416 TEST ACE A ATLANTIC A. 



Helix ventrosa, Fer., Prodr. 377. t. 52 (1807) 



Bulimus ventrosus, Loiue, Cambr. Phil. Soc. Trans, iv. 62 



(1831) 

 Helix acuta, W. et B., Ann. des Sc. Nat. 28. syn. 317 (1833) 

 Bulimus ventrosus, Alb., Mai. Mad. 54. t. 14. f. 18, 19 



(1854) 

 „ „ Faiva, Mon. Moll. Mad. 103 (1867) 



Helix ventricosa, Mouss., Faun. Mai. des Can. 46 (1872) 



Habitat Canariam Grandem, et Teneriffam ; sub lapidibus, 

 prsecipue in cultis inferioribus, hinc inde congregans. 



The common Mediterranean B. ventricosus, whicli occurs 

 likewise in the Azorean, Madeiran, and Cape Verde archipelagos, 

 has established itself in Grand Canary and TenerifFe ; but, 

 although probably existing in some of them, it has not yet been 

 observed in any of the other islands. It abounds also at 

 Mogador, on the opposite sandy coast of Morocco. My Grand- 

 Canarian examples are principally from the intermediate region 

 of El Monte ; and some which are now before me were taken by 

 Mr. Watson on the road from Las Palmas to Arucas. 



The truly indigenous Bulimi which occur in the Canarian 

 archipelago are many of them so nearly related inter se, that, 

 whether regarded as genuine species or as mere insular modifi- 

 cations of a few central types ( — a question which can never 

 perhaps be settled satisfactorily), it seems desirable to draw out 

 short diagnoses of them afresh, in order to call attention more 

 readily to the exact points in which their differences respectively 

 consist. Six species, however, out of the 29 enumerated below 

 (namely the B. Maffi^oteanus , Mouss., the indifferens, Mouss., 

 the texturatiis, Mouss. the tabidus, Shuttl., the anaga, Grass., 

 and the servus, Mouss.), I have not been able to procure for 

 inspection ; and concerning these therefore I can add nothing, 

 beyond what may be gathered from their published descriptions. 



Bulimus Guerreanus. 



T. [soepius indumento lutoso dense vestita] minute rimata, 

 breviuscula, conico-ovata, tenuissima, subpellucida, nitidiuscula, 

 insequaliter striatula, pallide olivaceo-cornea ; spira breviter 

 conica ; anfractibus 6, convexis, ultimo rotundato, subinflato ; 

 apertura parum obliqua, peristomate simplici, acuto (nee ex- 

 panso), marginibus ssepius lamina tenuissima (vix perspicua) 

 simplici junctis, dextro rotundate curvato, columellari lireviter 

 reflexo. — Long. lin. 4 ; diam. maj. 2. 



