504 TEST ACE A ATLANTIC A. 



Helix myristica, Dohm, Mai. Bldtt. xvi. 9 (1869) 



Morel., Journ. de Conch, xiii. 234 (1873) 



Habitat S. lago ; juxta Villa da Praia, et recens et semifos- 

 sUis, nuper re-detexit (sec. Morelet) Dom. de Cessac. 



I have not inspected a type of this Helix, which appears to 

 occur in S. lago, but it must be very near to (if not absolutely 

 identical with) Dohrn's H. Visgeriana which is likewise a S. 

 lago species. Morelet mentions that it has lately been re- 

 detected by M. de Cessac near the Villa da Praia, but (although 

 recent) not in an actually living state ; ' II ne 1'a pas trouvee 

 vivante, mais vide depuis longtemps et entrainee, sans doute, 

 par les eaux fluviales dans les parages de la Praya. II est done 

 presumable qu'elle vit sur quelque points eleve des alentours.' 



Judging also from Morel et's remarks, the H. myristica (at 

 any rate as understood by him) is, in its five or six interrupted 

 fasciae and whitish transverse ribs, wonderfully in accordance 

 with Dohrn's species in which (according to the latter) ' the 

 two central bands have a tendency to split, so that sometimes 

 six and sometimes five fasciae are present, the whole shell being 

 also marked with yellow lines and spots which give it a very 

 variegated appearance.' (Mai. Bldtt. xvi. 6.) 



M. de Cessac seems likewise to have met with this Helix in 

 a subfossilized condition, though under a rather more depressed 

 (and therefore somewhat aberrant) phasis. It was found in a 

 calcareous deposit near the Villa da Praia, and I have cited it 

 in our present catalogue as the ( /?. depressiuscula.' Morelet's 

 observations concerning it are as follows : ' Une variete semi- 

 fossile a ete decouverte par le meme voyageur a la Praya de San 

 Yago, dans un calcaire inferieur a une coulee de basalte, de 12 

 a 14 metres d'epaisseur, qui s'etend sous la ville. Plus deprimee 

 que la forme typique, elle compte un demi-tour de moins a la 

 spire : le dernier est, en meme temps, plus dilate. La colora- 

 tion, assez bien conservee, consiste en zones noiratres sur un 

 fond d'un gris livide ; ces zones, excepte celle de la base, sont a 

 peu pres confondues entre elles, en sorte que la coquille, du cote 

 de la spire, est d'un noir bleuatre uniforme.' (Journ. de Conch. 

 xiii. 234.) 



Helix fogoensis. 



Helix Fogoensis, Dohrn, Mai. Bldtt. xvi. 8 (1869) 



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



Pfeif., Mon. Hel. vii. 326 (1876) 



Habitat Fogo, et Brava ; in illo ad Monte Nucho a meipso, 

 sed in hac in montibus supra Povoaao a Revdo. R. T. Lowe 

 lecta. 



