462 TEST ACE A ATLANTIC A. 



Not having recognized them at the time to be conspecific with 

 Hit- P. granumj Mr. Lowe proposed for them the MS. name of 

 buli mil form is ; but a recent comparison of the whole with 

 types of the P. granum, from Switzerland, has completely 

 satisfied me that they cannot be regarded as distinct from that 

 species ; and I may add that such was also the opinion of 

 Mousson, to whom I forwarded the entire series at the time 

 when lie was compiling his late Monograph of the Canarian 

 Land-Mollusca. The only difference that I can detect between 

 the Atlautic specimens and those from more northern latitudes 

 is that the former are a trifle smaller, and that some of them 

 (namely those from Lanzarote and Fuerceventura) are not quite 

 so coarsely striated ; but since the striae of the Grand-Canarian 

 ones appear to be as distinct as in those (now before me) from 

 Switzerland, there seems nothing whatever in the representatives 

 from the islands on which to erect an additional species. 

 Nevertheless their slightly smaller size, and for the most part 

 not quite so strongly sculptured volutions may perhaps just 

 suffice for a ' var. /3. bulimceformis ' to be recognized. 



The P. granum may be known by its rather tapering, elon- 

 gate form (for a shell not exceeding two lines in length), by its 

 somewhat thin substance and pale-brown hue, as well as by the 

 closely-set and very oblique strise of its numerous and exceed- 

 ingly convex volutions. Its aperture is suboval, with the den- 

 ticle of the lip (which is itself regularly rounded, and not 

 sinuate) altogether absent ; whilst its plaits, which are seven 

 in number, and all of them very deeply immersed, are rather 

 peculiarly placed, — there being only a single ventral one (and 

 that medial), two (small and dentiform) on the columella, of 

 which the upper one is the larger, and four on the palate (of 

 which the two outer ones are usually short and rudimentary, 

 sometimes nearly obsolete, and the inner ones more conspicu- 

 ously developed). 



(§ Liostyla, Lowe.) 



Pupa castanea. 



T. inflate ovata, latiuscula, ventricosa, nitidiuscula, distincte 

 inaequaliter striata, obscure rufo-castanea sed basi dilute flaves- 

 cens ; spira obtusa ; anfractibus 6, convexis, sutura profunde 

 impressa; apertura late auriformi, 4-plicata, — sc. 2 (exteriore 

 magna, lamelliformi, valde obliqua, rariss. cum angulo labri 

 sphinctere juncta, sed interiore minore immersa) ventralibus, 

 1 (elongata et valde obliqua) columellari, et 1 (media, filiformi, 

 interna) palatali ; peristomate late expanso, crasso, sordide 

 carneo-albido, marginibus latissime remotis, dextro superne 

 exstanti, sinuato, intus obtuse tuberculiformi, sinum (una cum 



