180 



POPULAR CONCHOLOGY. 



genus will find the most complete account of the species 

 in Mr. Reeve's " Conchologia Iconica," accompanied by 

 the most beautiful illustrations. 



Anostoma. Fischer. (Tomogeres Montf. ; Angys- 

 toma Schum.) — Shell orbicular; 

 spire obtuse ; mouth toothed, and 

 turned upwards in the adult, 

 nearly reaching the level of the 

 apex. Animal, like that of the 

 Helix. — 2 species, recent. 



rr\-\ . r> ,i • , Anostoma globulosa, 



Ine structure of this extraor- 

 dinary shell proves, that in completing the last whorl, the 

 animal carries it with the apex downwards, instead of its 

 natural position upwards, which is the case with all other 

 shells, and even with itself when young. It is very rare, 

 and is brought from the East Indies. — Only 2 species are 

 known, Anostoma depressa and globulosa. 



Tomigerus. Spix. — Shell conoidal, the last whorl 

 drawn forward in such a manner that from the base to 

 the opening of the umbilicus extends a horizontal furrow, 

 which separates the two parts of the last whorl from each 

 other; the aperture is oval, and by means of numerous 

 teeth very much contracted. Animal not known. — 3 

 species. 



From Brazil. Deshayes places these shells with Buli- 

 mus ; Beck with Anostoma ; and Reeve with Scarabus. 



Streptaxis. Gray. ( Artemon Beck. ) — Shell (C ovate 

 or oblong; when young sub -hemispherical, 

 deeply umbilicated, with rapidly enlarging 

 whorls ; at length the penultimate whorl is 

 bent towards the right and dorsal side of the 

 axis, and the umbilicus becomes depressed, s^t^ c^*3. 

 and often nearly closed ; the mouth is lunu- 



