A treatise on zoology . riHixiii);, Gun. (From Jordan .and Eveiniann.) Sdb-Family 1. ScYLLiiNAE. P((/aeosci/Z/mm, Wagn.; Jurassic, , Kromb.; Cretaceous, Asia. Scyllium, Cuv. (Sciilliorhinus); widelydistributed, occurs in the Cretaceous strata of Europe and Asia. Pristiurus,Bon. ; Euroi^ean coasts, and Jurassic, Via. 110. A, portion of a branchial arch of Cetorhirius (Selache) maximus, Cuv. B, head of a Mackerel,Si-onihcr scomber, L., from which the left operculum has been removec?. hr, gill-ray; c, cutsurface of ceratoliyal ; , gill-arch
A treatise on zoology . riHixiii);, Gun. (From Jordan .and Eveiniann.) Sdb-Family 1. ScYLLiiNAE. P((/aeosci/Z/mm, Wagn.; Jurassic, , Kromb.; Cretaceous, Asia. Scyllium, Cuv. (Sciilliorhinus); widelydistributed, occurs in the Cretaceous strata of Europe and Asia. Pristiurus,Bon. ; Euroi^ean coasts, and Jurassic, Via. 110. A, portion of a branchial arch of Cetorhirius (Selache) maximus, Cuv. B, head of a Mackerel,Si-onihcr scomber, L., from which the left operculum has been removec?. hr, gill-ray; c, cutsurface of ceratoliyal ; , gill-arch ; , gill-lamella ; i, inner surface of gill-arch ; op, cutedge of operculum ; r, anterior gill-raker ; s, outer septum ; t, posterior gill-raker. Sub-Family 2. Orectolobinae. Chiloscyllium, M. and H.; IndianOcean and Pacific, and Miocene, Europe. Ginglysmostoma, M. H., tropicalseas ; and Eocene, Europe and N. America. Stegostoma, M. and H.;Indian Ocean. Orcdolobus, Bon. {Crossorhimis, M. and H.); , Regan. .« Family Lamnidae. Large sharks without naso-oral grooves, withwide external gill-slits, and with spiracles minute or closed. A lateral I50 SELACHII keel is developed on each side of the tail. A pit is present at the baseof the caudal fin. The large pointed teeth are tilled with osteodentine. In Cetorhinus (which is sometimes p
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