Clavis analytica 
omnium C€Cyclostomaceorum, 
in Monographia descriptorum. 
I1 Testa depressa vel discoidea. 
A. Peristomate superne alatim dilatato 
B. Peristomate superne non alato, 
a. 
b. 
recto, 
c, tenui. 
* Anfractu ultimo antice soluto 
** Anfractu ultimo non soluto. 
1. Spiraliter striata vel sul- 
cata . 
2. Oblique rugulosa aut fo- 
vio ru e tee T ien aac 
3, Simpliciter striata . 
8. incrassato 
expanso, 
c, simplice. 
l. Striata . : : 
2. Spiraliter sulcata vel lirata 
3. Disüncte carinata 
B. incrassato. 
IS briata t 1S. 
2. Spiraliter livata . 
y. duplice, 
Pterocyclos 72—87. 
Cyclotus 37—40. Aulopoma 90—92. 
Cyclophorus 177. 
Cyclophorus 162—169. Lithidion 297. 
Otopoma 299. 
Cyclotus 29. 30. 32. 34. 43—45. 47. 
Cyclophorus 170 —172. 
Cyclotus 27. 28. 31. 48. Cyclophorus 
173201745116: 
Cyclophorus 159 —161.  Cyclostomus 
017 
olí. 
Cyclotus 58. 59. 
Cyclotus 53 — 56. Cyclophorus 156. 
157. Cyclostomus 342. 343. 
Lithidion 298. Cyclostomus 314 — 316. 
319—321. 
Alycaeus 208. 
Cyclophorus 152 — 155.  Lithidion 
204—296. 
