294 TESTACEA ATLANT1CA. 



Genus 4. AURICULA, Lam. 



4. Auricula sequalis. 



Melampus aequalis, Lowe, Zool. Journ. v. 288. t. 13. f. 1-5 

 (1835) 



Auricula aequalis, Id.,Proc. Zool. Soc. Lond. 217 (1854) 

 Vulcani, Morel., Hist. Nat. des Acor. 207. t. 5. 

 f. 8 (1860) 



Marinula sequalis, Paiva, Mon. Moll. Mad. 151 (1867) 



Auricula Vulcani, Mouss., Faun. Mai. des Can. 135 



(1872) 

 aequalis, Watson, Journ. de Conch. 220 (1876) 



Habitat per oras maritimas insulae Majoris ; ad rupes sestu 

 maris quotidie submersas copiosissime adhserens. 



The particular form which this common Auricula assumes 

 at the Salvages, and which may perhaps be identical with the 

 A. Ferminii, Payr., is slightly different from that which 

 is so abundant in the Madeiran archipelago ; and as I have 

 already characterised it (as the ' var. 7. albescens ') at p. 267 of 

 this volume, I need scarcely do so afresh. Suffice it to observe 

 that the A. cequalis is appreciably paler here than it is at the 

 Madeiras, as well as (relatively) a trifle longer, slenderer, and more 

 opake ; and its surface is, for the most part, a good deal eroded, 

 or eaten-into, much as in the A. Paivana. I have ex- 

 amined a perfect multitude of specimens, which were obtained 

 from the Great Salvage, and I find that these small differen- 

 tial features (however unimportant) are well-nigh invariable ; 

 but as one or two examples which are now before me, and 

 which were communicated by Mr. Watson, appear to be on 

 the ordinary Madeiran type, and a few out of my own assort- 

 ment are likewise connective, I am not able to register the ' var 

 7. albescens ' as the only phasis of the shell which is found on 

 these remote rocks. Still, it is quite evident that it is the prin- 

 cipal one, and that the rather darker and more ventricose form 

 is at the Salvages the rarer of the two. 



The occasional thickening of the outer lip is about as often 

 traceable (however seldom) in the 'var. 7. albescens' as it is 

 in the ordinary type. 



5. Auricula Watsoni. 



Auricula myosotis, Watson [nee Drap.~], Journ. de Conch. 



220 (1876) 

 Watsoni, Woll., vide ante, p. 269 huj. operis. 



Habitat insulam Majorem ; una cum A. cequali commixta, 

 sed multo rarior. 



