50 PYRAMIDULA. 



The name Patula, as well as Eyryomphala, was intended to include 

 all of the forms referred now to the genus Pyramidula ; and most 

 recent authors have adopted Patula as the generic name. Such a 

 course is inadmissible on account of the earlier names Pyramidula, 

 Gonyodiscus and Discus of Fitzinger ; and there is, moreover, another 

 difficulty, for Patula, Delomphalus and Eyryomphala were all 

 proposed in the same year (1837), and it is now impossible to decide 

 which should be given priority. In von Martens' edition of Albers, 

 the type of Patula is said to be H. rotundata ; but as that species 

 was already the type of a prior group (Discus~), we cannot accept 

 such a selection. We are, therefore, obliged to consider Held's first 

 .species, H. alternata, the type. 



Species. 



P. alternata Say, iii, 57. P. strigosa Old. (PL 14, f. 37-39.) 



scabra Lam. /. depressa Ckll. 



strongylodes Pfr. f. frag His Heuiph. viii, 117. 



infecta Parr. /. carnea Hemph. viii, 117. 



v. fergusoui Bid. iii, 57. /. rugosa Hemph. viii, 117. 



v. mordax Shutt. iii, 57. /. albida Hemph. viii, 117. 



P. cumberlandiana Lea, iii, 58. /. buttoniTLemph. viii, 117. 



P. solitaria Say, iii, 58. /. globulosa Ckll. viii, 118. 



kochi Pfr. v. jugalis Hemph. viii, 117. 



subrudis Pfr. v. subcarinata Hemph. viii, 118. 



P. idahoeusis Newc. iii, 55. bicolor Hemph. viii, 118. 



v. newcombi Hemph. viii, 115. lactea Hemph. viii, 118. 



/. wasatehensis Hemph. viii, picta Hemph. viii, 118. 



[116. v. cooper! W. G. B. viii, 118. 



v. binneyi Hemph. viii, 116. P. haydeni Gabb. iii, 57. 



/. multicostata Hemph. viii, 116. /. hemphilli Newc. viii. 119. 



/. castanea Hemph. viii, 116. /. gabbiana Hemph. viii, 119. 



/. albofasciata Hemph. viii, 116. J. bruneri Anc. viii, 119. 



f. gouldi Hemph. viii, 116. oguirrhensis Hemph. 



P. strigosa Gld. viii, 117. hybrida Hemph. 



parma Hemph. 



Subgenus ATLANTICA Ancey, 1887. 



Atlantica ANC., Conch. Exch. i, p. 54, April, 1887, type H. semi- 

 plicata Pfr. 



Shell small, discoidal, with wide shallow umbilicus and low-convex 

 spire ; whorls narrow, obliquely ribbed above, polished below, the 



