLEXUOSI g. 



Page 215. 



Wig, 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 b< mes 



obsolete and the growth lines more doselj crowded and ti'ansverse. 

 Corniferous limestone. Canandaigua, Ontario county. 



TURRILEPAS CAXCKI.LATUS. 

 Page -216. 

 Fif. 2. A single plate enlarged t" ten diameters, showing the distant, elevated, concentric lines of growth, 

 and the elevated, interrupted radiating lines. 



Corniferous limestone. Canandaigua, Ontario county. 



Tuiuui.epas Devonicus. 



Page 216. 

 Pig. 3. A plate of this species enlarged to six diameters, showing the median ridge an. I the plumose 

 appearance of the surface, produced by the closely disposed tines "I growth, 

 Hamilton group. Canandaigua. Ontario county. 



TURRILEPAS NITIDUHs. 

 Page 218. 

 Fig 4. A single plate, enlarged to six diameters, showing the very tine concentric stria- which become 

 obsolete along the faint median depression, the posterior surface being smooth and ornamented 

 with transversely parallel rows of conspicuous perforations. The apex of the plate is restored 

 in outline. 



Hamilton group. 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 stria 3 , and the absence of a median 

 depression. 



Hamilton group. Canandaigua, Ontario county. 

 Fig 6. A vatve fenestree referred to this species, enlarged to four diameters. The nucleus is sub-apical, 

 and the concentric stria' are somewhat more distant than in the associated plates of the species. 

 Hamilton group. Canandaigua, Ontario county. 

 Fig. 7. A portion of an unusually large plate, enlarged to four diameters. 



Hamilton group. Canandaigua, Ontario county. 

 Fig. 8. A valve fenestree. enlarged to four diameters, showing the sub-apical nucleus and the tine, closely 

 crowded concentric stria 1 . 



Hamilton group. Canandaigua, Ontario county. 



TURRILEPAS TENER. 

 Page 219. 

 Fig. 9. A fragment of shale, showing the natural size of nine scattered plates referred to this species. 



Hamilton group. Canandaigua, Ontario county. 

 Figs. 10, 11, 12, 13. Single plates taken from the group represented in the preceding figure, each enlarged 

 to six diameters. 



Hamilton group. Canandaigua, Ontario county. 

 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 specimens figured. 

 Hamilton group. Canandaigua Lake. 



TURRILEPAS FOLIATUS. 

 Page 218. 

 Fig. 15. A single, somewhat imperfect plate, enlarged 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, Ontario county. 



