RHADINICHTHVS PLANTI. 151 



in some cases feeble traces of the delicate vertical grooves seen in Bli. monensis are 

 visible just in front of the commencement of the longitudinal ridges. 



In the specimen from Crossford, presented by Mr. Dunlop to the Royal Scottish 

 Museum, the head is present, but not in good enough preservation for description. The 

 length of the entire specimen is 2 inches, but there must be some shortening up 

 between the shoulder and the dorsal fin, otherwise the length of the head would be 

 contained only a little over three times in the total. Some remains of the pectoral 

 fin are seen just where the head joins the body, consisting of rays which are distinctly 

 seen to be unjointed for a considerable distance. The dorsal fin seems here to 

 commence slightly more in front of the anal than in the type, but this is due to distor- 

 tion ; both of these fins are badly preserved. 



Observations. — Distinguished from the doubtful form Rh. angustulus, which 

 resembles it in scale-sculpture, by its long, narrow tail-pedicle. It is also a larger fish. 



Geological Position and Localities. — Coal Measures of Lanarkshire : Shotts ; 

 Crossford. 



13. Rhadinichthys Planti, Traquair. Plate XXXIII, figs. 9, 10. 



Ehadinichthts planti, Traqnair. Geol. Mag. (3), vol. iii, 1886, p. 441. 



— — J. Ward. Trans. ^. Staffs. Inst. Miuiug Eiigin., vol. x, 



1890, p. 177, pi. iv, fig. 6. 



— — A. S. Woodward. Cat. Foss. Fishes Brit. Mus., pt. ii, 



1891, p. 4G9. 



— — E. D. WeUburn. Proc. Yorks. Geol. and Pulyt. Soc, 



vol. xiv, 1901, pp. 168 aud 174. 



Specific Characters. — A small species attaining a length of over 2 inches; form 

 slender; ethmoidal region of skull forming a considerable prominence over the mouth ; 

 dorsal fin situated exactly opposite the anal; cranial roof-bones ornamented with com- 

 paratively coarse flattened ridges. 



Description. — The most perfect specimen I have seen (PI. XXXIII, fig. 9) measures 

 2^ inches in length by ^o '" greatest depth ; its shape is, therefore, elegant and slender. 

 The head measures y2 i"ch in length, and is contained nearly five times in the total ; 

 the dorsal fin 1 J inches behind the tip of the snout, and the lower lobe of the caudal 

 If inches behind the same point, the anal being exactly opposite the dorsal. The pectorals 

 are not exhibited in any specimen I have seen, but traces of a ventral are seen in one 

 case midway between the anal and the shoulder-girdle. 



The head (Text-fig. S), shows a peculiarly large development of snout forming a 

 considerable bluntly pointed prominence over the mouth. The cranial roof-bones are 

 ornamented with incised furrows, producing a comparatively coarse flattened ridging 



