04. A. pes-pelicani, Linn. (Strombus.)—A. quadrifidus, Tritonium, and Rostellaria p.—Brit. co. gen.; N. and S. Eu.; 4 to 100 fath., C. Outer lip with one anterior lobe.
05. A. pes-carbonis, Brongniart.—Rostellaria and A. p., and serressiana.—Zetland, 70 to 100 fath., R. Outer lip with two anterior lobes.
Cæcum.
06. C. trachea, Mont.—Dentalium and Orthocera imperforatum, C. annulatus.—Devon, Weymouth, Scotland, Cork, etc., R.; S. Eu. Ringed and striated.
07. C. glabrum, Mont.—C., Dentalium, and Orthocera minutum, and lævissimum.—Exmouth, Weymouth, Swansea, Lerwick, Bantry Bay. Rare, smooth.
Cerithium.
08. C. reticulatum, Costa, (Strombiformis.)—Murex and Terebra r.—Brit. co. gen., 0 to 20 f., C. Narrow, and closely reticulated.
09. C. metaxa, Delle Chiaje.—C. angustissimum.—Guernsey, R.; S. Eu. Lengthened, white.
10. C. adversum, Mont. (Murex.)—C., Triphoris, Turbo, and Terebra a., perversus, and reticulatus.—W. and S. Brit., Channel Isls., etc., 5 to 25 fath., Mr.
Cerithiopsis.