. Cassell's natural history. Animals; Animal behavior. are found living ill the West Indies, Britain, New Zealand, itc. Genus Limopsis is like a small oblique Pectuncidus, with a triangular cartilage pit in the centre of its hinge. Four species are known living in the Red Sea, Japan, Britain, ifec. Genus Niicida. In this genus the valves are somewhat triangu- lar, with their beaks tiu'ned backward ; iiitei-ior of valves pearly, liiiige with a large cartilage pit, and numerous sharp teeth on each side. The NuculsB are burrow^ers, and have very wide distribution, from Norway to Japan, living fro
. Cassell's natural history. Animals; Animal behavior. are found living ill the West Indies, Britain, New Zealand, itc. Genus Limopsis is like a small oblique Pectuncidus, with a triangular cartilage pit in the centre of its hinge. Four species are known living in the Red Sea, Japan, Britain, ifec. Genus Niicida. In this genus the valves are somewhat triangu- lar, with their beaks tiu'ned backward ; iiitei-ior of valves pearly, liiiige with a large cartilage pit, and numerous sharp teeth on each side. The NuculsB are burrow^ers, and have very wide distribution, from Norway to Japan, living from five to more than 100 fathoms in deptli. Seventy living species are known. Genus Leda resembles Nucula, but the shell is more elongated and pointed behind. It is fouiid in the Northern and Arctic seas, living from ten to 200 fathoms. Genus SulenelUt. In tlus genus the shell is nearly oval ; the valves are pearly within ; the hin^e ligament is external; the line of the mantle has a large and deep fold ; the siphonal tubes are joined together ; they are long and slender, and can be drawn completely into the shell. They are found living at Valparaiso, New Zealand, &c. Genus Solemya. The valves of the shell are somewhat cylindri- cal and elongated, and gape at each end. They are covered with a dark horny epidermis, which overlaps the margins. There are no hinge teeth. Four species only are known in America, Africa, and the Canaries. FAMILY Vn.— The shells of this family have the valves equal, triangular in form, closely fitting, with the umbones of the valves turned back- _ wards. The hinge teeth are diverging, the border of the mantle is simple, the interior of the shells pearly; the hinge ligament is external. The foot is long and curved; there ai'e two gills on each side, and the mantle is open. In the genus Trigonia the shell is thick and ornamented with tubercles, or with libs arranged in concentric or radiating lines; the posterior side of the valves is an
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