436 TEST ACE A ATLANTIC A. 



found by Blauner and Fritsch in the Taganana ravine, as well 

 as by Grrasset on the ' Cumbre ' (the one, I presume, overlooking 

 the Canadas). 



The B. Tarnerianus is rather a large species, of an elongate- 

 ovate outline and with the spire somewhat acute ; and the greater 

 portion of its surface (which is almost opake, and of a pale 

 olivaceo-corneous hue) is coarsely sculptured with oblique pli- 

 cate striae which are more or less broken-up into elongated 

 (though very irregular and unequal) granules. It columella is 

 rather long and sinuate, and generally abruptly terminated be- 

 hind (which causes the aperture to appear a little angulated) ; 

 and the margins of its peristome (which is of a dingy white) 

 are far apart, and for the most part altogether unconnected by 

 an intervening lamina. 



Bulimus tabidus. 



Bulimus tabidus, ShuttL, Bern. Mitth. 143 (1852) 

 „ „ Pfeiff., Mon. Hel. iii. 347 (1853) 



Buliminus tabidus, Mouss., Faun. Mai. des Can. 114. t. 6. 



f. 9 (1872) 

 Bulimus tabidus, Pfeiff., Mon. Hel. viii. 71 (1876) 



Habitat Teneriffam ; juxta Sta. Cruz (sec. cl. Shuttleworth ) 

 parce repertus. An a B. Tarneriano, Grasset, distinctus ? 



This is one of the few Bulimi of which I do not possess an 

 example sufficiently authentic to be relied upon ; but, judging 

 from the diagnosis and figure which are given by Mousson, I 

 should have said that it was absolutely inseparable from the B. 

 Tarnerianus, which is likewise peculiar to Teneriffe. Indeed 

 Shuttleworth's original description of it, in 1852, is, I may add, 

 in precise accordance also with the subsequently-published B. 

 Tarnerianus ; nevertheless, as Mousson expressly states that he 

 had received a type of the tabidus from Shuttleworth himself, 

 and he had an abundance of specimens of the Tarnerianus 

 (many of which I had sent to him) to compare with it, I pre- 

 sume that he must have satisfied himself that the two forms are 

 not absolutely identical. But since both the diagnoses of it to 

 which I have access (namely Shuttleworth's and Mousson's) 

 tally with the B. Tarnerianus, the characters of which have 

 already been pointed out, I need not attempt to sum them up 

 afresh in this place. Suffice it to observe that Shuttleworth 

 makes the following remark concerning his B. tabidus : —' An 

 varietas B. obesati, W. et B. ? ; sed minor, gTacilior, anfr. con- 

 vexioribus, prsesertim sculptura satis differre videtur.' ^ 



' In support of my conjecture that the B. tahidus and Tarnericuius are in 

 reality one and the same sjjecies, I may just add that although Mousson cites 

 the former as having been taken by myself at Taganana, all the Taganana 



