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RAMSAY H. TRAQUAIR’S 
4 —Scales towards the tails, magnified six diameters. 
5.—Sketch of the bones of the head, enlarged 24 times. 
6.—Rhadinichthys delicatulus, Traquair ; natural size (p. 29). 
7.—Sketch of the head, enlarged 24 times. 
8.—Flank scales of the same, magnified six diameters. 
9.—Scales further back, magnified six diameters. 
. 10.—Rhadinichthys (2) angustulus, Traquair, magnified two diameters (p. 33). 
. 11.—Scales from another example of the same species, magnified six diameters. 
. 12.—Rhadinichthys Macconochii, Traquair; natural size (p. 30). 
. 13.—Seales from the nape of the neck in the same species, magnified six diameters. 
. 14.—Flank scales, magnified six diameters. 
15.—Scales further back, magnified six diameters. 
. 16.—Narrow ventral seales, magnified six diameters. 
17.—Cycloptychius concentricus, Traquair ; natural size (p. 37). 
18.—Scale from the back above the lateral line, magnified six diameters. 
19.—Flank scales of the same species, magnified six diameters. 
20.—Scales towards the caudal extremity, magnified six diameters. 
Puate III. 
1.—Rhadinichthys (?) fusiformis, Traquair ; natural size (p. 34). 
2.—Flank scales, magnified six diameters. 
3.—Flank Scales, from another specimen, magnified six diameters. 
4,—Narrow ventral scales, magnified six diameters. 
5.—Scales towards the tail, magnified six diameters. 
6. Phanerosteon mirabile, Traquair; natural size (p. 39). 
7.—Sketch of the head of P. mirabile; enlarged 24 times, 
8.—Tail-fin of another specimen, enlarged 24 times. 
9.—Holurus Parki, Traquair ; natural size (p. 44). 
. 10,—Flank scales of the same species, magnified six diameters. 
. 11.—Scales further back, magnified six diameters. 
. 12.—Median dorsal scales, magnified four diameters. 
. 13.—Holurus fulcratus, Traquair; natural size (p. 46). 
g. 14,—Median dorsal scales, magnified four diameters. 
ig. 15.—Holurus ischypterus, Traquair ; natural size (p. 66). 
g. 16.—Flank scales, magnified six diameters. 
Puate IV. 
1.—Rhadinichthys tuberculatus, Traquair; natural size (p. 31), 
2,—Flank scales, magnified six diameters. 
3.—Scales towards the caudal extremity, magnified six diameters. 
4.—Tarrasius problematius, Traquair; Tarras Foot, enlarged two diameters (p. 62). 
5.—Scales of the same specimen, magnified eight diameters, 
6.—Another specimen, probably referable to the same species, from Glencartholm; natural 
size (p. 63). 
PLatTE V, 
1.—Canobius Ramsayi, Traquair; natural size (p. 47). 
2.—Flank scale, magnified six diameters. 
3.—Scale further back, magnified six diameters. 
4.—Sketch of head of Canobius Ramsay’; magnified two diameters. 
5.—Canobius elegantulus, Traquair; natural size (p. 49). 
