PLATE XXXII A. 



COLEOPRION ? TENUIS. 



Pag« 184. 

 PJjf. 1. A specimen in shale, natural size. 

 tig. 2. A ^H>i-tiun of the same enlarg^ed, stiowinj; the longitudinal grove and oblique sirise. 



COLEOLUS CRENATOCINCTDM. 

 l'«^ 18?. 

 Fig. 3. A 8i>ecimen in which the trAnsvei-se strise or aunulations are barely perceptible. 

 Fig. 4. A piece of limestone preserving portions of' several individnals of this species, which ai* broken 

 longitudinally, showing the inteiior filling and the thickness of the shell. 



,'l.i  ■: i W 1 • : . ii 



CoLEOLUS? MOHRI. 



Pngc 189, , . 



Fig. 5. A fragment of an individual imbedded in limestone, showing, in part, the interior cast with the erysr 



talline shall, and the faintly striated impresmun of the exterior in the lower ]>art of the •pecimon. 



CoLEOLUS TENUICINCTUM. 



Page 18S. 



Fig. 6. A sjiecimen, natural size, which is compressed and longitudinally grooved from fractni-e, at both 



extremities, while the cential portion is morn faintly stnated, and shows no lontritmliiial groove. 

 Fig. 7. An enlarg»>ment of a fragment which is strongly striated at one end with a longitudinal depression j 



the i-emaining portion being faintly striated, ami preserving its natui-al proportions. 

 Fig. 8. Another imlividual, enlarged, .showing the smaller extremity much flattened, strongly striated and 



longitudinally grooved. The central portion is more distinctly striated, without longitudinal 



groove, while the largei- extremity has a sliglit longitudinal groove an<l stronger anniilations. 

 Fig. 9. A fragment enlarged. The annulating strim ai-e regular and shai'ply defined, and the longitudinal 



groove is evidently due to fractni-e. The longitudinal striffi aT-e likewise shown in the specimen. 

 Fig. 10. An imperfect specimen, natural size, showing fine, equal and obliquely-annulating strise. 



H JT/.i.'i'ia Ha JIT J JOY II 

 CoLEOLUS AQfOULCH. 



Page 187. ^,.,^, ., .,„_^_, 



Fig. 11. An indiviiiual, natural size, which i.s flattened upon the surface of a slat}- lamina ; the lower portion 



Khowiug a longitudinal lino of fiiicture, with obscure indications of trausvei-se stria; neaa' the 



aperture. 

 Fig. 12. A siuiila)' specimen to the piecediug, but less distinctly preserved. 

 Fig. 13. A fragment of slate, preserving a crushed specimen of this species, ami a young, or the smaller 



extremity of another indivi<lual. 

 Fig. 14. A small or imi)ei'fect individual of this species from the green shale of the Portage group, in which 



occurred the original of Oiihoceras ac'imilnm. 

 Fig. 1.^1. A fragment of wh.it appears to be the same species, preserving obscure transverse strijE. The 



specimen is pi-e.^erved in a soft olive shale. The transverse sti-iHj in this figure and in tiguie II 



are much too strongly re))resented. 

 Fig. 16. A crushed and imperfect inilivi<iual. apparently of this species. The lower part of the imprint 



kIkiws i>bs<!iire, car.cellaing striae. 



CoLEOLUS (DeNTALIUM ? ) ACICULATUM. 

 Page 190. 

 Fig. 17. A fragment of limestone, preserving poi-tions of two individuals. Natural size. 

 Fig. 18. A part of an imlividual enlarged, showing the cajt of the interior and the thickness of the shell. 



