11. COREGONUS. 175 



Faun. Fisk. p. 453 (a.); L. Lloyd, Scand. Advent, i. p. 129 ; Wide- 

 ffren*, Ofvers. Vet.-Akad. Fork. xix. p. 577, t. 6. f. 2 (head). 

 B. 9. D. 14. A. 15. L. lat. 90. L. transv. 10/11. C^c. pyl. 

 ca 200. Yert. 39/23. 

 The height of the body is oue-foiirth or rather less than one-fourth 

 of the total length (without caudal), the length of the head one-fifth 

 or rather more than one-fifth. Snout much produced, with the upper 

 jaw conically protruding beyond the lower, and produced into a short 

 fleshy cone in adult specimens. The maxillary extends to the ver- 

 tical from the anterior orl)ital fold only, and its length is contained 

 three times and three-fourths in that of the head. The supplemen- 

 tary bone of the maxillary is rather narrow and elongate. Mouth 

 quite at the lower side of the snout. The length of the mandible 

 is somewhat more than the least depth of the tail. The length of 

 the lower limb of the praeoiierculum is contained once and one-third 

 in that of the posterior. Back behind the head strongly curved. 

 Pectoral as long as the head without snout. 

 Sweden. 



a, b. Fine specimens, male and female, 22 inches long. Lake We- 



nern. From Mr. Lloyd's Collection. 

 c-d, e-f. Fine specimens (half-grown). Lake Wenern. From Mr. 



Lloyd's Collection. 

 g-h. Adult : stuffed. From !Mr. Yarrell's Collection. 

 i. Adidt, male : skeleton. From Mr. Lloyd's Collection. 

 k. Intestines of specimen i. 



This species will be readily distinguished from C. oxyrhynchus by 

 its smaller scales and much longer snout, the maxillary extending 

 not so far backwards as in the other species. 



3. Coregonus microstomus. 



Salmo microstomus, Pall. Zoogr. Ross.-As. iii. p. 405. 



" Persimilis est S. oxyrhincJio, sed differt ore adhuc angustiore, 

 terminah, naso non adeo producto, corpore magis cylindraceo, 

 squamis majoribus. Flabellis branchialibus decemlameUatis ; pinnis 

 inferis paUide rubentibus ; dorsali anaUque decemradiatis, colore 

 etiam dilutiore, nitide argenteo. 



" Tantum a Lena versus orientem in fluvios adscendit e mari, am- 

 nem Lenam tantum infra ostium Kirengte frequentans, communis 

 dein in fluviis Indigirka, Kovyma, Anadyr, Ochota, Kutchtui et in 

 aquis Camtschatcse." 



This species belongs, perhaps, to the following division. 



* This author mentions C. hiemalis, Jurine, as synonymous with the Nabb-sik ! 

 and tliis is only one out of the numerous instances of confusion into which the 

 same author has attempted to throw the European Salmonoids. 



