CAPE-VERDE GROUP. 513 



Habitat S. Antao ; a clariss. H. Dohrn detecta, necoon 

 mihi benigne communicata. 



The extremely minute size and linear outline of this little 

 Pupa, added to its remarkably convex or tumid volutions 

 (which are coarsely and very obliquely striated), its thin sub- 

 stance, its pale whitish-brown, or almost brownish- white,, hue 

 and but slightly shining surface, and its perfectly edentate 

 aperture, will prevent it from being confounded with any other 

 member of the genus from at all events the Cape- Verde archi- 

 pelago. It possesses however a peculiar interest geographically 

 from its being so nearly allied to a subfossil species (the P. 

 linearis, Lowe) from Madeira, which has not yet been met 

 with in a recent state, that before I had made a very close com- 

 parison I thought it most probable that the two would prove to 

 be identical. However, although so intimately related, I feel 

 sure, after an accurate examination, that they must be treated 

 practically as distinct ; for not only is the P. molecula, on the 

 average, a trifle larger and broader than the linearis, but its 

 volutions are perhaps even still more tumid, its suture is more 

 oblique, or less horizontal, and (which is the most important of 

 all) its aperture is appreciably larger and more developed. 



How far the Canarian P. atomus, Shuttl. (which was found 

 by Blauner in TenerifTe), is akin to the P. molecula from the 

 Cape Verdes and to the P. linearis from Madeira I have no 

 means of pronouncing, since I have not been able to procure a 

 type of that species for inspection ; but as it is stated to have 

 much in common with the European P. minutissima, Hartm., 

 it is far from impossible that it may prove eventually to be 

 identical either with its Madeiran or its Cape- Verde ally. 



The discovery of the P. molecula is due to the careful re- 

 searches of Dr. H. Dohrn, by whom it was detected in S. Antao ; 

 and I am indebted to him for types, procured in that island 



( Gastrodon, Lowe.) 



Pupa Dohrni. 



Pupa Milleri, Dohrn [nee Pfeiff., 1867], Mal.Blatt. xvi. 11 



(1869) 

 et anconostoma, Morel., Journ. de Conch, xiii. 



242(1873) 



Dohrni, Pfei/., Mon. Hel. viii. 371 (1877) 

 Habitat (status normalis) S. Antao, et (var. a. perdubia) 

 S. Nicolao. Invenerunt cl. H. Dohrn et R. T. Lowe. 



I should have had but little hesitation in regarding this 

 Pupa as a local phasis (and by no means an important one) of 

 the P. umbilicata, Drap., corresponding with (and indeed only 



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