458 TEST ACE A ATLANTIC A. 



(§ Ferussacia, Eisso.) 



Lovea Eeissi. 



Achatina folliculus, W. et B. [sed vix Gro7i? ; 1871], Ann. 



des So. Nat. 29. syn. 320 (1833) 

 Cionella Eeissi, Mouss., Faun. Mai. des Can. 129. pi. 6. f. 



26, 27 (1872) 

 P'erussacia Eeissi, Pfeiff., Mon. Hel. viii. 303 (1876) 



Habitat Teneriffam ; a DD. Eeiss et Watson parce ablata. 



Three examples of a shell which were obtained by Mr. Wat- 

 son in Teneriffe are clearly referable to the Lovea which is de- 

 scribed by Mousson under the name of ' Cionella JR.eissi,'' though 

 I am extremely doubtful whether they represent more in reality 

 than a very slightly altered geographical phasis of the L. 

 follicidus, — with which indeed the species was actually iden- 

 tified by Webb and Berthelot. Mousson, however, believes it 

 to be still more nearly allied to the Vescoi, Boiu'g. (Maltese 

 specimens of wbidrBre now before me, and which appear to me 

 to be only just distinguishable from the Teneriffan ones), 

 adding ' la forme totale est une idee moins allongee ; le dernier 

 tour est plus arrondi, sans tendance a devenir plan au milieu ; 

 le bord droit s'eloigne plus sensiblement da la parol aperturale ; 

 I'ouverture par la devient plus largement ovale ; I'expansion 

 calleuse du bord columellaire est un pen plus grande ; le test 

 est bien plus transparent, bien que corne ; la margination 

 blanchatre de la suture est plus large et souvent accompagnee 

 d'une ligne brune, qui toutefois parait moins resider dans la 

 substance du test que dans Tangle aigu qui relie les tours. 

 Toutes ces differences sont faibles et pourraient peut-etre se 

 concilier avec I'idee d'une variete geographique.' 



Judging from the three examples to which I have access, 

 the L. Reissi is a trifle larger and more robust than the 

 follicidus (the largest one being 5 lines in length, instead of 

 only about four), and the outline of the shell on the ^e/i-hand 

 side is a little more bi-arcuated, — owing to the penultimate 

 and antepenultimate whorls (the latter of which perhaps is 

 somewhat longer) being respectively more convex. Its suture 

 is very oblique ; and its columella is a little broader, and more 

 concave and flexuose, as well as more abruptly terminated 

 behind, than in at all events the Madeiran specimens of the 

 folliculus, — in which the columella is perceptibly narrower and 

 less developed. However, since each of the three individuals 

 differ slightly in this particular respect, I cannot attach any 

 value to it as a true specific character. 



My own belief is that the L. folliculus^ Vescoi, and Reissi 



