TABLE OF THE PLATES. iii 
MOLLUSCA. Vol. III. Page 
Plate 8. Fig. 2 . — Discorbites vesicularis, Lam. . . .18 
Fig. 3 .- — Rotalites trochidiformis, Lam. . . 18 
Fig. 4 . — Frondicularis complanata, Def. . . 18 
Fig. 5 . — Planularia auris, Def. . . .IS 
Fig. 6 . — Planosprites soutaria, Def. . . .18 
Fig. 7 . — Spirolinites cylindracea, Lam. . . 18 
Fig. 8 . — Spiro unites complanata, Lam. . . 18 
Fig. 9 . — Nummulites l.evigata . . .17 
Fig. 10 . — Nodosaria filiformis . . .18 
Plate 9. Fig. 1 . — Hamite cylindricus, Def. . . .16 
Fig. 2 . — Scap hites ajqualis, Sow. . . 16 
Fig. 3 . — Orthoceras annelatus, Bl. . . .15 
Fig. 4 . — Conularia Sowerbii, Def. . . 16 
Plate 10. Fig. 1.— Notarchus. A new genus of the Gasteropoda tecti- 
branchiata . . .46 
Fig. 2. — Pleurobranchus luniceps. a. The penis, b. b. Tentacula. 
c. The anus. d. d. The foot which everywhere projects 
beyond the body . . .45 
Fig. 3.— Animal of the Anomia. a . Part of the muscle which is 
connected with the third valve, b. The foot. c. A por- 
tion of the mantle which unites the two large valves, d. d. 
The mantle, e. e. The shell . . .87 
Fig. 4. — Animal of the Sigaretus, with its fleshy mantle enve- 
loping and concealing its shell . . .61 
Fig. 5. — Animal of the Tridacna. a. A fibrous bundle analogous 
to the threads of the Muscle, by which the Tridacna 
attaches itself to rocks, b. Aperture for the entrance of 
water, c. Opening corresponding to the anus. d. Trans- 
verse muscle . . .97 
Fig. 6. P OLYCLINUM DIAZONA* .... 116 
Plate 11. Fig. 1 . — Arion empiricorum, Fer. . . 32 
Fig. 2 . — Limas yariegatus, Fer. Drap. . . 33 
Fig. 3 . — Vitrina pellucida, Drap. . . . .34 
Fig. 4 . — Testacei.lus haliotideus, Fer. Cuv. . . 32 
Fig. 5 . — Parmacella Olivieri, Cuv. . . .33 
Fig. 6. — The head and interior rudimental parts of the Parmacella 
palliolvm, Fer. . . . . .33 
Fig. 7 . — Vaginula Taunaysii, Fer. . . .33 
Plate 12. Fig. 1 . — Helix carocolla, Lin. Cuv. . . 33 
Fig. 2 . — Helix globulosa, Lam. . . .33 
Fig. 3 . — Helix personata ; Helix sinnata, Lam. . . 34 
Fig. 4 . — Helix Guai.trriana, Lin. Cuv. . . 33 
Fig. 5 . — Helix barabinata, Feruss. . . 35 
Fig. 6 . — Helix conoidea, Drap. Cuv. . . .33 
Fig. 7 . — Helix memoralis, Lin. Cuv. . . . .33 
Fig. 8 . — Succinea rubescens, Desh. encycl. . . 36 
Fig. 9 . — Chondrus avenaceus, Cuv. . . .35 
Fig. 10 . — Chondrus variabilis, Cuv. . . 35 
Fig. 11 . — Bulimus guadalupensis, Fer. . . 34 
Fig. 12 . — Pupa striatella, Fer. . . .35 
Fig. 13 . — Clausilia inflata, Lam. . . 36 
Fig. 14 .-— Achatina Mulleri, Fer. . . .39 
Plate 13. Fig. 1 . — Helix obvoluta . . .33 
* A reduced sketch of the beautiful Polyclinum diazona, discovered by M. de La 
Roche, and recognised by M. Savigny as one of the compound Ascidiae. 
