198 TEST ACE A ATLANTIC A. 



separate species and had enunciated it accordingly ! The 

 consequence of which is, that the H. Moniziana figures in his 

 monograph both as a distinct species and as a variety of the 

 H. coronula! 



As regards the shell, however, from the Great Deserta, with 

 which alone we are now concerned, I may add that it is, on the 

 average, larger than the subfossil H. coronula of the southern 

 island (indeed it is the largest, with the exception of the com- 

 paratively gigantic H. delphinuloides, of the six representatives 

 of the Corona,ria-group which have hitherto been brought to 

 light), with its spire very much more conical (or less flattened), 

 and its umbilicus even wider still (or more open). Moreover it 

 has from 7 to 7^ whorls (instead of only from 5 to 6) ; the 

 anterior zone of each volution (which is embossed by the 

 coarse, broad, abbreviated, radiating, transverse, whitish ribs) is 

 more tilted, as in the H. tiarella, or very much less horizontal ; 

 and its true keel (below the extra, medial one, formed by the 

 abrupt termination of the wide ridge-like prominences), which 

 is traceable up the spire and well-nigh overlaps the suture, is 

 conspicuously less lacerated or dentate. 



Feeling confident that it cannot properly be assigned to the 

 subfossilized H. coronula of the Bugio, any more than it can to 

 the H. tiarella or the H. Moniziana (both of which are recent, 

 and occur in Madeira proper), I have had much pleasure in 

 dedicating the Great-Desertan shell to my friend Dr. Grabham 

 of Funchal, whose well-known attainments in so many 

 branches of physical science have rendered his name a house- 

 hold word amongst the numerous class of visitors who have 

 formed, at intervals, a temporary home, during the past fifteen 

 or sixteen years, in the central island of the Group. 



Helix Moniziana. 



Helix coronula [recens], Lowe, Ann. Nat. Hist. (August) 



(1862) 

 a. minor, Paiva, Mon. Moll. Mad. 64 



(1867) 

 Moniziana, Id., L c. 64. t. 2. f, 1 (1867) 



Habitat Maderam ; prope Canipo et Gaula, ad orientem 

 insulse, A.D. 1862, parcissime detecta. 



This is a species which was found in the vicinity of Gaula 

 and Canipo, in the south-east of Madeira proper, by a collector 

 who was employed by the Baron Paiva, in 1862, and which was 

 referred to by Mr. Lowe, in the ' Ann. of Nat. Hist.' for August 

 of that same year, as a recent state of the Southern-Desertan 

 (subfossilized) H. coromda. In this, however, Mr, Lowe was 



