184 SALMONID^. 



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. 

 b-c, d-e. Adult. Ammcr Lake. From Dr. Gemminger's Collection. 

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

 tion. 



ft Asiatic sjiecies. 



13. Coregonus muksun. 



Salmo lavaretus, var. niuclisun, Pallas, Reisc, iii. p. 705. 

 Salmo muksun, Pallas, Zoogr. Ross.-As. iii. p. 398. 

 ? Coregonus muksun, Cuv. 8f Val. xxi. p. 494. 



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



Corpus corapressum, latum ; dorsum inde ab ipso capitis vertice 

 gibbo insigni pinguissimo adscendens, ad pinnam dorsalem convexo- 

 subcarinatum ; abdomen convexum ; feminis valde gibbum, unde 

 latissimse. Capiat longiusculum, obtusiim, valde compressum, corpore 

 angustius, maxilla superiore longiore, fornieata, ad nares ntrinque 

 tuberculo gibba ; lamina mystacea lata, ovah, oblonga. Maxillse 

 scabrse, edentulie. Pinnae proportione corporis minusculee, infersB 

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

 proportione piscis parva, valde attenuata, pinna btfurca, laciniis acu- 

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

 Longit. tota 1' 10" 6'", capitis ad operculorum 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 

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

 ad p. caudae 1" 7"',hujus laciniae 3" 3"'. Latitude maxima perpen- 

 dicularis corporis ante pin. dorsi 6", crassities maxima versus caput 

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

 opercula 2"', {Pallas.) 



Periodically (in autumn) ascending Siberian rivers from the Arctic 

 Sea. 



14. Coregonus conorhynchus. 



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

 Coregonus conorhynchus, Cnv. ^ Val. xxi. p. 485. 



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

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

 marcena, 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 American species. 



15. Coregonus albus. 



The Whitefish ; Attihawmeg. 



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

 synon.j. 



