Part 97

478. Ammonites; a, break in the shell, showing the sinuous septa.

479. Orbulites crassus. Globulites, Nonnul. Angulites, Montf. reduced.

479*. ---- discus. Aganides, Montf.

480. Goniatites striatus.

481. Scaphites æqualis.

482. Crioceratites Duvallii.

483. Turrilites tuberculatus.

484. Baculites Faujasii. Portion near the centre.

484*. Hamites cylindricus; a, internal cast of part of the shell; b, hollow external cast of the remainder.

Second Division. Monothalamous Cephalopoda.

485. Argonauta Argo.

486. Bellerophon tenuifasciata. (from Sow. Gen.)

487. The same, shewing the dorsal keel.

Order. HETEROPODA.

488. Carinaria Mediterranea.

* * * * *

EXPLANATION OF THE NEW PLATES.

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.