240 



Helix egena (41), 42 

 electrina (38) 

 engonata (87) 

 fabricii (41) 

 fidelis (21) 

 floccata 51 

 fulva (40) 

 germana (25) 

 gularis (43), 44 

 hammonis (38), 42 

 harpa (21) 

 haydeni (52) 

 hortensis 20 

 indentata (39) 

 labiosa (24) 

 labyrinthica (27) 

 limitaris (49) 

 lineata (52) 

 lubrica (33) 

 lucida (42) 

 mandralisci (40) 

 milium (43) 

 minuscula (43) 

 minuta (22) 

 minutissima (53) 

 monodon (26) 

 morsei (39) 

 mortoni (40) 

 nitida 41, (42) 

 nitidula (39), (40) 

 nuttalliana (21) 

 paludosa (22) 

 pellucida 35, (36) 

 planorbis (80), 8r 

 ptjchophora (25) 

 pulchella (22), (23) 

 putris 55 

 pjgmaea (53) 

 radiatula (38) 

 rudis 54 

 solitaria (49) 

 spirorbis 83 

 sportella (35) 



stagnalis 59, (60), (62), (65) 

 striatella (50) 

 strigosa (51) 

 subglobosa (20) 

 townsendiana (25) 

 trochiformis {40) 



Helix trochilus (40) 



trochulus (40), 41 



vancouverensis (34) 



vellicata (34) 



virgata 52 

 Heraithalamus (97) 



nitidus 97 

 Hemphillia 48 



camelus 4S 



glandulosa 4S 

 Heterodiscus (82), S3 

 Hippeutes (82) 

 Hippeutis 82, 86, (97) 

 Hjalina (35), (39) 



arborea (42) 



arctica (45) 



binneyana (39) 



binneyi (39) 



fulva (40), (41) 



indentata (39) 



nitida (42) 



pellucida (38) 



viridula (38) 

 Hjalinia (39) 



fulva (40) 



trochiformis (41) 

 Hydroids 173-234 



bibliography 207-209 



genera and species, systematic dis- 

 cussion iSi-206 



geographic distribution 176-180 



plates and plate descriptions 210- 

 234 



lelskia (120) 

 Isidora 100, loi, 105 



wahlbergi loi 

 Isthmia ventricosa {31) 



pygmsea 33 



Jelskia (120), 121 



Laevapex 109 



fragilis no 



kootaniensis no 

 Lafoea 175, i8i, 193, 195 



adhserens 177, 196, 224 



dumosa 177, 179, igs 



fruticosa 177, 196 



