180 SALMONIDiE. 



Coregonus lavaretus, Kroyer, Damn. Fisk, iii. p. 55 ; Wideqren, Of vers. 



VcL Ahul. Forhandl. lf<(!8, p. 583, tab. G. f. 3, tab. 9. "f. 3 (lieads ; 



synonymy erroneous). 

 Coregonus fera, Cuv. Sf Vol. xxi. p. 472. ; Mapp, Fische des Bodensee's, 



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

 852, ix. p. 375 ; Heckel Sf Kjier, Siisswass^. p 238. ; Siebold, Siiss- 

 wassevjische, p. 251. 



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

 Cffic. pyl. ca. 170. Vert 60-61*. 



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

 total length (mthout 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, subsemicii-cular. The length of the mandible equals 

 the least depth of the tail. Back behind the head ascendmg 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 Rapp, who distinguishes the Prussian C. 

 mnrcena 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 dift'erence in 

 the length of the vertebroe, 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 

 difierence, 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. 



d. Adult : skin. Lake of Neuchatel. 



e, /-r/, li-i. Fine specimens. Lake Wenern. From Mr. Lloyd's Col- 



lection. 

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

 lection. 

 I. Adult : skin. Lake Wenern. From YarreU's Collection. 



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

 Coreijonus lavaretus, a fish which periodically ascends Siberian rivei's 

 (Obi, Kolima, &e.) and is known by the name of SchoAur. This fish 

 is most probably distinct from the Eurojiean Lavaretus, and appears 

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

 tained thrice 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. marcena). It is strange tliat the latter, a most care- 

 ful author, states 67 vertebra; for C. fera. 



