APPENDIX. 321 
Natrea Surruir, Brown. 
Bursus Smirui. Brown. Mem. Wern. Soe., vol. viii, p. 104, pl. 1, fig. 18, 1838. 
Natica — Forbes. Mem. Geol. Surv., vol. i, p. 430. 
“The only specimen ever met with of this most interesting shell, a member of the division of 
ampullariform Naticee, was found by the Duchess of Argyle in the Pleistocene Beds at Ardincaple. That 
specimen was presented to Mr. Smith, and was figured and described by Captain Brown, in the eighth 
volume of the ‘ Wernerian Transactions.’ It has since, unfortunately, been destroyed. From its delicacy 
it is not likely to occur in the more disturbed beds of the Drift, but should be looked for in the Clyde Beds. 
It is extremely probable that when an opportunity for comparison may occur, the Bulbus Smithii will be 
found to be identical with Natica flava, of Gould; a rare living inhabitant of the Newfoundland Bank.” 
—Forbes. 
Mr. Smith, of Jordan Hill, to whom I have applied in the hope of being able to add something to the 
above remark, expresses his deep regret at the loss of the specimen referred to, which, he says, is the only 
one he has either seen or heard of. 
Natica Bowerspanku, Forbes. MSS. Mem. Geol. Survey, vol. i, p. 430. 
“In Mr. Bowerbank’s Bridlington Collection there is an imperfect specimen of a very distinct species 
of Natica, which does not agree with any living or fossil species known to me. It has a smooth, ventricose 
body whorl, angulated above, and a depressed spire. It equals Nat. monilifera in size.’’—Forbes. 
This is another, at present uncertain, species upon which, I regret to say, my endeavours to add a little 
information have not been crowned with success. Mr. Leckenby, who is well acquainted with the 
Bridlington fossils, kindly undertook to make inquiry for another specimen, but was equally unsuccessful. 
The shell in Mr. Bowerbank’s Museum is in that condition from which a determination would not be at all 
satisfactory. 
Nattca AtpERI, Forbes. 
(Narrtca nrt1pDA, Donovan.) 
This is said to have been found in the Drift Beds of Ireland and Scotland. 
TROCHUS CRENULARIS. Crag Moll., vol. i, p. 123, t. 13, fig. 7. 
The specimen figured under this name at the above reference, I am now inclined to believe is a 
foreigner, and that the species does not belong to the Coralline Crag. 
Trocuus MAGus, Linn. 
Found in the Irish Drift Beds. 2 
Mareanrita unputata, G. B. Sowerby. 
Trocius INFLATUS. Smith. Mem. Wern. Soc., vol. viii, pl. 1, figs. 10, 11. 
Found in the Irish Drift and in the Clyde Beds. 
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