5. PLECOGLOSSTTS. 165 



may prove to be more closely allied on comparison of actual speci- 

 mens. The following notes are an abstract of Giildenstadt's de- 

 scription : — 



Salmo leucichthys, Giildenst. Nov. Comm. Petrop. xvi. p. 633 ; Pall. 



Zoogr. Ross.-As. iii. p. 392. 

 nelma, Pall. It. n. p. 716 ; Lepechin, Reise, ii. p. 192, taf. 9. 



figs. 1-3. 



B. 10. D. 15. A. 14. V. i:. [Vert. 65, LepecUn]. 



Statura et magnitude S. Solaris. Kostrum obtusissimum : man- 

 dibula superior latissima, integra, recta ; inferior adscendens, sub- 

 conica, apice tuberculoso, ante superiorem prominens ; utraque 

 edentula ; rictus terminalis amplissimus, quadratus ; lingua trian- 

 gularis, soluta, subaspera ; oris cavitas alba, immaculata ; palatum 

 latum, planum, antrorsum utrinque subasperum denticulis minimis, 

 tactu, non "visu, percipiendis ; nares medium inter rostrum et oculum 

 occupantes, apertura utrinque gemina, angusta ; oculi laterales, 

 liberi, ampli. Squamte pro mole piscis baud adeo magnse. Anu^ 

 caudae multo propior, quam cupiti, proximo ante pintiam ani, aper- 

 tura duplici. 



Magnitude tripedalis vulgo, non raro ultra. 



Caspian Sea ; periodically ascending, the Wolga and other rivers 

 of Russia. According to Lepechin and Pallas the same species 

 would be found in the Arctic Ocean, ascending the rivers Ob, Lena, 

 Kolima, (kc. 



5. PLECOGLOSSUS. 



Plecoglgssus, ScJimj. Fatm. Japon. Poiss. p. 229. 



Body covered with very small scales. Cleft of the mouth wide ; 

 maxiUary long. Dentition feeble : ' intermaxillaries with a few 

 small, conical, pointed teeth ; the teeth of the maxillaries and man- 

 dibles are lamelliform, broad, truncated, lamellated and serrated, 

 moveable, seated in a fold of the skin ; the mandibles terminate 

 each in a small knob, and are not joined at the symphysis. The 

 mucosa in the interior of the mouth between the terminal halves 

 of the mandibles forms a peculiar organ, being raised into folds, 

 wilt a pair of pouches in front and a single one behind. Tongue 

 very small, with minute teeth, its apical part being toothless ; palate 

 apparently without teeth*. Pyloric appendages in great number ; 

 ova small. 



Japan and Formosa. 



1. Plecoglossus altivelis. 



Salmo (Plecoglossus) Bh\\e\\s,.Schleg. I. c. pi. 105. fig. 1. 

 B. 7. D. 12. A. 16. V. 8. L. lat. 140. Vert. 64. 

 The height of tne body is equal to, or rather lose than, the length 

 of the head, which is two-ninths of the total (without caudal) ; 

 head rather compressed; snout moderately produced, with its ex- 

 tremity soft and slightly swollen. Eye of moderate size. The 

 * Schlegel mentions a band of villiform teeth on each side of the palate. 



