Animal. Unknown.
Shell. Oval, and, as it were, depressed by the preservation of each side of a longitudinal thickened band; aperture oval, almost symmetrical by the excavation of the columellar edge, terminating anteriorly by a short canal, often a little sloping; a sinus at the posterior junction of the two edges. This genus forms a distinct division between the Murex and Struthiolaria. Inhabits the Northern and Mediterranean Seas. One species is found in America. Fifteen living species. Five fossil.
- Ranella gigantea.
- R. candisata.
- R. ranina.
- R. bufonia.
- R. granifera.
- R. bitubercularis.
- R. anceps.
- R. leucostoma.
- R. Argus.
- R. spinosa.
- R. granulata.
- R. semigranosa.
- R. crumena.
- R. pygmæa.
- · · · · ·
- R. caudata*.
10. Genus Murex. Pl. [XI].
Animal. See Pleurotoma, above.
Shell. Usually oval; the spire but slightly elevated, roughened with longitudinal, transversal bands or varices; aperture small, quite oval, and symmetrical by the excavation of the left edge, formed by a lamina applied upon the columella, terminated anteriorly by a middling canal sometimes very long and closed; the right edge more or less furnished with varices. Operculum horny, complete, oval, nearly circular, with sub-concentric partitions; summit terminal. This genus comprehends only such shells as have only three or more varices on each whorl. These varices show how often the animal has increased the size of its shell. F. in all seas. Seventy-three living species. Two fossil.
- Murex cornutus.
- M. tenuispina.
- M. ternispina.
- M. motacilla.
- M. palmarosæ.
- M. adustus.
- M. crevicornis.
- M. microphyllus.
- M. phylopterus.
- M. trigonularis.
- M. brandaris.
- M. rarispina.
- M. haustellum.
- M. inflatus.
- M. brevifrons.
- M. rufus.
- M. acaleatus.
- M. capucinus.
- M. acanthopterus.
- M. ucinarius.
- M. crassispina.
- M. brevispina.
- M. tenuirostrum.
- M. elongatus.
- M. calcitrassa.
- M. axicornis.
- M. longispina.
- M. asperrimus.
- M. tripterus.
- M. hemitripterus.
- M. gibbosus.
- M. brassica.
- M. radix.
- M. scorpico.
- M. turbinatus.
- M. melonulus.
- M. erinaceus.
- M. costularis.
- M. angularis.
- M. cingulatus.
- M. torosus.
- M. granarius.
- M. aciculatus.
- M. ferrugo.
- M. pinnatus.
- M. triqueter.
- M. saxatilis.
- M. melanomathos.
- M. secundus.
- M. trunculus.
- M. Magellanicus.
- M. tarentinus.
- M. polygonulus.
- M. crispatus.
- M. cinguliferus.
- M. lyratus.
- M. fimbriatus.
- M. regius.
- M. funiculus.
- M. pictus.
- M. trigonulus.
- M. endivia.
- M. hexagonus.
- M. quadrifrons.
- M. anguliferus.
- M. lamellosus.
- M. scaber.
- M. vitulinus.
- M. fenestratus.
- M. subcarinatus.
- M. concatenatus.
- M. pulchellus.
- M. cristata.
- M. lubiosus.
11. Genus Triton. Pl. [XI].
Animal. As above.
Shell. Oval with straight spire and canal, middling generally wrinkled, furnished with varices, rare, scattered, and preserved in longitudinal rows; aperture suboval, elongated, terminated by a short open canal; the columellar edge less excavated than the right and covered by a callosity; operculum horny, oval, round, and rather large. Found in the Northern and Mediterranean seas. Thirty-one living species. Three fossil.