316 TROCHIDiE. 



Habitat : Bundoran, in Donegal Bay, where it was 

 first found by Mr. Waller. As yet only about a dozen 

 specimens have been met with. Searles Wood dis- 

 covered this characteristic and interesting species in the 

 Coralline Crag at Gedgrave and Sutton; and Philippi 

 recorded a single specimen from clay at Cefali near 

 Catania. Requien briefly described it as recent from 

 Ajaccio, on the authority of M. Brice and Professor 

 Duminy ; Weinkauff has enumerated it as an Algerian 

 species ; and M. Honor e Martin procured a few speci- 

 mens from the Gulf of Lyons. The kindness of this last- 

 named excellent conchologist has enabled me to describe 

 the operculum. 



It differs from the fry of T. umbilicatus (which also 

 inhabits Donegal Bay) in being equally convex on both 

 sides, the whorls being cylindrical and never angulated 

 as in that species, having twice as many and much finer 

 spiral ridges, the periphery being rounded and not 

 keeled, the suture not so deeply channelled, and in its 

 remarkably wide and open umbilicus. The two species 

 cannot well be confounded. Being anxious to confirm 

 and extend the discovery of my friend, Mr. Waller, I 

 made a purpose-journey to Bundoran, a few years ago 

 when I was last in Ireland, in the hope of procuring more 

 specimens of this rare shell. I had but a single day, 

 which turned out to be about the worst ever known in 

 that rainy climate ; but by leaving Enniskillen at four 

 in the morning, I got two or three hours at Bundoran, 

 and attained my object. Should you see any one acting 

 in a manner apparently so eccentric, do not straightway 

 set him down as out of his senses, but suppose that he 

 may be devoted to an uncommon pursuit. Perhaps 

 your ideas with regard to his conduct may even be 

 more charitable if you consider that such pursuits ad- 



