. Ein neues System der Naturgeschichte der Vierbeiner, Vögel, Fische und Insekten. Es sind feste oder feven Zähne, und über ihnen ein fmall femicircularbone. Nach der Oberseite des Kopfes ist ein fmall Rohr, oder Aper-ture, wie die cetaceous fiih: Der Bauch fwells und contracts abwechselnd, wie in thofe Tiere, die durch Mittel der Lungen atmen. Es hat tv/o dorfaljins; die firft, die über die Mitte und durch fMall Sehnen, dass Vol. III. Fuported N sind * Willough. ubi fupra. f Lapern, oder Stolz der IFI, WIU. Petromyzon Branchjalis, Lin. SJ-FT, i Britilh Zoology, ^S DIE FRIBS. Sind fcarcely vifible : die anderen
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. A New system of the natural history of quadrupeds, birds, fishes and insects . itare fix or feven teeth, and above them a fmall femicircularbone. Upon the top of the head is a fmall tube, or aper-ture, like the cetaceous fiih : The belly fwells and con-tracts alternately, as in thofe animals which breathe bymeans of lungs. It has tv/o dorfaljins ; the firft rifingabout the middle, and fupported by fmall tendons, that Vol. III. N are * Willough. ubi fupra. f Lapern, or pride of the Ifis, WiU. Petromyzon Branchjalis, Lin. Sj-ft, i Britilh Zoology, ^S THE FRIBS. are fcarcely vifible : The other takes its rife immediatelybehind it, furrounds the tail, and terminates in the mid?die fpace, between the tail and the anus *. Willuughhy defcribes two other fpecies of the lamprey ;the mucu peculiar to the marlhes and lakes of Bra%il;and the blind lamprey, a fmail round fifli, no larger thanMay worms : The laft marked round the body with 84tranfverfe lines, or annuli, reiembling thofe upon th^terreftrial worm f. * Willough. page 105. I Fide Icthyol. loco citato* r];, U- IV.. Tl«E RAYi y^ Section III. Gen, VI. The Ray, 1 HIS genus IS eafily dlllinguiftied from all other kindsof filh, by a broad, flat, and thin conformation. Thefive branchial apertures on each fide, are placed under theanimal; they Vvant the bony cpercula, and are markedby the fame peculiarities, that diflinguifii the other car-tilaginous tribes. The mouth, in all the filhes of thi^genus, is fituated quite below the head j while the bodyof the greater number is befet vvith fpines or prickles, refembling thofe on the branch of a thorn, a circum-llance from which they obtamed their ancient name *;that of ray, which we now apply to the genus, is derivedfiom the latin. This genus comprehends all the rays, thornb?cks, andflairs, or fl-iates, which are diilinguifhed by manners aslingular as their external form, IVUloughly has de-fcribed fourteen diflTerent foecies, and Linnaus nine ; ofwhich no lefs than eight frequen
