Aplysiide, 31. 
Aporrhaida, xvi., 38. 
Aporrhais, xvi. 
pes-pelicani, xvi., 38, 
Serresianus, xvi. 
Aquillidee, xv. 
Aquillus, xv. 
cutaceus, xv. 
nodifer, xv. 
pilosa, 64. 
Arcacea, xxvii., xxviii. 
Arcide, xxvii., xxviii, 64. 
Arctica, xxx., xxxii., 76. 
islandica, 76 
Arcticide, xxx., 76. 
Argiope, 96. 
capsula, 96. 
cistellula, 96. 
Arianta, x. 
arbustorum, x., 12. 
Arion, xii., 4. 
ater, 4. 
var. albolateralis, 4. 
circumscriptus, 4. 
var. americanus, 4, 
», subalbidus, 4. 
hortensis, 4. 
Arionide, viii. 4. 
Artemis. 
exoleta, 85. 
lincta, 85. 
Assiminea, xviii., 48 (see errata). 
Grayana, xviii. 
littorina, 48. 
Assimineide, xviii. 
Astarte, xxx., 76. 
sulcata, 76 
triangularis, 76. 
Astartid, xxvii., xxx., 76. 
Auriculide, xi., 19. 
Avicula, xxix. 
98 
Aviculids#, = xxvii., 
xxix., 70. 
Axinus, XxXx., XXxil. 
Azeca, xi., 18. 
tridens, 18. 
Balea, xi. 
fragilis, 16. 
Balia (see errata). 
perversa, 16. 
Barbatia, xxvili., 64. 
lactea, 64. 
Barleeia, xviii., 46. 
rubra, xviii., "46. 
var. unifasciata, 46. 
Bithinia, xviii. 
Leachii, 47. 
ventricosa, xviii. 
Bittium, xvi. 
reticulatum, xvi., 38. 
Bivalves, 64. 
Brachiopoda, 96. 
Buecinide, xv. 
Buccinopsis, xv. 
Buccinum, xv., 35. 
undatum, 35. 
Buliminus, xi 
montanus, 14. 
obscurus, 13, 
var. alba, 13. 
Bulimus, 9, 15. 
acutus, 9. 
montanus, 14. 
obscurus, 13. 
Bulla. 
akera, 29. 
expansa, xii. 
fontinalis, 25. 
globosa, xii. 
hydatis, 29. 
hypnorum, 26. 
patula, 38. 
punctuta, 30. 
utriculus, xii. 
ventricosa, xii, 
ventrosa, xii. 
Bullza. 
punctata, 30. 
Bullina, xii. 
Bullinella, xii. 
cylandracea, x1i. 
C. 
Cadulus, xxv. 
subfusiformis, xxv. 
Jeffreysi, xxv. 
tentaculata, xviii., 26, 47. 
Xxvill., 
