MADEIRAN GROUP. 217 



the power to do this, the universally acknowledged law of 

 priority being unbending in its operation. 



The P. deformis ( = P. Wollastoni, Lowe) was described 

 from a unique example which was obtained by the Baron 

 Paiva from the north of Madeira (he believes from the Eibeira 

 do Inferno), and which was detected by myself amongst a large 

 batch of the P. Loweana and vincta which he had transmitted 

 to me for examination. At first sight it might almost be re- 

 garded as a mis-shapen, or irregularly developed, monstrosity of 

 the P. Loweana ; nevertheless if it be a truly normal represen- 

 tative of its kind (concerning which I cannot but have some 

 misgivings), it is thoroughly distinct from everything else which 

 has hitherto been brought to light. Thus its short, thick, 

 squarish, barrel-shaped form, and solid, rather coarsely striate 

 surface, added to the unnaturally abrupt (and somewhat oblique) 

 contraction of the spire beyond the second or third volutions 

 (where it forms an obtuse, decorticated umbo), which latter rise 

 up, each of them, into 'a blunt keel or ridge behind the deeply 

 impressed subcanaliculated suture,' give it a character essen- 

 tially its own. Still, I think that further material is absolutely 

 necessary before it will be quite safe to regard the species (from 

 the unique and curiously developed specimen which has been 

 taken as the type) as correctly defined. 1 



Pupa Loweana, n. sp. 



P. oblongo-ovata, sat dense striatula, subnitens, obscure 

 fusco-umbrina (saepius versus apicem plus minus albido-decorti- 

 cata), interdum obscure fasciata ; anfractibus convexiusculis, 

 sutura impressa ; apertura auriformi, ringente, angulis rotun- 

 datis, 5-plicata, sc. plicis 2 (exteriore majore) ventralibus, 2 

 (inferiore majore) columellaribus, et 1 palatali, ventrali exteriore 

 columellarique inferiore magnis subeequalibus, columellari supe- 

 riore palatalique minoribus immersis subinconspicuis ; labro 

 subincrassato reflexiusculo, denticulo ad sinum . distincto intus 

 prominulo, sinu {i.e. inter angulum plicamque ventralem) 

 sphinctere crasso corneo cincto. — Long. lin. 1-|— 2. 



Var. /3. transiens. — Vix minor, subfortius subremotiusque 

 striata; testa plerumque subpallidior ac paulo minus solida 

 (interdum etiam subpellucida, conspicue pallidula), necnon evi- 



1 In the ' Zoological Eecorcl ' for 1867 the P. deformis (i.e. P. Wollastoni, 

 Lowe) is assumed (vide p. 574) to belong to the group Alvearella ; but this 

 certainly is not the case,— Lowe's Alvearella having been expressly established 

 to contain the strongly costate little forms which he described under the 

 names abbreviata and e/ibba. Its affinities are unquestionably with the P. 

 Zowea>ta,Wo\l., and the irrigua,— both of which fall into the section Liostyla, 

 Lowe (which, however, is perhaps hardly separable from Charadrobia, Albers). 



