PLATE YIII. 



GyROCEEAS PR^CLARUM, WJiidhome. (Page 91.) 

 Fig. 



1. Almost perfect specimen, wanting the outer layer o£ shell and having two 



specimens of Davidsonia Verneuilii, Bouchard, attached to the body-whorl ; 

 1 a, front view. Wolborough. Vicary Collection. 



2. Almost perfect specimen of a younger shell, retaining the external ornament 



and showing the nucleus ; 2 a, front view (with another fossil projecting 

 from it). Wolborough. Museum of Practical Geology. 



3. Side view of Phillips' original specimen of C ornatum, Phil, (not Goldf.), 



showing the character of the nodes surmounted by the external surface- 

 marks, which are slightly worn. It will be seen by comparison with fig. 2 

 that its ornamentation has become much more rugged with age but not 

 nearly to the extent represented in Phillips' figure. Wolborough. Museum 

 of Practical Geology. 



Gyroceras asymmetricum, n. sp. (Page 93.) 



4. Side view of a portion of a whorl, showing the great asymmetry, the rounded 



ornamentation, and the absence of the longitudinal ridge on the elbow of 

 the shell ; 4 a, front view of the same shell showing the great obliquity of 

 the transverse ridges. Wolborough. Vicary Collection. 



