516 TEST ACE A ATLANTICA. 



Mr. E. L. Layard, now many years ago, in S. Vicente ; and I 

 have myself met with it in that same island, as well as in 

 S. Antao and Fogo ; and examples from S. Autao have been 

 communicated by Dr. H. Dohrn, who likewise obtained it (as 

 implied by his remarks) in S. Vicente, S. Nicolao, and S. lago. 

 I have generally found it under the dead, loosened bark of the 

 old Euphorbias (as was eminently the case at the Monte Nucho 

 in Fogo), and the consequence is that it is often so coated with 

 viscous matter and dirt that it becomes an extremely difficult 

 task to clean it thoroughly for examination. 



The P. acarus is a well characterized little species, and one 

 which may be recognized not only by its minute size, rather 

 thin, subpellucid substance, very pale brown hue, and slightly 

 shining, almost unstriated surface, but likewise by its ovate (or 

 anteriorly gradually tapering) outline, by its somewhat few but 

 relatively large and tumid whorls, and by its rounded aperture, 

 which has the peristome broad and subrecurved, though inter- 

 rupted across the body-volution. Its plaits, which are five in 

 number, are very peculiar, — the inner ventral one being absent 

 (or sometimes just represented by an extremely minute and 

 scarcely perceptible, very deeply immersed rounded tubercle), 

 whilst the outer one is developed into a large and thick inter- 

 naWj-subemarginated process (more deeply immersed in its 

 position than is usually the case, and, although not quite 

 medial, considerably removed from the angle of the lip) ; then 

 there is a large and incrassated one on the top of the columella, 

 and three (remote, and widely separated) on the palate, — of 

 which the middle one is tolerably elongate and conspicuous, 

 and the upper and lower ones short and tuber culiform. 



Pupa gorgonica. 



Pupa gorgonica, Dohrn, Mai. Bldtt. xvi. 12 (1869) 

 „ „ Morel., Journ. de Conch, xiii. 242 (1873) 



Pfeiff., Mon. Hel. viii. 397 (1877) 



Habitat S. Antao, S. Vicente, S. Nicolao, S. Jago, Fogo, et 

 Brava. In S. Nicolao statum majorem ( = 'var. a. subalutacea, 

 mihi) monstrat. 



This very distinct and interesting Pupa will probably be 

 found to be universal (or nearly so) throughout the Cape-Verde 

 archipelago. At any rate I have myself taken it in S. Vicente, 

 Fogo, and Brava ; and it was met with by Dr. H. Dohrn in S. 

 Antao, S. Nicolao, and S. lago. 



The P. gorgonica may be known by its rather short and 

 broad, obtuse, cylindrical-oval form ; by its tumid and very 

 obliquely, but obsolHely, striated volutions ; and by its surface 



