11. COREGONUS. 173 



The species may be subdivided thus : — 



a. Upper jaw produced into a cutaneous appendage, p. 173. 



/3. Upper jaw the longer, with the upper profile descending in a curve ; 

 mouth very small, p. 176. 



y. Upper jaw obtuse, longer than, or as long as lower, with the upper 

 profile nearly straight. 



* Snout obliquely truncated, with the nose proti-uding. 



t European species, p. 178. 

 t Asiatic species, p. 184. 

 t American species, p. 184. 



* Snout vertically truncated, p. 187. 



8. Lower jaw the longer {Argyrosomus, Agass.). 



* Body elongate, its height being less than one-third of the total 

 length (without caudal). 



t European species, p, 192. 

 t Asiatic species, p. 195. 

 t American species, p. 198. 



* Body elevated, its height being one-third of the total length 

 (without caudal), p. 199. 



a. Upper jaw produced into a cutaneous appendage. 

 1. Coregonus oxyrliynclius. 



Houting {Holland). Schnapel {Germany). 



Oxyrhynfchus, Rondel, ii. p. 195 (part.) ; Gesner, p. 771 ; Willughby, 



p. 187. 

 Albula nobUis, Schonev. p. 12 (not Gesner). 

 Coregonus, sp., Artedi, Synon. p. 21. no. 4j Genera, p. 10. no. 4. 

 Salmo, sp., Gronov. Zoophyl. no. 374. 

 Salmo (Coregonus) oxyrinchus, L.Syst.Nat,'^.5\2] iacep. v. pp. 263, 



267 ; Gronov. Syst. ed. Gray, p. 152. 

 Tripteronotus hautin, Lacep. v. p. 48. 

 Salmo lavaretus, £1. i. p. 163, taf. 25 (not L.). 



thymaUus latus, £1. i. p. 170, taf. 26. 



Coregonus oxyrhinchus, Kroyer, Damn. Fisk. p. 76 (with very bad 



figure). 

 oxyrhynchus, Ekstrom, Fische Morko, p. 198 ; "Cuv. ^ Val. xxi. 



p. 488, pi. 630 ; Selys-Longch. Fatme Beige, p. 222, and in Bull. 



Acad. Belg. ix. 1842, p. 510 ; Siebold, S'dssivasserf. p. 260. 



B. 9. D. 14. A. 14-15. L. lat. 75-81. L. transv. ^-=^. Vert. 58. 



The height of the body is one-fourth or two-ninths of the total 

 length ("without caudal), the length of the head two-ninths or one- 

 fifth. Snout produced, with the upper jaw protruding beyond the 

 lower, and produced into a fleshy cone in adult specimens. The 

 xnaxillary extends to below the adipose eyelid, or to the vertical from 

 the front margin of the eye, and its length is contained three times 

 and two-thirds or three times and three-fourths in that of the head. 

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

 limb of the praeoperculum is contained once and one-third or once 

 and one-fourth in that of the posterior. Back behind the head 

 moderately curved. Pectoral as long as the head, without snout. 



