| Order. Sessile Cirripedes.
|
| 489.
|
Pyrgoma monticularia. Sub-genus, Daracia, Gray, back and front.
|
| 490.
|
The same, in situ.
|
| Fam. Myaria.
|
| 491.
|
Lyonsia Norvegica. Anatina, Nonnul. Inside view of both valves.
|
| 492.
|
Outside, with the valves closed.
|
| 493.
|
Næra longirostrum. Anatina longirostris, Lam. Inside of both valves.
|
| 494.
|
Outside, with both valves closed.
|
| 495.
|
A smaller species of Næra, shewing the inequality of the valves.
|
| Fam. Mactracea.
|
| 496.
|
Amphidesma tennis. Abra, Leach.
|
| 497.
|
Ervillia nitens.
|
| Fam. Corbulacea.
|
| 498.
|
Potamomya, of some authors. A fresh-water shell resembling Corbula.
Outside, valves closed.
|
| 499.
|
Inside of both valves.
|
| Fluviatile Conchacea.
|
| 500.
|
Cyclas amnica. Pera, Leach.
|
| Fam. Cardiacea.
|
| 501.
|
Cardilia semisulcata. Isocardia semisulcata, Lam. Internal view.
|
| 502.
|
External view of the same valve.
|
| 503.
|
Cardium apertum. Papyridea, Sw.
|
|
504.
|
The same, shewing the umbones.
|
| 505.
|
Pleurorynchus, fossil, (from Mineral Conchology.)
|
| Fam. Phyllidiana.
|
| 506.
|
Chiton fascicularis. Phakellopleura, Guild.
|
| 507.
|
—— amiculatus. Amicula, Gray.
|
| Fam. Calyptracea.
|
| 508.
|
Scutella, Brod. Internal view.
|
| 509.
|
External view of the same.
|
| 510.
|
Ancylus, a reversed species, illustrating the genus Velletia, Gray. Enlarged view.
|
| 511.
|
The same, natural size.
|
| 512.
|
Pedicularia. Enlarged figure, (copied from Swainson.)
|
| 513.
|
The same, natural size, growing on coral.
|
