PLEURODISCIDAE. 181 



Maltese shells I have seen do not seem to differ from Sicilian 

 ialmei. 



Pleurodiscus sudensis (Pfr.). PI. 25, fig. 14. 



Shell umbilicate, depressed, regularly and closely costulate, 

 thin, diaphanous, reddish-corneous; spire slightly elevated; 

 whorls 6, convex, the last not descending; umbilicus rather 

 large, perspective; aperture rotund-lunate; peristome simple, 

 acute, columellar margin slightly dilated, shortly spreading. 

 Alt. 7, diam. 13x11.5 mm. (Pfr.). 



Crete : Suda, type loc, ; Candia ; Akrotini ; all in the north- 

 west part of the island. 



Helix sudensis Pfeiffer, 1846, Symbolae Hist. Hel. Ill, p. 

 103. — RossMAESSLER, Icouogr. L. u. Siisswasser Moll. Eur. Ill, 

 p. 85, f. 901. 



The color is *' pinkish-buff", a little browner than P. balmei. 

 The umbilicus is contained 4j^ times in the diameter. Apical 

 whorls as in P. halmei. The shell is larger than talmei, with 

 about half a whorl less. The last whorl is relatively a little 

 wider and less depressed, the basal margin of the peristome a 

 little more deeply arcuate. The riblets are slightly closer; 

 finally, the white callous lining of the last whorl occupies 

 more space than in halmei, about one-sixth of the base. A 

 specimen from Akrotini figured measures : height 8 mm., diam. 

 13.5 mm. ; 5}^ whorls. 



P. SUDENSIS CYPRiA (Kob.). PI. 25, figs. 17. 



"Differs from the type by the slightly larger shell, more 

 widely umbilicate, more depressed, lightly flattened below, 

 aperture ovate, the lower margin of the lip straightened. 

 Diam. 15 mm., min. 14 mm., alt. 8 mm." {Kobelt). 



Cyprus, in several localities (H. Rolle). 



Patula sudensis var. cypria Kobelt, 1897, Rossmaessler's 

 Iconogr., n. F., Erster Supplement-Band, p. 56, pi. 22, f. 5-7. 



Kobelt further states that this agrees most closely with the 

 Cretan P. sudensis, especially in the size and sharp ribbing, 

 the wide umbilicus and the widening of the last two whorls. 



