184 SALMOIilD^. 



the head ascending in a gentle curve. Very pale-coloured, the fins 

 being but little tinged with black at their extremities. 



Lakes of Switzerland and South Germany. 

 a. Adult. Lake of Constance. Presented by Prof. v. Siebold. 

 j_Cj d-e. Adult. Ammer Lake. From Dr. Gemminger's Collection. 

 /. Adult : skeleton. Lake of Constance. From Dr. Giinther's Collec- 

 tion. 



ft Asiatic sjiecies. 



13. Coregonus miiksim. 



Salmo lavaretus, var. muchsun, PaUas, Rcisc, iii. p. 705. 

 Salmo rauksun, Pallas, Zoof/r. Ross.- As. iii. p. 398. 

 ? Coregonus muksun, Cuv. ^- Val. xxi. p. 494. 



D. 14-16. A. 13-15. 



Corpus compressum, latum ; dorsum inde ab ipso capitis vertice 

 gibbo insigni pinguissimo adscendens, ad pinnam dorsalem convexo- 

 subcarinatum ; abdomen convexum ; feminis valde gibbum, unde 

 latissima;. Caput longiusculum, obtusum, valde compressum, corpora 

 angustius, maxilla superiore longiore, fornicata, ad nares utrinque 

 tuberculo gibba ; lamina mystacea lata, ovali, oblonga. MaxilliE 

 scabrae, edentulae. Pinnae proportione corporis minusculae, inferoe 

 flavescentes. P. dorsi ante aequilibrium posita. Cauda carnosa, 

 proportione piscis parva, valde attcnuata, pinna bifurca, laciniis acu- 

 tissimis. Color subargenteus, dorso fuscescens. Pondus 5| librarum. 

 Longit. tota 1' 10" 6'", capitis ad opcrculorum marginem 4" 8'", di- 

 •stantia oculi a summo rostro 1", pinnarum pectoralium 3" 10'", inde 

 ad ventrales 6" 2'", inde ad analem 5" 4"', ad pinn. dorsi 9", ejus 

 latitudo 2" 3"', inde ad adiposam 5" 5"', cujus latitude basi 9", inde 

 ad p. caudse 1" 7"',hujus laciniae 3" 3"'. Latitudo maxima perpen- 

 dicularis coi-poris ante pin. dorsi 6", crassities maxima versus caput 

 2" 8"'. Altitudo capitis ad nucham 2" 6"', crassities transversa per 

 opercxila 2'". {Pallas.) 



Periodically (in autumn) ascending Siberian rivers from the Arctic 



Sea. 



14. Coregonus conorhynchus. 



Salmo oxyrhinchus, Pall. Zoogr. Ross.-As. iii. p. 403. 

 Coregonns conorhynchus, Cuv. Sf Val. xxi. p. 485. 



D. 14. A. 14. L. lat. 88. 

 A Coregonus with the upper jaw more prominent than in Cor. 

 tnarcma, from North Germany. The length of the head is one-sixth 

 of the total. Dorsal pointed, pectoral short and rounded, ventral 

 broad. {Val.) 

 Siberia. 



ttt A^nerican species. 



15. Coregonus albus. 



The Whitefish ; Attiliawmeg. 



Salmo lavaretus, Penn. Arct. Zool. Introd. p. 298, & ii. p. 298 (not 

 synou.). 



