. Bulletin of the British Museum (Natural History). . Fig. 8. V. (Thylaeodus) conlorlus, showing operculum in place in a broken aperture. Topolobampo, West Mexico, x 12. Fig. 9. V. {T.) contortus, apex of nuclear whorls, as seen from attached side, showing also the first subsequent whorl. X 12. Fig. 10. V. (T.) indentatus, operculum, full view. Guaymas, West Mexico. X17. Fig. II. Same specimen, side view of operculum. X 17. Genus SERPULORBIS Sassi, 1827 Lemintina of authors (not of Risso, 1826) ; Anguinella Conrad, 1846, preoccupied; Hatina Gray, 1847; Serpuloides Gray, 1850, preoccupied; Alet
. Bulletin of the British Museum (Natural History). . Fig. 8. V. (Thylaeodus) conlorlus, showing operculum in place in a broken aperture. Topolobampo, West Mexico, x 12. Fig. 9. V. {T.) contortus, apex of nuclear whorls, as seen from attached side, showing also the first subsequent whorl. X 12. Fig. 10. V. (T.) indentatus, operculum, full view. Guaymas, West Mexico. X17. Fig. II. Same specimen, side view of operculum. X 17. Genus SERPULORBIS Sassi, 1827 Lemintina of authors (not of Risso, 1826) ; Anguinella Conrad, 1846, preoccupied; Hatina Gray, 1847; Serpuloides Gray, 1850, preoccupied; Aletes Carpenter, 1857a; Telranemia Morch, 1859; Thylacodes MoTch, 18626. Shells among the largest of the family, the coiling of roughly concentric loops, especially in the early whorls, the later coiling in colonial forms being densely con- torted, lax, or hardly apparent. Scars of broken feeding tubes apparent on most specimens. Colour of shells ranging from dark brown to pure white. Nuclear whorls lighter in colour than the rest of the shell, of two to four whorls, globose-conic rather than cylindrical. Operculum wanting. Subgenus SERPULORBIS, s. s. (Text-figs. 12-14) Colonial forms, in the main, with tubes that are concentrically looped in the young to weakly contorted in the adult; sculpture of spiral lines variously inter- sected to form nodes or scales. Assignable species : S. (S.) arenaria (Linne, 1758). Mediterranean. (Sjoionyms : 5. polyphragma Sassi, 1827 [type species] ; Vermetus gigas Bivona-Bemardi, 1832.) S. (S.) decHssatus (Gmelin) [Serpiila]. Caribbean. S. (S.) eruciformis (Morch, 1862) [Thylacodes]. West Mexico. S. (S.) master (Deshayes, 1843) [Vermetus]. West Africa. S. (5.) medusae (Pilsbry, 1891) [Thylacodes]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural Hi
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