The Annals and magazine of natural history; zoology, botany, and geology . e of this lat-ter, as suggested by Burmeister, that the gill-feet were probablyattached*. To facilitate the appreciation of those characters, Isubjoin sketches of the pleurae of the more important genera, asthe needful information is not given in the greater number offigures and descriptions of Trilobites hitherto published ; the nu-merals prefixed to each figure indicate the number of thoracicsegments in each genus. I propose dividing the family of Trilobites into the five follow-ing subfamilies :—1. Asaphhue; 2. Parad
The Annals and magazine of natural history; zoology, botany, and geology . e of this lat-ter, as suggested by Burmeister, that the gill-feet were probablyattached*. To facilitate the appreciation of those characters, Isubjoin sketches of the pleurae of the more important genera, asthe needful information is not given in the greater number offigures and descriptions of Trilobites hitherto published ; the nu-merals prefixed to each figure indicate the number of thoracicsegments in each genus. I propose dividing the family of Trilobites into the five follow-ing subfamilies :—1. Asaphhue; 2. Paradoxince; 3. OgygirKB; * The term ^fulcrum, as sometimes applied to a point on the anterioredge of the pleurre, clearly conveys a false mechanical notion, besides bein^synonymous with the already current term knee used by Pander andPovtlock. 398 Prof. F. MCoy on the Classification of Faceted pleurce of T?-ilobites. a, Calymene; b, Ellipsocephalus ; c, Asaphus ; il, Phacops; e, Odontochile;f, Dysplanus ; ff, Illffiiius; h, Forbesia ; i, Honialonotus; k, Non-faceted pleurce of Trilobites. I, Ogygia; m, Liclias; n. Bronteus ; o, Anipyx ; p, Harpes; q, Conocepha-lus ; r, Paradoxides; s, Zethus; t, Cryphaeus; u, Acidaspis; v, Stau-rocephalus; w, Olenus; x, Trinucleus ; y, Ceraurus.
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