11. COREGONUS. 197 



lineam lateralcm cserulescens, dorso fuscus. Pinnae dilute fuscse, 

 dorsales et vcntrales (fere anteriores) nigriores. Cauda profunda 

 bifurca, lacinia inferiore angustiore. Longitude totius piscis Tsolita) 

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

 ad pin. poctorales 2" 3^'", inde ad ventrales 2" 10'", longitudo ap- 

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

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

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

 latitude coi-poris ad pin. dorsi 3" 1'", crassities 1" 5'", capitis alti- 

 tude ad nucham 1" Tg'", ejudem crassities 1" 1|"'. (Pallas.) 

 Siberia. 



35. Coregonus tugun. 



Salmo tugun, Pallas, Zoofft: Poss.-As. iii. p. 414. 

 Coregonus tugun, Cuv. ^ Val. xxi. p. 519. 



D. 12. A. 16. 



Digitali rare major, sed dantur ad staturam 5 et 6 poUicum. 

 Forma, colore et magnitudine Cyprino leucisco simiHs, quorum et 

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

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

 trum angulo longitudinali obsolete carinatum ; rostrum breviter 

 conicum, obtusiusculum, maxilla inferiore paulo longiore, utraque 

 edentula. Oculi magni. Corpus squamis, ut in Albula, tcnuibus, 

 argenteis ; dorsum fuscescens. Cauda jirofunde bifurpa, lobis sub- 

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

 terales 8'", inde ad ventralem 10^'", inde ad p. ani 8g"', hujus lati- 

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

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

 initium pin. caudae 6'", latitude summa corporis .ante p. dorsi 7^", 

 crassities vix ultra 4'". (Pallas.) 



Siberia. 



36. Coregonus rudolpManus. 

 Cuv. ^ Val. xxi p. 531. 

 L. 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 (without caudal) ; head lew, 

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

 upper jaw is less than one-half of its distance from 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 longitjadinal series of scales between the lateral line 

 and the root of the ventral fin. 

 Probably from Siberia. 



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

 the Berlin Museum, a skin 15| inches long, in a bad state of pre- 

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

 almost nominal species into the system. 



