160 GANOID FISHES OF THE CARBONIFEROUS FORMATION. 



that genus. Re-examination of the case, however, makes me doubtful if my former 

 interpretation of it be correct. The specimen is distorted and fragmentary, and 

 though the fin in question is near the head, its connection with the shoulder-girdle is 

 not seen, and it has accordingly struck me that we have here to do, not with the 

 pectoral, but with the ventral fin. At all events, in the specimen represented in 

 PI. XXXV, fig. 5, we have distinct remains of the pectoral fin in the form of several 

 rays which are still unarticulated, though of considerable length. I may say, however, 

 that in no specimen which I have as yet seen, is there a satisfactory demonstration of the 

 structure of the pectoral fin. 



The ventral fin is also seldom well seen ; an exception to this rule is, however, met 

 with in the specimen represented in fig. 4, in which a well-developed ventral is seen, 

 with rays which are moderately closely articulated. The dorsal is placed far back, its 

 anterior commencement being only very slightly in front of that of the nearly opposed 

 anal. Both fins are of good size and expanse, triangular-acuminate, their rays delicate 

 with rather distant articulations, the joints being smooth or with one longitudinal 

 furrow. The caudal is powerful, deeply cleft, and inequilobate, the upper lobe being 

 nearly twice as long as the lower; its rays are delicate, smooth, dichotomising towards 

 their extremities, and divided by tolerably distant transverse articulations. The anterior 

 margins of all the fins are minutely fulcrated. 



Observations. — The characteristic features of the above-described interesting 

 Pal&eoniscid are so distinct and striking that we are fortunately free from any troublesome 

 doubts and questions as to species, for even although the scale-markings may show some 

 amount of individual variation as to their strength and sharpness, it is easy to pick out 

 even fragmentary remains of fusiformis and place them together as belonging to one 

 well-defined form. And after what I have said above regarding the pectoral fin, I con- 

 sider myself justified in removing the query with which I formerly qualified its position 

 in the genus Rhadinichthys. 



Geological Position and Locality. — Common in the fish-beds of Calciferous 

 Sandstone age near Glencartholm, Eskdale. 



18. Rhadinichthys (?) angustulus, Traquair. Plate XXXVI, figs. 1, 2. 



HuADiNicuTHYS (?) anoustulus, Traquair. Tnius. Koy. Soc. Edinb., vol. xxx, 



1881, p. 33, pi. ii, figs. 10, 11. 

 — A. 8. Woodward. Cat. Foss. Fishes Brit. Mus., 



pt. ii, 1891, p. 4G8. 



Specific Characters. — A fish of very small size; head proportionately large; tail- 

 pedicle deep ; scale-sculpture consisting of a few delicate, straight, non-bifurcating 

 transverse ridges. 



