APPENDIX. 321 



Natica Smitiiii, Brown. 



Bulbus Smitiiii. Brown. Mem. Wcrn. Soc, vol. viii, p. 104, pi. 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 Naticse, 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 Bowerbankii, 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. 



Natica Alderi, Forbes. 



(Natica nitida, 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. 



Trochus magus, Linn. 



Found in the Irish Drift Beds. 



Margarita undulata, G. B. Soiverby. 



Trochus inflatus. Smith. Mem. Wern. Soc, vol. viii, pi. 1, figs. 10, 11. 



Found in the Irish Drift and in the Clyde Beds. 



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