192 TESTACEA ATLANTICA. 



tion. Its aperture, which is suddenly and greatly deflected, is 

 most peculiar, — being externally angulated at the keel, and 

 produced into a sharp beak-shaped process, whilst the peristome 

 is much developed and continuous, being considerably raised 

 above (or, rather, as it were, hung down below) the ultimate 

 whorl, with the basal margin conspicuously reflexed. The 

 sculpture of the upper portion of the shell is very much finer 

 and lighter ; but there are evident traces (in the specimens 

 which are better preserved) of minute spiral ridges, crossed by 

 exceedingly indistinct, irregular, and still finer transverse lines, 

 though other examples have a more coarse and malleated ap- 

 pearance. 



The ' var. B. planospira ' is merely a little larger and 

 flatter than the ordinary type (the spire being less elevated), 

 with the umbilicus somewhat more gradually (or less perpen- 

 dicularly) scooped-out, and with the sculjjture on the upper 

 side rather finer. 



(§ Coronaria, Lowe.) 



Helix delphinuloides. 



Helix delphinuloides, Loive, Ann. Nat. Hist. vi. 44. pi. 3. 



f. 1-3 (1860) 

 „ „ PfeW; Mai. Bldtt. xi. 54. t. 2. 



f. '14-16 (1864) 

 „ „ Paiva, Mon. Moll. Mad. 67. t. 1. 



f. 1 (1867) 



Habitat Maderam ; in Ribeira do Fayal, ad alt. circa 4000' 

 s.m., ad terram inter gramina et herbas latitans, a Eevdo. E. T. 

 Lowe, A.D. 1860, copiose reperta. 



This is not only one of the most anomalous of the Madeiran 

 Helices., but by far the most remarkable one which has been 

 brought to light of late years, — it having been discovered, by 

 Mr. Lowe, so recently as in 1860. It was at an elevation of 

 about 4000 feet, in the Eibeira do Fayal, that Mr. Lowe met 

 with it, and moreover in considerable abundance, — ' on the sur- 

 face of the somewhat moist, loose, friable, black vegetable 

 mould, amongst tufts of grasses, ferns, &c., on a steep, dry, 

 sunny bank clothed with shrubs of Vaccinium and Heath, and 

 mixed with a few scattered trees of Lauriis, at the foot of per- 

 pendicular crags, along the new Levada called the Levada da 

 Fajaa dos Vinhaticos.' 



The H. delphinuloides (which measures about 8 lines across 

 its broadest part) is almost exactly intermediate between Mr. 

 Lowe's sections Craspedaria and Goronaria, so that it might 

 with nearly equal propriety be assigned to either of tliem ; yet 

 although its very much larger size than any of the members 



