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PLATE XXXIL—Cmtinued. 



HyoLITHES ACLI8. 



Page 197. '■• ' ' 



Fi^. 22. The ventral side of a large specimen fiactiired by compression. - >c^g, 



Fig. 23. 'Hie opposite side of the same. 'wB-^ -V '' 



Fig. 24. Profile oulline of the same, showing the convexity. "" 



Fig. 2'). A more expanded and comparatively shorter form. The cavity contains the head of a small Dal- 



MAXITBS. 



Fig. 26. A transverse section of a specimen of this species. 



Figs. 27, 28. Two different forms of opei-culum associated with the above, and supposed to belong to the 



same species. 

 Fig. 29. An enlai-ge<l figure from a specimen of angular form, showing obscure longitudinal striae, and distinct 



suture-like lines. In the lUiutialUms of Dewmian Fossils this figure (as fig. 9 of Plate XXVII) 



is errone(msly referred to H. striatux. 



Htolithes A0LI8, var. petaloidea. 



Page 197. 

 Fig. 30. The ventral side, with the central portion depressed, and limited by a distinct angularity on each 

 side. 



Htolithes striatus. 



Page 199. /'i 



Fig. 31. An enlargement of a specimen to three diametei-s, showing the ventral surface with longitudinal 



strite, and the impi-es.sion of the angular side with charactei-istic impressed lines. 

 Fig. 32. An enlargement of the doi-sal surface to six diameters, showing the longitudinal striae. 

 Fig. 33. A ti-ansverse section of a specimen of this species. 

 Fig. 34. An operculum found associated with the specimens, and supposed, from its form and radiating 



striae, to belong to the species. 



