166 POIRETIA. 



Bulimus algirus BRUG., Encycl. Meth., p. 364, no. 110, 1792 

 (Algiers). BOURGUIGNAT, Malac. de 1'Algerie, ii, p. 119, pi. 

 7, f. 1-12 (1864). KOBELT, Iconogr., v, p. 55, pi. 134, f. 1314, 

 1316; n. F., xi, pi. m (map of distribution). Achatina boreti 

 GRAY, Ann. of Philos., ix, 1825, p. 414. G. algira var. inter- 

 media Martens, Malak. Bl. fiir 1859, vi, p. 161 ( Sicily) .- 

 Helix poireti FER., Tabl. Syst, 1822, p. 50, no. 358, based on 

 Bruguiere's B. algirus. - - ( ?) Glandina algira var. bonensis 

 ALBERS, Die Hel. 1860, p. 27 (undescribed). Poiretia algira 

 var. pseudoalgira SACCO, I Molluschi dei terreni Terziarii del 

 Piemonte, etc., pt. 22, p. 57, pi. 4, f. 86 (March, 1897). 



"Polyphemus striatus Montfort, Conch. Syst., ii, p. 415," 

 has been cited as a synonym of algira by Raymond, Journ. de 

 Conchyl. iv, p. 15. The name does not occur in Montfort 's 

 work. 



la, Var. DILATATA ('Ziegl.' Pfr.). PL 31, fig. 3. 



The shell is ovate-conic, broader and more inflated than 

 algira, with the spire shorter, aperture much larger. Length 

 36, diam. 14, aperture 20x9 mm., or longer, some Algerian 

 examples as large as 46x20 mm. 



Sicily (type loc.) ; Algeria; southern Italy. 



Achatina dilatata Zgl. mus., PFR., Monogr., ii, p. 289 (1848) ; 

 Conchyl. Cab., p. 306, pi. 17, f. 19-21. Polyphemus tumidus 

 Pfeiff., VILLA, Dispositio Systematica Conch, terr. et fluv. in 

 coll. Villa, p. 19 (1841), nude name. G. algira var. tumida 

 MARTENS et al. 



The name tumida, adopted by some authors, has no stand- 

 ing, since it was not defined until long after Pfeiffer had de- 

 scribed and figured dilatata. A fine series has been figured 

 by Kobelt, Iconographie n. F., iii, p. 1, pt. 61. I copy the 

 type figure. The radula has been figured by Henking 

 (Zoologische Jahrbiicher viii, 1895, p. 88). It has 18,1,18 

 teeth. The animal preyed on Rumina decollata. 



1&. Var. SICULA (Bgt.). 



"A species special .to Sicily, characterized by a very long 

 spire, relatively very short aperture, and especially by the 



