82 HELIX-ENDODONTA. 



rotund, not descending in front, a trifle compressed below, obscurely 

 angulated around the umbilicus. Aperture oblique, lunate-rotund, 

 peristome simple, acute, margins subapproximating. 



Alt. 3, greater diarn. 6, lesser 5 mill. (M. & #.) 



Around Orange Bay, Patagonia, at 100 meters alt. 



Patula rigophila MAB., Bull. Soc. Philom. Paris, 1885-86, p. 123. 

 M. & R., Miss. Sci. Cap Horn, p. 17, t. 6, f. 7. 



Unfigured species. 



Patula (Discus) brunnescens v. Mlldff. Tenimber Is. (Timor- 

 laut). Nachr.-Bl. D. M. Ges. 1892, p. 87. 



Patula digonophora Ancey. Oahu. Bull. Soc. Mai. Fr. 1889, p. 

 171. 



Patula glissoni Ancey. Vate, New Hebrides. Le Naturaliste, 

 Feb., 1889, p. 50. Probably a Charopa. 



Patula monstrosa Ancey. . Viti-Levu, Vitian Archipelago. Ls 

 Naturaliste, 1889, p. 71. (-P. irregularis Mouss., in Mus. God- 

 efFroy, and P. irregularis Garrett, in Proc. Zool. Soc. Lond. 1887, 

 not Pat. irregularis C. Semper, teste Ancey). Probably a Char- 

 opa. 



Patula pattens Gredler. Nachr. Bl. D. M. Ges. 1890, p. 35. Pa- 

 tong, southwest Hupe, China. 



Subgenus ENDODONTA Alb., (Vol. Ill, p. 59.) 



Mr. Tryon has included Pitys Pse. (not Beck) in Endodonta, on 

 account of the difficulty of distinguishing the two groups. There 

 can be no doubt that the distinction is rather shadowy, but not more 

 so than the differences between Pitys (Pse.) and Charopa. The supply 

 of names is largely in excess of the natural divisions in this case. 

 It is not improbable that under the head ENDODONTA might be 

 included these sections : Simplicaria Mouss., Pitys Pse. not Beck, 

 Maoriana Sut., Endodonta Alb., Diaglyptus Pils., Liber a Garr., 

 Helenoconcha Pils. It is probably that Charopa and ^Eschro- 

 domus should also be inserted, in which case they would stand at 

 the head of the preceding list. 



P. PHILIPPINENSIS Semper. PI. 37, figs. 38, 39, 40. 



Shell minute, of an earthy brown color, discoidal, deeply and 

 broadly umbilicated, the umbilicus one-third the diameter of the shell. 

 Spire low-convex, very obtuse, whorls 3, the earlier H very 



