542 Edwards—Descriptions of Cyprea and Margineila. 
M. pusilla by the shorter spire, the more depressed apex, and the 
condition of the folds on the columella. It is besides a broader and 
smaller shell. 
Size: Axis, 3-24ths of an inch ; diameter, 2-24ths. 
Loealities: Headon Hill, Lyndhurst, and Roydon in the New 
Forest (Mus. Edw.). 
EXPLANATION OF PLATE XIV. 
Fig. 1. Cyprea cavata (F. HK. Kdw.). 
a. Back view of immature shell from Hunting Bridge. 
6. Front view of do. do. 
c. Back view of adult shell from Bramshaw. 
d. Front view of do. do. 
2. Cyprea orthocheila (F. K. Edw.). 
a. Back view of adult shell from Brook. 
6. Front view of do. do. 
Cyprea attenuata (F'. EH. Edw.). 
a. Back view of adult shell from Bramshaw. 
6. Front view of do. do. 
4, Cyprea alata (F'. Ki. Edw.). 
a. Back view of adult (?) shell from Highgate. 
b. Front view of do. do, 
Cyprea tumescens (F. E. Edw.). 
a. Back view of adult shell from Brook. 
6. Front view of do. do. 
c. Fragment showing the condition of the outer lip and the 
anterior canal. 
6. Cyprea cancellata (F. E. Edw.). 
a. Enlarged view of portion of the whorl, showing the cancellation. 
b. Back view of adult shell from Bramshaw. 
c. Front view of do. do. 
7, Marginella estuarina (F. Ki. Edw.). 
a. Shell natural size, from Roydon. 
b. Enlarged back view. 
ec. Enlarged front view. 
i) 
ox 
IV.—On Certain TRACKS IN THE MANX SLATES.* 
By Tuomas Grinpiey, Esq. 
N 1862 Mr. John E. Taylor (of Norwich), while surveying a 
newly-opened slate quarry at Dalby, on the western side of the Isle 
of Man, discovered three impressions of an oval form about nine 
inches long, and described them t as resembling the tracks of 
Protichnites, figured in Owen’s Paleontology {; the quarrymen told 
him that they were of frequent occurrence. 
In 1863 Mr. Grindley noticed similar markings in great abun- 
dance upon a series of beautifully rippled slates of Cambrian age at 
Laxey, on the eastern side of the island. 
The outline of the markings is an irregular oval. Their dimen- 
sions vary considerably in different examples, the average size being 
* This communication was received some time since, but from want of space we 
have been unwillingly compelled to postpone it, and even now cannot give 1t im 
full.—-Eprr. 
f Geologist, vol. y. 1862, p. 322. + Qnd edition, 1861, p. 183. 
