POIRETIA. 167 



very much arched columella, which is less abruptly truncate ' '- 

 (Bgt., Malac. de 1'Algerie, ii. p. 117, 1864). 



Westerlund considers var. microstoma Kobelt and var. py- 

 ramidata Paulucci synonyms of sicula. A comparison of the 

 types should be made. 



Var. microstoma Kobelt (pi. 31, fig. 1). Columella very 

 strongly concave ; aperture very short, only 16 mm. long in a 

 shell of 42 mm. The truncation of the columella is much less 

 strong than in var. cornea. ( Glandina algira var. microstoma 

 Kobelt, Iconogr.. v, p. 57, p-1. 134, f. 1313, 1877.) 



Grecian forms of the algira-dilatata type. Mousson, von 

 Martens and others have reported dilatata from various in- 

 sular localities in or 'adjacent to Greece. Two names have 

 been based upon examples from that region, delesserti Bgt. 

 and marginata Westerl. The exact relationships of these 

 forms to one another and to Italian dilatata remain to be 

 worked out. 



Ic. Var. MARGINATA ( Westerlund) . 



Suture accompanied by a strongly raised line, smooth and 

 olive-colored above, then white and strongly crenate ( Wester- 

 lund: G. dilatata var. marginata, Fauna Palaarctischen Re- 

 gion Binnenconch., i, p. 10, 1886). 



Crete. 



Id. Var. DELESSERTI ( B our gui gnat). PL 31, figs. 5, 6, 7. 



Shell solid and strong, the last whorl somewhat saccate; 

 embryonic shell (fig. 5) with lower, more convex whorls than 

 in Italian or Sicilian forms of P. algira, forming a larger, 

 more obtuse apex. Columella very concave. 



Length 40, diam. 14.7, aperture 20.5 mm. ; whorls 6%. 



Length 35.3, diam. 13.7, aperture 17 mm. ; whorls 6. 



Greece: Corfu (N. Conemenos). 



Glandina delesserti Bgt. (Testacea Novissima, etc., p. 19, 

 Aug. 1852), from Corfu, has been stated by that author to 

 be identical with compressa, but the measurements (alt. 9, 

 diam. 5, length of aperture 7 mm., whorls 4) do not bear out 



