CAMILLUS. Montf. A genus founded upon a minute spiral shell, with a triangular aperture, turned over the back of the last whorl. It is figured in Soldani's Testacea Microscopica. CAMPULOTUS. Guettard. MAGILUS, Auct. CANAL. A groove which characterizes some spiral univalves, where the inner and outer lips unite at the front part of the aperture. This canal is drawn out in some shells to a considerable length, in others it is turned abruptly over the back. The family Canaliferæ, Lam. (fig. 372 to 401), are all provided with this canal. CANALICULATED. Applied generally to any distinct groove or canal. CANALIFERA. (_Canalifères_, Lam.) A family belonging to the order Trachelipoda, Lam. nearly corresponding with the family Entomostomata in De Blainville's system, and described as having a canal of greater or less extent at the anterior part of the aperture. This canal is sometimes straight, sometimes tortuous, and in some genera it is recurved over the back of the shell. All the shells have an operculum, and the thickness of the perfectly formed outer lip does not increase with age. The Canalifera are characterized by having a canal, in distinction from the Purpurifera, which have only a notch. This family contains the following genera, 1. CERITHIUM. Club-shaped. Fig. 372. 2. POTAMIS. The same, fresh water. Fig. 377. 3. NERINEA. The same, with internal folds. Fig. 374. 4. TRIPHORA. Anterior and posterior canals closed so as to present three openings. Fig. 375, 376. 5. TELESCOPIUM. Pyramidal, trochiform. Fig. 378. 6. PLEUROTOMA. A slit on the upper part of the outer lip; including _Clavatula_. Fig. 379, 381. 7. TURBINELLA. Three horizontal folds on the columella. Fig. 382, 383. 8. SPIRILLUS. Spire papillary; one fold on the columella. Fig. 384. 9. CANCELLARIA. Three folds, and internal costæ. Fig. 385. 10. FASCIOLARIA. Oblique folds, the lowest the largest. Fig. 386. 11. FUSUS. Fusiform; no folds on the columella. Fig. 387. 12. PYRULA. Pear-shaped. Fig. 388 to 390. 13. STRUTHIOLARIA. Outer lip thickened; sinuated. Fig. 391. 14. RANELLA. Two rows of varices; a canal at each extremity of the aperture. Fig. 393, 394. 15. MUREX. Three or more rows of varices; only one distinct canal. Fig. 395, 396. 16. TYPHIS. A tubular perforation between each varix. Fig. 397. 17. TRITON. Varices not in rows. Fig. 398 to 401.