f^. 



28 TELEOSTOMl. 



J. Body naked; snout spatulatc; mouth wide, without barbels; caudal 



with fulcra 1'olyoihjntid.k, 20. M 3-/ 



J J. Body with 5 series of bony shields; head with bony shields; 

 inoiitli inferior, toothless, preceded by 4 barbels; fins with fulcra. 



ACII'K.V.SEUID.K, 21. ^3/ 



77. Caudal rounded or lanceolate ; head with a bony ca.s<|ue. 



X. Scales ^^anoid (rlmnibic, enamelled plates); no gular |)late; fins with 



fulcra; dorsal tin short LErisosiEiu.K, 22. p-. ^j' 



XX. Scales c^-cloid ; a bony gular plate; no fulcra; dorsal lumj. 



AMiin.K, 23. '^ 3^ 

 HIT. Tail not evidently heterocercal (except in the very young). 

 y. Scales cycloid. 

 A'. Side of belly with a conspicuous ridRe or lateral line; pectoral fins 

 inserted liifjh, on or above the axis of the body; lower lol^ of 

 caudal lonj^est; lower pharyngeals united. . K.xihhktid.k, 42. ^. ^ I 

 KK. Edge of belly without conspicuous ridge or lateral line; i>ectoral 

 tins inserted usually below axis of body; lower pharyngeals 

 separate. 

 M. Vent before ventrals; eyes rudimentary. . Amblyop8ID.e, 36.^ J" 3. 

 3737. Vent behind ventrals; eyes nonnal. 

 N. Head more or less scaly. 



0. Upper jaw not protractile, its margin formed by maxillaries 

 posteriorly. 



7*. Teeth cardiform, unequal EsociDiK, 89. /*• 



PP. Teeth villiform, e(|ual U.mhrid.k, 38. ^. f 1. 



00. Upper jaw very protractile, its edge formed by premaxil- 



laries alone CypKiJioDo.NTiUiK, 37. a . S J 



yN. Head without scales. 



Q. Gill membranes united with the isthmus; lower pharyngeals 

 falciform; nu)uth toothless; anterior vertebr;v coalesced. 

 R. Pharj-ngeal teeth larger, in one or more rows, the main 

 row with less than 8 teeth; dorsal (in native species) 



with less than 10 rays Cypkiniu^., 26.)^' f ' 



BR. Pharyngeal teeth very numerous, in one row; dorsal rays 



ten or more Catostomid.k, 25. )v.t3 



QQ. Gill membranes free from the isthmus; lower pharyngeals 

 tiattish; anterior vertebra? not modified. 

 B. Lateral line present. 



T. Lower jaw with a gular plate; fins with scaly sheaths. 



EloI'ID.k, 29. fv lO . 

 TT. I>ower jaw without gular plate. 



U. Tongue with canine teeth; mouth terminal, oblique. 



Hi<)iM)>Tii).K, 27. |». t^ 

 UU. Tongue with blunt teeth; mouth inferior, horizontal. 



Alhluu.k, 28. B.I 0. 

 B8. T>atoral lino wanting. 



V. Mouth very wide, the maxillary reaching much beyond 



eye ; snout short. . ... Stoi.ki-iioiud.k, 31. ^. 1y. 



VV. Mouth mfxlorate, the maxillary scarcely extending 



beyond eye (^mi'KID.vi, 30. f • ' ' 



YY. Scales none; caudal with a long filament; snout long, tubular, ^ 



with the small mouth at the end Fl»TiLAKnu.»i 44- n.\ '■ 



