PLATE XXXII A— Continued. 
COLEOLUS ? GRACILIS. 
Page 190. 
Fig. 19. A fragment of an individual, showing the ordinary form and the natural curvature of the shell. 
Hyolithes triliratus. 
Page 201. 
The dorsal side of an imperfect individual, imbedded in the rock, showing a double groove along 
the dorsal angle. 
A large individual, showing a distinct groove along the dorsal angle, with the lateral angles crushed, 
and the shell partially separated. 
Hyolithes aclis. 
Page 197. 
The ventral side of a small individual, which is compressed near the margins, and the sides par¬ 
tially separated at what appear to be, the suture lines (= var. petaloidea). 
The ventral side of a specimen preserved in the coarser shale, and showing longitudinal striae very 
; distinctly near the lower margin. 
The inner surface of the shell on the ventral side, showing the longitudinal and transverse striae, 
and also the longitudinal lines of apparent fracture from compression (= var. petaloidea). 
An enlargement of an operculum, supposed to belong to this species, showing the surface characters 
more in detail than figure 27 of plate 82. 
Hyolithes striatus. 
Page 199. 
Fig. 26. An enlargement of an operculum, supposed to belong to'this species. 
Hyolithes singulus. 
Page 202. 
Fig. 27. The lower part of an individual of this species, showing the character of the surface-markings, and 
obtusely triangular form of the shell. 
Clathroccelia eborica. 
Page 201. 
Fig. 28. The exposed flat side of a specimen, showing the arching and recurved septal mai'kings, with some 
of the longitudinal striae. 
Fig. 29. A larger individual than the preceding, showing the arching, septal markings and the longitudinal 
striae. The shell, in the lower part, is crushed, and appears to be separated in distinct arching 
laminar rings. 
Fig. 21. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 20. 
Fig. 22. 
