PILSBRY : NON-MARINE MOLLUSCA OF PATAGONIA. 5 1 7 



size, form and sculpture a resemblance possibly due to convergence, but 

 perhaps indicating affinity. I have not been able to actually compare 

 specimens. On account of their spirally sculptured embryonic shells 

 Hedley has referred them to the subgenus Allodiscus of the genus Flam- 

 mulina. * 



RADIODISCUS COPPINGERI (E. A. Smith). 



Helix (Patula] coppingeri Smith, P. Z. S., 1881, p. 36, pi. 4, f. 14, 140. 

 Patiila coppingeri Smith, Strebel, Zool. Jahrb., XXV, 1907, p. 159. 



The shell is described as I X i^ mm., composed of yA whorls, the 

 " umbilicus moderately small, equalling about one-sixth of the basal 

 diameter." 



It was described from Tom Bay (Dr. Coppinger), found on a rotten 

 tree. This is near Madre de Dios Island, on the west coast. Strebel 

 reports specimens which he identified as coppingeri from the west coast 

 of Tierra del Fuego, Ushuaia, and Navarin Island. While this form must 

 stand near R. patagonicus, it appears distinct by the much smaller um- 

 bilicus, if we may trust the published figures. I have not seen specimens. 

 The apical sculpture has not been described. 



RADIODISCUS MAGELLANICUS (E. A. Smith). 



Helix (Patula] magellanica E. A. Smith, P. Z. S., 1881, p. 36, pi. 4, figs. 



15, i^a. 



This species, described from the same place as the preceding, will prob- 

 ably prove to be a Radiodiscus, when the embryonic whorls are examined. 



RADIODISCUS PATAGONICUS (Suter). 



(Plate XLII, Figs, i, \a, i.) 



Pyramidula patagonica Suter, Revista do Museu Paulista, IV, 1900, p. 



334, pi. 3, f. 6, 6b. 

 Stephanoda patagonica Suter, Pilsbry, Proc. A. N. S. Phila., 1900, p. 387, 



pi. 12, f. 9-11. 



The shell is openly umbilicate (the umbilicus about one-fourth the total 

 diameter), of a uniform pale brown tint, discoidal, the spire convex but 

 low, suture deeply impressed. Whorls about y/ 2 , convex, slowly increas- 

 ing, the embryonic i} densely striate spirally, the rest radially costellate, 



1 Cf. Flammuliua (Allodiscus) roblini Petterd, as figured by Hedley in Records of the Aus- 

 tralian Museum, VII, 1909, p. 300. 



