PLATE XXIII. 
Page. 
Fig. 
1. 
Conularia Iwvigata, J. Morris — Slightly deformed specimen, viewed from 
the 
broad side... 
247 
Fig. 
2 
Conularia lenuistriata, F. McCoy — Specimen, viewed from the broad side 
245 
Fig. 
2a. 
Portion of Ihe narrow side ... 
245 
Fig. 
2b. 
Transverse section of the same 
245 
Fig. 
3. 
Conularia quaJrisulcafa, Miller — Slightly deformed specimen, seen from 
the 
plane of one of the angles 
24G 
Fig. 
3a. 
Enlargement of the surface ornamentation 
246 
Fig. 
4. 
Denialium cornu, L. G. do Kouinck — Specimen, seen in profile 
249 
Fig. 
5. 
Flati/ceras altum, J. D. Dana — Specimen, seen in profile 
251 
Fig. 
0. 
Flafyceras tenella, J. D. Dana — Specimen, seen in profile 
252 
Fig. 
7. 
Platyceras angustiim, J. Phillips — Specimen, viewed from the dorsal side 
250 
Fig. 
7a. 
The same, seen in profile 
250 
Fig. 
8. 
Porcellia JVoodwardii, AF. Martin — Young individual, seen in profile... 
252 
Fig. 
0. 
Pleurotomaria gemmulifera, J. Phillips — Y'oung individual, seen from above ... 
256 
Fig. 
9a. 
The same, enlarged ... 
256 
Fig. 
10. 
Pleurotomaria nalico'ides, L. G. de Koninck — Specimen, seen from above 
258 
Fig. 
11. 
Pleurotomaria striata, .1. Sowerby — Portion of a specimen, seen from above, 
drawn from a gutta-percha impression ... 
255 
Fig. 
12. 
Pleurotomaria 3Iorrisiana, F. McCoy — Specimen, seen in profile, natural 
size 
254 
Fig. 
12ff. 
Portion of the same, enlarged 
254 
Fig. 
13. 
Pleurotomaria Jielicincefjrniis, L. G. de Ivouinck — Specimen, seen in profile ... 
258 
Fig. 
13«. 
The same, enlarged ... 
258 
Fig. 
1-1. 
Pleurotomaria humilis, L. G. de Koninck — Portion, seen in profile, slig 
itly 
enlarged 
257 
Fig. 
14«. 
The same, natural size 
257 
Fig. 
15. 
Pleurotomaria subcancellata, J. Morris — Copied from J. Morris’ figure. 
the 
specimen at my disposal was too imperfect for figuring 
254 
[Fig 
15. 
BTurcliisonia Verneuilliana, Ij. G. de Koninck — Figure 15 between Fig 
23 
and Fig. 7, AV.S.D.] ^ 
260 
Pi O'. 
a. 
10. 
Macroclieilus Jilosus, J. 1). Sowerby — Specimen, seen in profile 
264 
Fig. 
lOff. 
The same, enlarged ... 
264 
Fig. 
17. 
Euomphaliis minimus, .F. McCoy — Specimen, seen from above, natural size 
262 
Fig. 
17a. 
The same, enlarged ... 
262 
Fig. 
18. 
Euompbalus ociilus, J . D. Sowevhy 
261 
Fig. 
18a. 
A young specimen, seen from above 
261 
Fig. 
18i. 
The same, seen from below 
261 
Fig. 
IS^-. 
An adult specimen, showing the aperture 
261 
Fig. 
19. 
Euomphalus catillus, AY. Martin — Impression of the upper portion ... 
263 
Fig. 
20. 
Lo.vonema const ricta, AY. Martin — Young individual, seen in profile ... 
266 
Fig. 
21. 
Loxonema rugifera, .1. Phillips — Portion of a young individual, seen in profile 
268 
Fig. 
22. 
Loxonema acut issima, L. G. de Koninck — Sj)ecimen, seen in profile ... 
267 
Fig. 
23. 
Loxonema dijjicilis, L. G. de Koninck — Portion, seen in profile 
265 
Fig. 24. 
Macroclieilus acutus, J. Sowerby — Young individual, seen in profile ... 
264 
Fig. 
21a. 
The same, seen in profile ... 
... 
264 
