12. THYMALLUS. 201 



a, b. Adult. River Tyne. T'resented by T. A. Knight, Esq. 



c-f. Adult and half-grown : skins. Eiver Swale. From Mr. Parnell's 

 Collection. 



(/. Half-grown : skin, lliver TJre. From Mr. Parnell's Collection. 



7i. Adult : skin. British. From Mr. Yarrell's Collection. 



i, k. Several specimens, adult and half-grown. Lapland. From Mr. 

 Wheelwright's Collection. 



l^m. Fine specimens. Gestrickland, Sweden. From Mr. Wheel- 

 wright's Collection. 



n. Half-grown : skiji. From Gronow's Collection. 



o-p. Adult. Lake of Constance. From the Stuttgart Maseum. 



q. Adult : stuffed. Biel. From Mr. Yarrell's Collection. 



r. Half-gown. Danube, near Ulm. From the Stuttgart Museum. 



s-u. Half-grown. River Amper, Bavaria. From Dr. Gemminger's 

 Collection. 



v-x. Young. River Isar, Bavaria. From Dr. Gemminger's Collection. 



2. Thymallus gymnogaster. 



Thymalus gymnogaster, Cuv. t^ Val. xxi. p. 440, pi. 026. 

 L.lat. 100. Cajc. pyL 17. 

 Belly naked, otherwise very similar to Th. vulgaiis. ( Val.) 

 Newa. 



3. Thymallus seliani. 

 Thymalus seliani, Ctiv. 8f Val. xxi. p. 447. 



D. 17. A. 12. P. 15 V. 9, L. lat. 84. 

 Appears to differ from Th. vulgaris by the shortness of the dorsal 

 fin. {Val.) 



Lago Maggiore. 



4. Thymallus pallasii. 



Salmo thymallus, var. e Kovyma et e Sob, Pallas, Zoogr. Ross.- As. iii. 



p. 300. 

 Thymalus pallasii, Cuv. 8f Val. xxi. p. 448. 



D. 21. A. 12. P. 16. V. 11. L.lat. 99. L. transv. -—? . 



S + miuores 



The length of the head is contained five times and a half in the 

 total (without caudal) ; the maxillary extends to the vertical from 

 the front margin of the eye. The anterior dorsal rays are subcqual 

 in length ; but the six posterior are much produced, forming a broad 

 lobe, in a specimen 15^ inches long. Dorsal fin with red lines, Avhich 

 are interrupted by the shorter rays, but continuous and running 

 upwards on the membrane between the long rays. 



The rivers from which Pallas received this species, are named 

 Kovyma and Sob by him. One of the tyjiicul specimens is in the 

 Berlin Museum. 



5. Thymallus tricolor. 



Cope, Proc. Acad. Nat. Sc. Philad. 1866, p. 80. 



B. 8. D. 21. A. 13. V. 10. P. 16. L. lat. 95-98. 

 L. trans. 10/11 . Cffic. pyl. 22. 



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



