PURPURIFERA. Lam. (_Purpura_, purple; _fero_, to carry.) A family belonging to the second section of Lamarck's order Trachelipoda, the shells of which are described as having a very short recurved, or ascending canal, or else only a notch between the inner and outer lips. The name Purpurifera has been given to the family because the animals which it includes, and particularly the genus Purpura, contain the colouring matter from which the ancients obtained the well known splendid purple. This family contains the following genera. 1. CASSIS. Outer lip thick, reflected, denticulated, canal turned suddenly over the back; spire short; including _Cassidea_ and _Cypræcassis_. Fig. 410 to 412. 2. CASSIDARIA. Canal turned gently upwards. Fig. 407, 408. 3. ONISCIA. Inner lip granulated; canal short. Fig. 409. 4. BUCCINUM. Outer lip thickened not reflected; canal short; including _Cyllene_ and _Phos._ Fig. 416, 421, 422, 425. 5. NASSA. The same, with a notch or tooth at the extremity of the columella; including _Cyclops_. Fig. 423, 424. 6. DOLIUM. Swelled, grooved spirally; outer lip not reflected. Fig. 420. 7. PURPURA. Aperture large; columellar lip flat; including Tritonidea. Fig. 414, 415. 8. MONOCEROS. The same, with a tooth on the outer lip. Fig. 417. 9. CONCHOLEPAS. Patelliform; aperture as large as the shell. Fig. 417. 10. RICINULA. Columellar and outer lips granulated, denticulated, outer lip digitated; including _Tribulus_. Fig. 413. 11. TRICHOTROPIS. Hairs on the epidermis, along the keels. Fig. 429. 12. TEREBRA. Elongated, with a spiral groove near the suture of the whorls. Fig. 428. 13. BULLIA. Short; aperture wide; outer lip marginated. Fig. 427. 14. EBURNA. Like Buccinum, but the outer lip not thickened. Fig. 426. 15. HARPA. With varices at regular intervals. Fig. 419. PUSIA. Sw. A sub-genus of Tiara (Mitra.) (Sw. Malac. p. 320.) PUSIODON. Sw. A genus of "Lucerninæ," Sw. (Helix) thus described: "Shell flattened, smooth; the body-whorl large, and much dilated at the aperture; spire small, flat, of three or four contracted whorls; aperture very oblique, sinuated, or obsoletely toothed at the base of the outer lip, which is spreading and sub-reflected; inner lip obsolete; umbilicus open. Zonaria Chemn. 132. f. 1188. auriculata Zool. Ill. I. pl. 6." Sw. Malac. p. 330. PUSIOSTOMA. Sw. A genus of the family "Columbellinæ." Sw. Thus described: "general form of Columbella, but the outer lip is only toothed in the middle, where it is greatly thickened; inner lip convex between the granular teeth; punctata, E. M. 374. f. 4. mendicaria, 375. f. 10. turturina, 314. f. 2. fulgurans. Lam." Sw. Malac. p. 313.