INDEX. 



In the present index all synonyms and spurious species are in italics. Where several 

 references are given for one name, the first generally relates to the page containing the 

 full description. 



Acella, 69 

 Acella (jracilis, 69 

 Achalina (?) pellucida, 21 

 Acroloxus, 147 

 Acroloxus filosus, 147 



minutus, 148 

 nuttallii, 147 

 ovalis, 156 

 Adula, 140 

 Aclula multivolvis, 111 

 Alexia, 4 



Alexia myosotis, 4, 5 

 Ancylus, 138 

 Aucylus borealis, 156 

 calcarius, 143 

 caurinus, 144 

 crassus, 145 

 deprrnxiis, 141 

 diaplianus, 141 

 drouetianufi, 146 

 elatior, 140 

 jilosKS, 146 

 fragilis, 146 

 fuscus, 140 

 haldemaui, 141 

 kootanieusis, 144 

 minutus, 148 

 newberryi, 145, 139 

 obscurus, 139 

 parallelus, 142 

 patelloides, 144 

 rivularis, 142 

 sallei, 142 

 tardus, 143 

 Aplexa, 97 

 Aplexa anrantin, 98 

 elata, 99 

 hijpnorum, 100 

 longiuscnla, 102 

 peruviana, 98 

 snbelrmqatn, 102 

 suturalis, 102 



Aplexus (Isadora} Integra, 101 

 Auricula, 2, 25 

 Auricula hidens, 2, 11 



bidcntata, 3, 11 



biplicata, 3, 11 



cingulata, 7, 18 



coniformis, 13, 14 



cornea, 3, 10 



denticuldta, 3, 4, 5 



Jlava, 13 



Jioridana, 3, 16 



jaumei, 3, 11 



midas parva, 13, 14, 17 



monile, 13 



myosotis, 4 



nitens, 17 



ohliqua, 3, 15 



oliva, 18 



ovuJa, 14, 17 



pusilla, 17 



say a, 3, 19 



stenostoniu, 3, IS 

 Auriculidfe, 1. 

 Auriculinse, 2 



Blauneria, 20 

 Blauueria pellucida, 21 

 Buliiuuea, 37 

 Bulimnea megnsoma, 38 

 BuJimus coniformis, 14 



exiguus, 7 



monile, 13 



ovulus, 17 

 iBu^Za coffea, 14 



crasstda, 85 

 fluviatilis, 118, 116 

 Bnlinus, 97 

 Bulinus aurantius, 97 



berlandierianus, 155, 101 



crassula, 107 



distortus, 102 



elatus, 99 



( 15T ) 



