Annals & Magazine of Natural History

abdomen acute adult allied angle antennæ antero-lateral aperture apex apical appear Arenig armed Barr basal base beds Bleeker border canals carapace carina cells characters chlorophyll chlorophyll-bodies colour convex costal coxæ Crust Crustacea dactyli denticles described differs dilated Diplograptus distal end distinct dorsal ectoderm elongated elytra elytron Euomphalus female femora fossil genera genus Geodia globate Gonodactylus granulated Graptolites Hist hydrothecæ hypochlorin inch inferior inner margin joint Lapw lateral margins layer legs length Llandeilo Llandovery lobes longitudinal lower M'Coy male median middle Monograptus Museum collection narrowed nearly nucleolus oblique outer plate polypary portion postabdominal segments posterior posteriorly postero-lateral premolars Prof prothorax punctured raptorial limbs rostrum rounded scutellum sectorial shales side slender slightly smooth species specimens spicules spines sponge spots Squilla strata surface suture teeth terminal segment thoracic thoracic segments tibiæ tissue tooth transverse tubercles tubes upper uropoda ventral zone