1. S.VLMO. 83 



12. Salmo lacustris. 



The Schweb-Forelle of the Lake of Constance. 



We retain the specific denomination of " lacustris " for this species, 

 although neither Ai-tedi nor Liune had an exact knowledge of it, 

 evidently confounding different fishes, one of which is the lacustiine 

 species of Swiss lakes mentioned by Gesner and WHlughby. 



Trutta magna vef lacustris, Gesner, p. 1200 (fig. et pars descript.). 



Trutta seu Fario lacustris, Gesner, p. 1210 (part.). 



Schwfibforine, Gesner, p. 1203. 



Trutta lacustris, Will. p. 198 (synon. part., fig. copied from Gesner). 



Salmo no. 9, Arfecli, Synon. p. 25 ; and uo. 4, Gen. p. 12. Diagnosis 



copied from WiUughby. ("Sulco longitudinal! in ventre" is a 



character which may be seen in many specimens of all Salmonoids 



some time after death). 

 Salmo lacustris, L. Si/st. Nat. i. p. 610. 



Salmo scliiftermiilleri, liltich, Fisclie Deutsclil. iii. p. 157, taf. 103. 

 Maiforche, Schrank, Natiirdlisl. llricfc, i. p. 4. 

 Silberlachs (S. schilFenniUleri), Sc/traiik, Faun, boica, i. p. 323. 

 Schweeb-Forelle, Hartm. Beschreih. JBoclensce^s, p. 147. 

 See-Forelle, Hartm. Hehet. Ichthyol. p. 111. 

 ? Salmo trutta, Meidinyer, Icones, tab. 21. 

 Salmo lacustris, Af/ass. Poiss. (Teati douce, pis. 14, 15, 15'. 

 Salar schiffermiilleri, Cuv. 8( Vol. xxi. p. 344 ; Meckel, in Sitzr/sher. 



Acad. Wiss. Wien. 1852, viii. pi. 7. figs. 1-3; Kner, ibid. 1851, vi. 



p. 244, and 1852, viii. p. 210; Heck. &• Kner, Sitssumsseriisehe, 



p. 261, fig. 145. 

 Mai-Forelle, Heckel, in Sitzysber. Acad. Wiss. Wien. 1852, viii. p. 349. 

 Fario lacustris, liapp, Fische dex Hodciiaee's, p. 27, tab. 3 (fig. optima). 

 Salar lacustris, Ilrck. S,- Kner, Siissu-axserji^che, p. 2G5, fig. 147. 

 Trutta lacustris (sterile), SicboUl, SUsswasserJische, p. 302. 



D. 13. A. 11. P. 13. V. 9. L. lat. 120. L. trans. 26/30. 

 Csec. pyl. 60-74. Vert. 60-61. 



Largest specimen observed 30 inches ; female mature at a length 

 of 18 inches. 



Head compressed, low, rather small when compared with the 

 body ; body slender. The posterior point of junction of operculum 

 and subopercuhim is nearer to the lower anterior angle of the siib- 

 operculum, than to the upper end of the gill-opening. Lower limb 

 of the praeoperculum rather distinct, farming a very obtuse angle 

 with the hinder one. Snout produced, conical ; male with an obtuse 

 and short mandibulary hook. Maxillary much longer than the snout, 

 strong and dilated in its hinder portion ; in specimens 14 inches 

 long it extends to below the hinder margin of the orbit, and beyond 

 the latter in larger examples. Teeth strong ; the head of the vomer 

 is triangular, broader than long ; the teeth of the bodj^ of the vomer 

 form a single or sometimes a zigzag series, and are persistent throngh- 

 out life. Fins well developed; the pectoral is pointed, its length 

 being one-half, or more than one-half, of the distance of its root from 

 that of the ventral. Caudal always with the lobes angiilar, emar- 

 ginate, appearing truncate in old examples only when stretched to 

 the utmost extent ; in specimens 18 inches long the middle caudal 



g2 



