11. COREGONTTS. 197 



lineam lateralem cserulescens, dorso fnscus. PinnaB dilute fuscEe, 

 dorsales et ventrales (fere anteriores) nigriores. Cauda profunde 

 bifurca, lacinia inferioro angustioi-e. Longitudo totius piscis (solita) 

 12" 9'", capitis cum operculis 2" 1|"', a summo rostro ad oculos 6|"' 

 ad pin. pectoralcs 2" 3|"', inde ad ventrales 2" 10'", longitudo ap- 

 pendicum 4|"', hinc ad analcm 2" 11'", hujus latitude 1" 10'", a 

 rostro ad pin. dorsi 5" 2'", hujus latitudo 1" 5'", inde ad adiposam 

 3", quce basi lata fere 5'", ab eaque ad pin. caudiB 1" 2'". Maxima 

 latitudo corporis ad pin. dorsi 3" 1'", crassities 1" 5'", capitis alti- 

 tudo ad nucham 1" Tj ", ejudem crassities 1" 1|"', (Pallas.) 

 Siberia. 



35. Coregonus tug^un. 



Salmo tugun, Pallan, Zoogr. Ross.-As. iii. p. 414. 

 Coregonus tugun, Cuv. 4' Val. xxi. p. 519. 



D. 12. A. 16. 



Digitali rare major, sed dantur ad staturam Set 6 pollicum. 

 Forma, colore et magnitudine Cyprino leucisco similis, quorum et 

 promiscue capitur. Dorso minus conveso, quam Albula, imo rectiore 

 quam abdomen. Caput corpore compressius, supra a nucha ad ros- 

 trum angulo lougitudinaK obsolete carinatum ; rostrum breviter 

 conicum, obtusiusculum, maxilla inferiore paulo longiore, utraque 

 edentula. Oculi magui. Corpus squamis, ut in Albula, tenuibus, 

 argenteis ; dorsum fuscescens. Cauda profunde bifurca, lobis sub- 

 sequalibus. Longitudo in descripto 3" 7'", capitis 8'", ad pin. pec- 

 toralcs 8'", inde ad ventralem 10|"', inde ad p. ani 8|"', hujus lati- 

 tudo 6'", inde ad pimiam caudae 3|"', caudse laciniae 7'", ad pinnam 

 dorsi 1" 5'", ejus extensio 5'", inde ad adiposam 8'", a qua distat 

 initium pin. caudee 6'", latitudo summa corporis ante p. dorsi 73'", 

 crassities vix ultra 4'". {PaUas.) 



Sibeiia. 



36. Coregonus rudolpManus. 



Cuv. Sf Val. xxi. p. 531. 

 D. 13. A. 15. V. 13. L. lat. 75. L. transv. 9/11. 



The height of the body is rather more than the length of the head, 

 which is one-fifth of the total length (^vithout caudal) ; head low, 

 longish. The distance of the occiput from the front margin of the 

 upper jaw is less than one-half of its distance fi'om the origin of the 

 dorsal fin. The length of the maxillary is contained thrice and one- 

 third in that of the head; that of the mandible equals the least 

 depth of the tail. Pectoral as long as the head, without snout. 

 There are eight longitudinal series of scales between the lateral Line 

 and the root of the ventral fin. 



Probably from Siberia. 



I have examined the typical specimen from Pallas's collection in 

 the Berlin Museum, a skin 15| inches long, in a bad state of x>re- 

 scrvation, which ought never to have been used for introducing an 

 almost nominal species into the system. 



