NEOPETR^US. 153 



necessary to decide whether all these are forms of Neopctraus in 

 which the apical sculpture has degenerated, or whether they really 

 belong to other groups. In N. lobbi, N. decussatus and N. myristicus 

 a gradual loss of the apical sculpture can be traced, demonstrating 

 that in some forms of Neopetratis a smooth apex has been acquired 

 secondarily. N. rhodolarynx (Reeve), vol. xi, p. 171, has a smooth 

 nepionic shell, like that of Lissoacme. Its position is uncertain. 



B. baroni Fult. (vol. xi, p. 172) has the apical sculpture typical 

 of Scutalus, and should be removed from Neopetrceus. 



N. AHBORIFERUS Pils. Vol. xi, p. 175. 



A clear pinkish specimen, without streaks, is in coll. American 

 Museum of Natural History, New York. 



N. PLATYSTOMUS (Pfeiffer). PI. 22, figs. 81, 82. 



Vol. xi, p. 172. Specimens from Vina, Peru, are here figured. 

 They are cream-white with a fleshy tint, irregularly marked with 

 ochre and purplish-brown streaks, the peristome white at the edge, 

 purple or purple-brown within, the interior cream-tinted. The apex 

 has the form and sculpture of that of N. atahualpa. Umbilicus very 

 ample in the wider specimens, compressed in the narrower. 



Length 40, diam. 21^, longest axis of aperture 21 mill. 



Length 40, diam. 16, longest axis of aperture 18^ mill. 



N. PATASENSIS (Pfeiffer). PI. 22, figs. 79, 80. 



Vol. xi, p. 176. Two specimens, apparently referable to this 

 species, are figured. The general pattern of coloring is essentially 

 like altoperuvianus and decitf&atus. On the latter part of the last 

 whorl there are bold purple-brown markings, or the peculiar pattern 

 may be replaced by coalescent purplish-black streaks. Apical 

 whorls as in N. atahualpa, but somewhat more rounded. 



N. LOBBI (Reeve). PI. 22, figs. 83, 84, 85. 



Vol. xi, p. 177. Three specimens collected by Prof. Steere are 

 figured to show the leading stages in the loss of color-stripes. Fig. 

 83 has the typical coloration. In Fig. 84 the stripes are obsolete 

 above the periphery, except for occasional dots along the suture on 

 the last three whorls. In Fig. 85 there are no stripes whatever on 

 the blue-white surface, only the subsutural dots remaining. 



