CAPE- VERDE GROUP. 495 



Patula type than the preceding two, is smaller, darker, and 

 much less keeled than the P. gorgonarum (indeed perhaps a 

 trifle less so than even the so-called ' var. /3. minor ' of that 

 species, and the P. Bouvieri), and it is also a trifle less fragile 

 in substance, its umbilicus is relatively larger and more open, 

 and its spire is a little more compact and apically obtuse, — the 

 volutions not being quite so prominent and convex. When in 

 a young state it is studded all over, though especially about the 

 keel, with minute hairs. 



The P. Bertholdiana is, so far as I am aware, peculiar to 

 S. Antao and S. Vicente, — in which islands it was obtained by 

 Dr. H. Dohrn, and to whom I am indebted (for it was not met 

 with either by Mr. Lowe or myself) for the types which are now 

 before me. 



(§ AeantMnula, Beck.) 



Patula pusilla. 



Helix pusilla, Lovje, Cambr. Phil. S. Trans, iv. 46. t. 5. 

 f. 17 (1831) 

 „ „ Pfeiff., Mon. Hel. i. 101 (1848) 



„ servilis, Shuitl., Bern. Mitth. 140 (1852) 

 „ „ Pfeiff., Mon. Hel. iii. 101 (1853) 



„ pusilla, a. annulata, Lowe, Proc. Zool. Soc. Lond. 



176 (1854) 

 „ „ Alb., Mai. Mad. 18. t. 2. f. 7-10 (1854) 



„ servilis, Morel., Hist. Nat. des Acor. 173. t. 3. f. 6 



(1860) 

 „ hypocrita, Dohrn, Mai. Bldtt. 1 (1869) 

 Patula servilis, Mouss., Faun. Mai. des Can. 25. pi. 2. 



f. 13-16 (1872) 

 Helix hypocrita, Morel., Journ. de Conch, xiii. 242 (1873) 



Habitat S. Antao ; a cl. H. Dohrn parce deprehensa. 



Several examples of a very minute Patula have been com- 

 municated to me by Dohrn as types of his P. hypocrita, and 

 which were taken by himself in S. Antao ; but after a long and 

 rigid inspection of them I can come to no other conclusion than 

 that they are absolutely inseparable from the common Madeiran 

 H. pusilla, Lowe, — a species which occurs also in the Azorean 

 and Canarian archipelagos as well as at St. Helena, and which 

 would seem therefore to possess a somewhat wide geographical 

 range. 



The extremely diminutive size, discoidal contour, and uni- 

 formly brown hue of the P. pusilla, in conjunction with its 

 curious tendency to have a few rather more elevated hair-like 

 lines (in addition to the still finer ones which will be seen 



