THAUMASTUS. 



a. Shell distinctly perforate or umbilicate. 



b. Large, solid species, with spiral series of granules ; three 

 earlier whorls densely wave-striate ; peristome expanded, 

 subreflexed. Group of T. melanocheilus. 



b l . Smaller, more slender forms, with coarser, very irregular or 

 dislocated wrinkles on the early whorls ; peristome but 

 slightly or not expanded. Group of T. bitseniatus. 



Shell imperforate. 



b. Early whorls finely and densely wave-striate longitudinally. 



Group of T. taunaisii. 

 b 1 . Early whorls thimble-pitted. Group of T. thompsoni. 



Group of T. melanocheilus. 

 T. melanocheilus Nyst, x, 44. T. granocinctus Pils., xiv, 126. 

 T. sangoae Tschudi, x, 45. B.flocinctus Rolle. 



B. pangose Morel., x, 198. T. foveolatus Rve., x, 4G. 



B. impressus Tschudi. 



Group of T. taunaisii. 



T. magnificus Grat., x. 46. T. achilles Pfr., x, 51. 



v. monozonalis Dh., x, 47. v. nehringi Mart., x, 51. 



T. tatutor Jouss., x, 47. T. hartwegi Pfr., x, 52, 198. 

 T. taunaisii Fer., x, 48. Zebra loxensis Miller. 



? Helix pullata Fer. T. loxostomus Pfr., x, 52. 



T. ascenderis Pfr., x, 49. T. salteri Sowb., x, 52. 



T. plumbeus Pfr., x, 49. T. thompsoni Pfr., x, 53, 198. 



T. hector Pfr., x, 50. T. yanamensis Morel., x, 54, 198. 



T. largillierti Pfr., x, 50. T. viriatus Morel., x, 54. 



B. consimilis Rve. T. requieni Pfr., x, 55. 



Group of T. Htceniatus. 



T. spixii Wagn., x, 55. B. bivittatus Phil. 



?B. hyalinus Spix. B. bifasciatus Phil. 



? Bulinus sordidus King. B.fusiformis Tschudi. 



T. inca Orb., x, 56. form unicolor Phil., x, 59. 



T. tseniolus Nyst., x, 57. v. alutaceus Rve., x, 59, 198. 



T. brephoides Orb., x, 57, 198. v. jelskii Lub., x, 58. 



T. iserni Phil., x, 57, 198. T. porphyreus Pfr., x, 60,498. 



T. tarmensis Phil., x, 60. T. jaspideus Morel., x, 61. 

 T. bitaeniatus Nyst, x, 58 ; xiv, 

 127. 



