Aplysiide, 31. 
Aporrhaide, xvi., 38. 
Aporrhais, Xvi. 
pes- -pelicani, xvi., 58. 
Serresianus, XV1. 
Aquillide, xv. 
Aquillus, xv. 
cutaceus, Xv. 
nodifer, xv. 
Arca. 
lactea, 64. 
minuta, 65. 
nucleus, 65. 
pilosa, 64. 
Arcacea, xxvii., xxviii. 
Arcide, xxvii., xxviii., 64. 
Arctica, Xxx., Xxxul., 76. 
islandica, 76. 
Arcticide, xxx., 76. 
Argiope, 96. 
capsula, 96. 
cistellula, 96. 
Arianta, x. 
arbustorum, x., 12. 
Arion, xil., 4. 
ater, 4. 
var. albolateralis, 4. 
circumscriptus, 4. 
var. americanus, 4. 
,, subalbidus, 4 
hortensis, 4. 
Arionide, viii., 4. 
Artemis. 
exoleta, 85. 
lincta, 85. 
Assiminea, xvill., 48 (see errata). 
Grayana, xvill. 
littorina, 48. 
Assimineida, xviii. 
Astarte, xxx., 76. 
sulcata, 76. 
triangularis, 76. 
Astartide, xxvii., xxx., 76. 
Auriculida, xi., 19. 
Avicula, xxix. 
98 
Aviculids, = xxvili., 
sedben (Nh 
Axinus, XXX., XXXil. 
Azeca, x1., 18. 
tridens, 18. 
Balea, xi. 
fragilis, 16. 
Balia (see errata). 
perversa, 16. 
Barbatia, xxvil., 64. 
lactea, 64 
Barleeia, xviii., 46. 
rubra, xvii, 46. 
var. unifasciata, 46. 
Bithinia, xvii. 
Leachu, 47. 
tentaculata, xvill., 26, 47. 
ventricosa, XV111. 
Bittium, xvi. 
reticulatum, xvi., 38. 
Bivalves, 64. 
Brachiopoda, 96. 
Buccinide, xv. 
Buccinopsis, Xv. 
Buccinum, xv., 35. 
undatum, 35. 
Buliminus, x1. 
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, Xl. 
ventricosd, X11. 
ventrosa, xii. 
Bullea. 
punctata, 30. 
Bullina, xu. 
Bullinella, xii. 
cylandracea, x11. 
C. 
Cadulus, xxv. 
subfusiformis, xxv. 
Jeffreysi, xxv. 
XXViil., 
