BULIMULID^E. 171 



It is obvious that 0. miliola, fusiformis and tudiculatus are very 

 closely linked together, and probably will prove but stages in an un- 

 interrupted series of variations. All have the same sculpture, a net- 

 work of cream-white wrinkles on a darker ground. For the present, 

 tudiculatus may be distinguished by its more slender contour and 

 less broadly expanded outer lip. 



O. PATAGONICUS (Orb.). PL 26, fig. 44. 



See this vol., p. 95. A specimen from Carmen de Patagones, 

 near the mouth of the Rio Negro, Patagonia, received from Dr. H. 

 von Ihering, shows better developed teeth than those from the Sierra 

 Ventana. The shell is rather calcareous, suffused with a livid flesh 

 tint, and stained with blackish-blue above. The parietal lamella is 

 perceptibly bifid outwardly, and with the columellar lamella and 

 upper palatal fold, is well developed. There is a small basal fold, 

 but no trace of lower palatal or suprapalatal folds, or of a transverse 

 barrier within. The throat is ochre colored. The apex has rather 

 strong, very close and almost straight riblets. Length 19J, diam. 

 10 mill. 



It will be noticed that the locality of these specimens is far south 

 of the limits assigned by Doring, who thought the species did not 

 extend southwest to the Rio Colorado. 



Undetermined Bulimulida>. 



Bulimus fragilis Lam. (An. s. Vert, vi, pt. 2, p. 123; Delessert, 

 Rec. de Coq. pi. 28, f. 2), described as British, is apparently one of 

 the thin whitish tropical American species, such as Drymceus stram- 

 ineus, liliaceus^ virginalis, or their allies. It cannot be identified 

 without comparison of the type. The locality assigned by Lamarck 

 was due to his identification of it with Helix fragilis Montagu = 

 Limncea stagnalis. 



Helix (Cochlogena~) ovum Fer., Prodr. p. 54, no. 409, Bulimus 

 ovum Beck, Index, p. 52, nude name. 



Bulimus apicinus Menke. Shell ovate-acute, subperforate, the 

 apex rufous. Length 9 lines (Menke, Verzeich. Conch. Samml. 

 Malsburg, 1829, p. 6). 



Bulimus ponderosas Christofori & Jan. Shell ovate, ventricose, 

 perforate, milk white ; aperture ample, ovate ; peristome with the 

 columellar lip reflexed. Length 1 inch, diam. 7 lines, aperture 6 



