CONTENTS 
MOLLUSCA. 
Page 
Classes of . , , , . , . ,2 
Shell, term of 3 
Class I. GASTEROPODA. 
Classes of 
4 
Page 
Ord. I. Pectinibranchiata 
. 14 
III. Rostrifera 
. 15 
1. Cyclostomidce . 
. 17 
1. Cyclostoma . 
, 18 
1. 
1. elegans, f. 75. . 
. 19 
2. Littorinidcc 
. 20 
1. Assiminia 
. 21 
2. 
1. Gray ana, f. 127. 
. 22 
3. Bithiniad(B 
. 24 
1. Bithinia 
. 25 
3. 
1. tentaculata, f. 120. 
. 26 
4. 
2. ventricosa, f 121. 
. 26 
4. Viviparidce 
. 28 
1. Paludina 
. 29 
5. 
1. crystallina, f. 118. 
, 30 
6. 
2. yivipara, f. 119. 
. 31 
5. Valvatid(B 
. 34 
1. Valvata 
. 34 
7. 
1. piscinalis, f. 114. 
. 34 
8. 
cristata, f. 115 
. 36 
6. Aciculidce 
. 38 
1. Acicula 
. 39 
9. 
1. fusca, f. 66, 
. 39 
e • • 8 
Page 
Ord. IL SCUTIBEANCHIATA . 41 
1. Neritidce . . 42 
1. Neritina , . .43 
10. 1. fluviatilis, f, 124. . 46 
Ord. III. Pneumot^obranchiata 48 
I. Petrophila , , 50 
1. OnchidiadcB . . 50 
1. Onchidium . . .51 
11. 1. celticum . , .51 
IL Geophila . .52 
1. Lumbricivora . . 52 
2. Testacellidm . .52 
1. Testacellus . . .53 
12. 1. haliotideus, f. 19,20. . 54 
2. Phyllivora , . .56 
1. Arionid(B , .67 
1. Arion . . . .67 
13. 1. ater . . . ,68 
14. 2. hortensis, f. 16. .70 
2. Geomalacus . . .71 
15. 1. maculosus . .71 
