OyCLd.SToMES. 



1183 



THE SEA LAMPREY (sw. ii.u-'sne.ion6(;at). 



p]-7n;(>MYZ().\ MAinxus. 



PliUe LIII, lis- 1. 



Anterior luujuodeiital pidtc nwdinllij recurred and hollowed from in front. Teeth on the anterior dental [date of 

 the mouth contiguous at the base. Length of the suctorial disk when closed {in adult fishes) more than half that 



of the head to the fi'rst r/ill-d/n'iiinfj. 



.Uiistela, AusoN., Mos., vers. 107. Lamproi/e da mer, Bei.ON, 

 Nat., Div. Poi.is., p. IIO. Lampetra", Rondel., De Pise, 

 p. 398. Lampreta 1. Lampreda'', Gesn., De Ai/uatil., p. 

 592; Paralip., p. "i'i. Petvomyzon' inaculosus, ordinibus 

 (lentimn circiter viifinti, Airr., Ichtlii/oL, Gen. Pine, p. (54; 

 •yi/H. Pise, p. 90. Ste6.ii, •Sondm. Beskr., pf. I, p. 297 

 {Neijenogen). Sea-Lamprei/, Penn., Brit. Zool. (ed. 177ii), 

 vol. Ill, p. B7, tab. VIII, No. 27. 



Petromijzon marinus, Lin., Hijst. Nat., ed. X, toni. I, p. 230; 

 Fna Suec, ed. II, p. 106; Gunn., Trondhj. Selsk. Skr., 

 vol. IV (1768), p. 22, not.; Bu, Fische Deutscld., pt. Ill, 

 p. 38, tab. LXXVII; Retz., Fna Suec. Lin., p. 302; 

 Born, Zeitschr. Organ. Pliys. (Heusinqer), Bd. I (1827), p. 

 170; Nii.ss., Prodi-. Ichtliijol. Scand.. p. 121; Yaur., Brit. 

 Fisli., ed. 1, vol. II. p. 448; Sel. Longoh., Fne Beige, 

 p. 226; Kr., Damn. Fi.<:k., vol. Ill, p. 1025; NiLSS., 

 Sk-and. Fna, Fisk., p. 743 ; Hckl, Kn., .Susswasser/. Ostr. 

 Mon., p. 374; Sieis., Silsswasserf. Jfitteteur., p. 368; Malm 

 (Lampetra), Gbgs Vet., Vitt. Samli. Hand!., Ny tidsf., H. 

 VIII (1863), p. 87; Mgrn (Lampreta), Finl. Fiskfna (disp. 

 Helsingf. 1863), p. 75; Couch (Petromyzon), Fish. Brit. Tsl, 

 vol. IV, p. 385, tab. CCXLVII, fig. 1 ; Blanchabd, Poiss. d. 

 eaux dotices d. I. Fr., p. 512; Canestr., Arch. Zool., Anat., 

 Fisiol. (Modena), vol. IV, p. 184; Gthr, Oat. Brit. Mus., 

 F!>A., vol. VIII. p. .501; Coll., Forh. Vid. Selsk. Chrnia 

 1874, TillfEgsh., p. 218; 1879, No. 1, p. 106; N. Mag. 

 Natiirv. Chrnia, Bd. 29 (1884), p. 122; Malm, Gbgs, Boh. 

 Fna, p. 630; Winth., Naturh. Tidskr. Kbhvn, ser. 3, vol. 

 XII, p. 61; Fedders., ibid., p. 04; Mor., flist. Nat. Poiss. 

 Fr., toni. Ill, p. 602; Bncke, Fiscli., Fischer., Fisehz. 0., W. 

 PreiL^s., p. 194; Mela. Vtrt. Fenn., p. 369, tab. X; Day, 

 Fish. Gt. Brit., Irel., v..l. II, p. 356, tab. CLXXVIII; Frbmy, 

 Conipt. Rend. Acad. Par. 1883, No. 11 (Mars 2), p. 721; 

 MOb., Hcke, Fisch. Osts., p. 159; Jord., Ford., Ann. New 

 York Acad. Sc, vol. Ill, p. 283; LiLLJ., Sv., Norg. Fna, 

 Fisk.. vol. Ill, p. 719. 



Petromyzon Lampetra, Pall., Zoogr. Ross. Asiat., vol. Ill, 

 p. tjii. 



Petromyzon Aniericaiius, Lesceur, Trans. Amer. Phil. See. 1818, 

 p. 373 (+ Petr. nigricans, p. 385); Dek., New York 



Fna, pt. IV, Fish., pp. 379 et 381, lab. 66, fig. 216; tab. 



79, fig. 247; Stor., Mem. Amer. Aoiul. Arts, Sc, N. ser., 



vol. IX, pp. 251 et 253, tab. 38, fig. 4; tab. 39, fig. 6. 

 AmmoC'i'tes /licnlor, Lesueur, 1. c, p. 386; Dek., 1. c, p. 



383, tab. 79, fig. 248; — foriimm larvaleni hnjnH spct-iei een- 



suerunt Jordan et Fordioe, 1. r. 

 Petromyzon appendix. Dek., I. c., p. 381, tab. 64, fig. 211. 

 Ammoca;tes unicolor, Dek., 1. c, p. 883, tab. 79, fig. 250; 



— form, larval, sec. JoRD., Ford. 

 Petroniyzim maculosiis, Gronov., C'«(. Fish., ed. Gray, p. 2. 



The Sen Lamprey attains a, length of abuiit 1 ni. 

 and a weight of about I'/a kilo- Still larger speci- 

 mens, weighing at least 2V4 kilo., are indeed adduced'', 

 but are certainly rare. According to Linn.eus" Wahl- 

 BOM caught at Caluiar a Lamprey of an arm's thickness. 

 In spite of its dimensions this species undergoes its 

 metamorphosis from tlie larval stages at a lengtli of 

 only about 'V4 — IV^ dm.' 



The body is Eel-like, anteriorly terete or showing 

 some lateral compression, which increases more and 

 more behind. The greatest depth, about half-way be- 

 tween the last gill-opening and the beginning of the 

 first dorsal fin, is about 7 or 8 % of the length of the 

 body. Behind the Iiody gradually tapers; but even at 

 the space between the two dorsal tins the depth is ;ibout 

 .5 or 6 % of the length. In front tlie depth is more 

 constant forward to the head, the form of which is 

 determined by the singular snout. When the fish is 

 not attached to any object, the snout is not uidike an 

 inverted spoon; but the under surface, the su('kiiig-disk, 

 can alter its position, when the tish attaches itself, till 

 the snout terminates in a more or less vertical, broadlv 



Inllg. 



" ".\ lambendis petris '. 



^ E.x lumpen, German. = dependere. 



' "A nirqog lapis et fu'Cw s. /.ivCdu sugo, quia sugcndo lapidibus adhaeret in fluviis ', Philos. Ichth.. p. 73. 



"* Pennant, Brit. Zool., vol. Ill (ed. 1776), p. 68; Day, 1. c, p. 359. 



' Fna Suec, I. c. 



/ Dekay states the length of Petromyzon appendi.i- at 101 — 152 mm. Storek adduces a length of 76— 17H mm. ioT Petrom. nigri- 

 In Scandinavia SchagerstbOm (according to Lilljeborg), M.alm, and Collett have found fully developed Sea Lampreys ^ibout 14' j cm. 

 The larva; (Ammoccetes unicolor) attain, according to Dekay, a length of at least about 1 dm. 



o.....:.....:._ r-:.^.. 149 



