1923.] ly. Gkrmain : Catalogue of Planorbidae. 187 



largemeiit. atteiiiu' en dessous ; ouvertnre aussi haute que large, 

 irregulierement ovalaiie, un pen anguleuse en bas, subanguleuse 

 exterieurement. 



Diamctre niaxiinuni : 2i| millimetres, hauteur maximum: 

 195- millimetres; hauteur de I'ouverture : 14 millimetres; diame- 

 tre de I'ouverture : 14 millimetres.' 



Test solide. assez epais. 



Ce Pompholyx dilTere du Poniphuly.x effiiui Lea par ses pre- 

 miers tours de spire plus eleves, proem.inents* ; par sou dernier 

 tour proportionnellemeut moins elargi et par son test beaucou]i 

 plus epais et solide. 



" The specimens in question," ajoute W. H. Dall,^ " are 

 clearly not P. effusa, yet in the absence of typical specimens of P. 

 leana * it still remains doubtful whether they belong to the latter 

 species. Messrs. Adams' description answers pretty well, except 

 that my specimens, instead of being thinner, are much more solid 

 than the effusa. I propose, therefore, to indicate the species as 

 Pompholvx Leana, var solida , unlil more definite information be 

 obtained." 



' Ces mensurations sunt donuees d'apres la figure publiee par W. H. Dall 

 (On tlie genus Pompholyx and its allies, with a revision of the Limnaeidae of 

 authors. Annals of the Lyceum of Natural H istovv of Ne:v-York. IX. New- York. 

 1870, pi. ii. fig. ■/CI). 



' Les preniieis tmns sunt, an rontraire, aplatis et pvesqne enroules sur le 

 nieme plan chez le Pompholyx effusa I^ea. 



■'* Dali. (W. H.). loe. siif>ra oil. 1870, p. 33S-336. 



■* .'\dams (H. et A.). Pi oceedings Zoological Society of London, 1864, p. 434. 



