420 TEST ACE A ATLANTIC A. 



known as the Risco, and overlooking the Salinas, in the extreme 

 north of that island. Its habit of covering itself over with a 

 hardened envelope of earth is even more pronounced than in 

 any of the following forms (being quite as remarkable as in the 

 B. Guerreanus, Grasset, from Hierro) ; but when denuded of 

 this strongly-cemented encasement, the shell will be seen to be 

 somewhat more thin and sub translucent than in the normal 

 state from Teneriffe and Grand Canary, as well as of a deeper 

 and richer coffee-brown and usually altogether unornamented 

 with even a trace of paler markings. Its volutions, too, are 

 remarkably tumid or convex, and the suture consequently much 

 impressed ; its spire is not quite so acutely pointed towards the 

 apex; its aperture (which is a trifle more rounded) has the 

 peristome not quite so thickened or so decidedly expanded out- 

 wards ; and its stature is appreciably larger. 



In its normal condition, under which circumstances it is 

 seldom free from markings (there being generally more or less 

 evident indications of obscure and irregular paler dashes and 

 fragmentary oblique stripes), and in which the size is, on the 

 avei-age, smaller, the B. variatus was found by Mr. Lowe and 

 myself, on walls and rocks, at comparatively low elevations 

 around Garachico and the Puerto of Orotava, in the north of 

 Teneriffe ; and some specimens are now before me, both in a 

 recent and subfossil state, which were taken by Mr. Watson at 

 Tafira in Grand Canary. The ' B. subgracilior ' I met with in 

 the Barranco above Sta. Cruz, in the island of Palma. 



The B. variatus is said by Morelet and Drouet to occvu' in 

 Sta. Maria at the Azores ; but as I have not been able to pro- 

 cure an Azorean type for comparison, I am unable to state whe- 

 ther the phasis which the s^Decies assumes in that archipelago 

 differs in any material respect from what I have regarded as the 

 normal one at the Canaries. Judging from Morelet's diagnosis, 

 the differences do not appear to be very considerable. 



Bulimus myosotis. 



T. [ssepe indumento lutoso dense vestita] rimata, subgracilis, 

 elongato-conica, solidiuscula, subopaca, parum distincte irregu- 

 lariter striatula, pallide flavo-brunnea, concolor (nullo inodo, 

 aut potius rarissime, subvariegata) ; spira acutiuscula ; anfracti- 

 bus 7, convexiusculis, ultimo elongatulo sedvix inflate, et etiam 

 intermediis baud valde abbreviatis ; apertura elongatula, subob- 

 liqua, peristomate acutiusculo, albo, late expanse, reflexiusculo, 

 intus calloso-incrassato, marginibus ssepius lamina tenuissima 

 (ad insertionem dextram plerumque albo-nodulosam) junctis, 

 columellari rectiusculo. — Long. lin. 6 ; diam. maj. 2. 



