18 TESTACEA ATLANTIC A. 



adult) less strongly striate, but likewise more solid and of an 

 obscurer surface, being free (according to Drouet) from darker 

 radiating transverse lines. 



By Mr. Grodman the H. volutella was met with in the island 

 of Fayal. 



Hyalina miguelina. 



Helix miguelina, Pfeiff., Proc. Zool. Soc. Lond. 33 (1856) 

 Vidaliana, M orel. et Drouet, Journ. de Conch, vi. 148 



(1857) 

 Zonites Vidalianus, Mouss., Viert. der Nat. Zurich, 164 



(1858) 

 Helix miguelina, Pfeiff., Mon. Hel iv. 78 (1859) 



Morel., Hist. Nat. des Acor. 164. t. 2. f. 6 



(1860) 

 Zonites Miguelinus, Drouet, Faun. Acor. 147 (1861) 



Habitat Sta. Maria, S. Miguel, et Terceira ; sub lapidibus in 

 umbrosis, vulgaris. In Sta. Maria necnon semifossilis invenitur. 



Judging from the diagnosis and figure, this Hyalina (which 

 occurs abundantly in Sta. Maria, S. Miguel, and Terceira) 

 seems, in its discoidal contour and widened ultimate whorl, to 

 have much the prima facie aspect of the H. cellaria, or, 

 perhaps, still more, of the Canarian H. lenis and the imme- 

 diately allied forms ; but it is apparently a little larger with a 

 very much smaller umbilicus, and faintly striped transversely 

 (or radiated) with obscure and irregular (sometimes obsolete) 

 fulvescent lines. According to Morelet and Drouet the speci- 

 mens from S. Miguel are generally thinner, more brilliant, and 

 more largely developed, than the others ; whilst those from 

 Sta. Maria (in which island it is found also subfossilized) 

 are not only smaller, more solid, less shining, and more dis- 

 tinctly striate, but have their last volution rather less dilated ; 

 and those from Terceira are a trifle more convex and less 

 narrowly umbilicate. 



Mr. Tristram, in alluding to this shell, in his account of the 

 Pulmonifera which had been met with at the Azores by Mr. 

 Grodman, 1 speaks of it as being (like the H. atlantica) ' im- 

 perforate ' ; but there can be no doubt that in this respect he 

 was mistaken, for it is expressly defined by Morelet as 

 'anguste umbilicata ' (Drouet even calling it ' ombiliquee ') ; 



1 I regret that I am not able to cite Mr. Godman's work amongst my 

 references to the Azorean Gastropods ; but as no absolute list is given of the 

 species which he obtained (the chapter by Mr. Tristram containing merely 

 observations on the general catalogue of MM. Morelet and Drouet), it is 

 scarcely possible to allude formally to the volume amongst the absolute 

 synonyms. 



