CAPE-VERDE GROUP. 525 



petite Paludine est evidemment celle dont il est fait mention 

 dans la notice de M. Dohrn, mais que l'auteur a laissee innommee, 

 faute de materiaux suffisants, tout en jugeant qu'elle se rappro- 

 ehait de Y acuta. L'identite, pour moi, ne fait nul doute ; je ne 

 trouve aucune difference entre cette coquille et l'espece de 

 Draparnaud. Au surplus, la presence de VHydrobia acuta dans 

 ces parages ne surprendra pas plus que celle de la Limncea 

 ovata.' 



Fam.8. MELANIIDiE. 

 Genus 17. MELANIA, Lam. 



Melania tuberculata. 



Nerita tuberculata, Hull., Verm. Hist. 191 (1774) 

 Melania Tamsi, Dunker, Ind. Moll. Tarns, (1853) 

 „ „ Dohrn, Mai. Bldtt. xvi. 19 (1869) 



„ tuberculata, Morel., Joum. de Conch, xiii. 240 



(1873) 



Habitat S. Antao, S. Nicolao, et, saltern in statu semifossili, 

 S. Vicente ; in aquis salinis et subsalinis ad ora rivulorum prse- 

 cipue degens. 



Of all tbese Atlantic archipelagos, the Cape Verdes are the 

 only one in which the genus Melania, which is so widely spread 

 along the littoral districts of the African continent, and which I 

 have myself taken abundantly on the western coast of Morocco, 

 has been ascertained to occur, — the present species having been 

 met with in profusion by Dohrn in S. Antao and S. Nicolao, 

 where it lives ' in the lagoon-like expansions near the mouths of 

 the streams.' We may be pretty sure also that it will be found, 

 sooner or later, in most of the other islands : indeed in S. Vi- 

 cente it has already been obtained, by Mr. Lowe and others, in 

 a subfossilized condition (though, singularly enough, at some 

 distance from the sea), — which would assuredly imply that there 

 at any rate (no less, probably, than elsewhere) it needs only to 

 be searched for in the right localities. 



The S. Antao examples of this Melania which were collected 

 by Dohrn are, on the average, rather smaller than those from S. 

 Nicolao, and have their volutions a little more convex, — assimi- 

 lating almost exactly the usual type of Miiller's M. tuberculata ; 

 and the subfossilized examples from S. Vicente may be said to 

 be equally normal in their details. Those however from S. 

 Nicolao (which were met with by Dohrn, more particularly, at 

 the mouth of the Ribeira de Castelhoens, near the eastern point 

 of that island) are chiefly larger and have the whorls not only a 



