172 EUROPEAN SPECIES OP VERTIGO. 



Algeria: Oued Tademit, 15 leagues S.-W. of Djelfa, origin- 

 ally found fossil, but later also living in the same valley, in 

 humid places under stones (Mares). Alluvium of the Isser 

 (Letourneux). 



Vertigo maresi BOURGUIGNAT, Paleontologie de 1'Algerie, 

 1862, p. 79, pi. 4, f . 6-8 ; Malac. Alg., ii, 1864, p. 106, 313, pi. 

 6, f. 48-50. HANOTEAU & LETOURNEUX, La Kabylie, i, 1872, 

 p. 228. 



Group of V. substriata. 



Strongly striate or rib-striate, with teeth as in the anti- 

 vertigo group, 1-1-2 to 3-1-2 or 3-1-3. According to Jeffreys 

 the half grown shell has a spiral columellar lamella. 



51. VERTIGO SUBSTRIATA Jeffreys. PI. 17, fig. 10. 



"Shell oval or subfusiform, rather thin, and seniitraus- 

 parent, glossy, pale yellowish-horn-color, very strongly and 

 obliquely striate and almost ribbed in the line of growth, but 

 less so on the body whorl, which is faintly striate spirally, 

 periphery rounded : epidermis rather thick : whorls 4i/>, very 

 convex or cylindrical, and suddenly increasing in bulk, the 

 penultimate whorl slightly exceeding in breadth the last, which 

 occupies about one-half of the shell : spire short, very abrupt 

 and bluntly pointed: suture remarkably deep: mouth semi- 

 oval, contracted or sinuous in the middle of the outer edge; 

 teeth from four to six, viz. from one to three (usually two) 

 on the pillar [parietal wall], one on the pillar lip, and two or 

 three on the inside of the outer lip, the last springing from 

 a white rib ; in half grown specimens the pillar lip has a spiral 

 or longitudinal fold. Outer lip thin and slightly reflected, 

 strengthened [externally] by a strong rib, which is placed 

 very near the opening the mouth ; outer edge abruptly in- 

 flected, inner lip thickened in the adult ; umbilicus small and 

 narrow, contracted by a keel or ridge at the base of the shell. 

 L. 0.065. B. 0.04 inch." (Jeffreys). 



Great Britain, "from Skye to Devon as well as throughout 

 Ireland " (Jeffreys). Scandinavia, Denmark and Germany, 

 south to Switzerland and the Austrian Tyrol ; Caucasus. 



