12. THYMALLUS. 201 



a, h. Adult. River Tyne. Presented by T. A. Knight, Esq. 



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

 Collection. 



g. Half-grown : skLa. River Ure. From Mr. ParneU's Collection. 



h. Adult : skin. British. From Mr. YarreU's Collection. 



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

 Wheelwright's Collection. 



I-jn. Fine specimens. Gestrickland, Sweden. From Mr. Wheel- 

 wright's Collection. 



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



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



q. Adult : stuffed. Biel. From Mr. YarreU's CoUection. 



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



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

 CoUection. 



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



2. Thymallus gymnogaster. 



Thymalus gymnogaster, Cuv. i^- Val. xxi. p. •446, pi. 62(3. 

 L.lat. 100. Cfec. pyl. 17. 

 BeUy naked, otherwise very similar to Th. vulgaris. ( Val.) 

 Newa. 



3. Thymallus aeliani. 

 Thynialus seliani, Cuv. <§• 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 thymaUus, var. e Ko\7'ma et e Sob, Pallas, Zoogr. Ross,- As. iii. 



p. 366. 

 Thymalus pallasii, Cut). Sf Val. xxi. p. 448. 



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



S + iuinores 



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

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

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

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

 lobe, in a specimen lo| inches long. Dorsal fin with red lines, which 

 are interrupted by the shorter rays, but continuous and running 

 upwards on the membrane between the long rays. 



The rivers from which PaUas received this species, are named 

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

 BerUn Museum. 



5. Thymallus tricolor. 

 Cope, Proc. Acad. Nat. Sc. Philad. 1865, p. 80. 



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

 L. trans. 10/11. Ca3c. pyl. 22. 

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



