XXVI HISTORICAL NOTES. 



Acera (= Holospira) . 



Anoma (for C. acus, gossei and tricolor Pfr.). 



Diaphera (a group of Streptaxida) . 



Species of the genera Macroceramus and Microceramus he 

 places in Colobus, the 41st subgenus of Bulimus. 



In 1857 Pfeiffer published an interesting historical sketch 

 and revised classification of Cylindrella (Malak. Blatter, iii, 

 pp. 209-229). He recognizes these subdivisions: 



1. Thaumasia Alb. (= Anisospira, Urocoptis s. str. and 

 Autocoptis) . 



2. Mychostoma Alb. (= Eucalodium, Coelocentrum, Uro- 

 coptis sp., and Brachypodella sp.). 



3. Gongylostoma Alb. (= Urocoptis sp., Epirobia, Geome- 

 lania) . 



4. Trachelia Pfr. (= slender Urocoptis and Brachypodella) . 



5. Apoma Beck (= Apoma and Mychostoma agnesiana) . 



6. Acera Alb. (= Holospira) . 



7. Anoma Alb. (= Tomelasmus, Spirostemma). 



8. Leia Alb. (= Anoma) . 



In von Martens' edition of Albers, 1860, Cylindrella is 

 placed among the Agnatha, and subdivided thus : 



Urocoptis Beck (= Eucalodium, Ccelocentrum, large Uro- 

 coptis) . 



Mychostoma Alb. (= Anoma, Spirostemma, Brachypodella, 

 and some Urocoptes). 



Gongylostoma Alb. (= slender Urocoptes and Brachypo- 

 dellae of many groups). 



Holospira (= Holospira and Epirobia). 



Trackelia (= slender Urocoptis and Brachypodella). 



Diaphora (= Diaphera Alb.). 



Scalatella (= Geomelania) . 



The genus Macroceramus is widely separated from Cylin- 

 drella; includes the species of Microceramus and two sub- 

 genera : 



Anoma Alb. (= Anoma, Urocoptis sp., and Bulimulus sp.). 



Lia (= Leia Albers). 



It will be noted that practically no advance in the natural 

 classification of the Urocoptidce was made in the foregoing 



