48 PYRAMIDULA. 



P. sudensis Pfr. iii, 30. P. zapateri Hid. 



P. textilis Sh. iii 31. 



American species. 



P. perspectiva Say. iii, 20. P. striatella A nth. iii, 20. 



patula Dh. v. catskillensis Pils. 



P. bryanti Harp, iii, 43. v. cronkhitei Newc. iii, 21. 

 P. horni Gabb. iii, 21. 



Section Lyrodiscus Pilsbry, 1893. 



Lyra MOUSSON, Rev. Fauue Malac. Canar., p. 26. Not Lyra 

 Cumber!., 1816. 



Shell depressed, with large open umbilicus and low-convex spire, 

 in form being like Patula; surface sculptured with slight growth-lines 

 and numerous elevated cuticular spiral threads. Type H. circumsessa 

 Shuttlew. Anatomy unknown. Distribution, Canary Islands. 



P. circumsessa Sh. P. torrefacta Lwe. 



Subgenus PATULA Held, 1837. 



Patula HELD, Isis, 1837, p. 918 (proposed for alternata, rotundata, 

 solaria, perspectiva, ruderata, pygmcea, rupestris). Eyryomphala 

 BECK, Index Moll. p. 8 (proposed for solitaria, alternata, perspectiva, 

 ruderata, solaria, rudis, rotundata, rupestris, pygmcea, pusilla, lineata 

 and some undescribed Amphidoxa or Steplianoda species). Euryom- 

 phala HERM. et al. Anguispira MORSE, Obs. Terr. Pulm. Maine, 

 p. 11, type H. alternata Say. 



Shell rather|large and solid, with convex spire and open umbilicus ; 

 whorls rounded or carinated at the periphery. Surface striate, 

 ribbed-striate or spirally ribbed, obliquely flamed, unicolored or 

 spirally banded ; lip thin, simple. Type P. alternata Say, pi. 14, 

 figs. 34, 35, 36. 



Animal having a large foot, its length greater than the diameter 

 of the shell, the tail rounded ; sole without any traces of longitudinal 

 divisions ; the foot-margins having a wide border above, bounded by 

 a distinct groove, the grooves meeting over the tail (fig. 40). Kye- 

 peduncles long and slender, tentacles minute. Mantle edge thick 

 (pi. 14, figs. 40, 46, P. alternata). 



