180 SALMONID^. 



Coregonus lavaretus, Kroyer, Damn. Fisk. iii. p. &5; Widegren,Ofvers. 



Vet. Akad. Forhandl. 1863, p. 583, tab. 6. f. 3, tab. 9. f. 3 (heads ; 



s\Tionymy erroneous). 

 Coregonus fera, Cuv. ^ Val. xxi. p. 472. ; Rapp, Fische des Bodensee' s, 



f. 18. taf. 2 (excellent figure) ; Heekel, Sitzgsber. Ak. Wiss. Wien, 

 862, ix. p. 375 ; Heekel Sf Kner, Susswasserf. p 238. ; Siehold, Siiss- 

 ^vasserjisclie, p. 251. 



B. y. D. 14. A. 15. L.lat. 90-94. L. transv. 11/12. 

 Ceec. pyl. ca. 170. Yert 60-61*. 



The height of the body is contained thrice and two-thirds in the 

 total length (without caudal), the length of the head nearly five 

 times. Snout of moderate length, obliquely truncated, with the 

 upper jaw projecting beyond the lower. The maxillary extends to 

 below the anterior portion of the adipose eyelid, and its length is 

 contained from three times and four-fifths to four times and one-third 

 in that of the head. The supplementary bone of the maxillary is 

 broad, short, subsemicircular. The length of the mandible equals 

 the least depth of the tail. Back behind the head ascending in a 

 gentle curve. Pectoral somewhat longer than the head without 

 snout. 



Great lakes of Switzerland, Tyrol, Pomerania, Mecklenburg, and 

 Sweden. 



We cannot agree with Rajip, who distinguishes the Prussian C. 

 marcena from the Swiss C.fera, attaching specific value to characters 

 which do not hold good even for specimens from the Lake of Con- 

 stance — as the length of the fins, &c. As regards the difference in 

 the length of the vertebrae, we refer to our remark in the foot-note. 

 Swiss specimens have generally the maxillary a little shorter when 

 compared with the length of the head; but this is the only visible 

 difference, and there are Scandinavian specimens which have this 

 bone quite as short. 

 a. Fine specimen, 24 inches long. Lake of Constance. Presented 



by Prof. V. Siebold. 

 h-c. Adult. Lake of Constance. From the Stuttgart Museum. 

 cl. Adult : skin. Lake of Neuchatel. 



e,f-g,h-i. Fine specimens. LakeWenern. From Mr. Lloyd's Col- 

 lection. 

 h. "Many young specimens. Lake Wenern. From Mr. Lloyd's Col- 

 lection. 

 I. Adult: skin. LakeWenern. From YarreU's Collection. 



Pallas, Zoogr. Ross. -As. iii. p. 395, describes under the name of 

 Coregonus lavaretus, a fish which periodically ascends Siberian rivers 

 (Obi, Kolima, «fec.) and is known by the name of Scliohur. This fish 

 is most probably distinct from the European Lavaretus, and appears 

 to have a considerably longer maxillary, the length of which is con- 

 tained tftfice and a fourth only in that of the head. 



* This number has been found by me in two specimens from the Lake of 

 Constance {C.fera), in two from Lake Wenern (C. lavaretus), and by Eapp in 

 a Mecklenburg specimen ( C. marcBna). It is strange that the latter, a most care- 

 fid author, states 67 vertebne for C. fera. 



