ELONICIITHYS PORrLOCKI. 73 



both in iiaving the posterior margin of the body-scales finely denticulated, as well as in 

 other matters of detail. 



Geological Position and Locality. — Only known from the Lower Carboniferous rocks 

 of Glenciu-tholm, Dumfriesshire. The type specimen is in the collection of the 

 Geological Survey of Scotland ; the one here figured is in the cabinet of the author. 



7. Elonichthys Portlocki, Egerton. Plate XVIII, figs. 4—7. 



Ambltptebus Poetlocki, Egerton. Quart. Journ. Geol. Soc, vol. vi, p. 2, 



1850. 

 Elonichthys Portlockii, Traquair. Ibid., vol. xxxiii, p. 553, 1877. 



— ? Poetlocki, A. S. Woodward. Cat. Fossil Pishes Brit. Mus., pt. ii, 



1891, p. 499. 



Specific Characters. — Scales striated by tolerably fine oblique ridges ; principal rays 

 of pectoral fin articulated up to near their origins. 



Description. — Unfortunately very little description can be given of this species, as } 

 have only seen a few fragments belonging to the Egerton Collection in the British 

 Museum. The best of these is represented in PI. XVIII, fig. 4, and consists of 

 little more than the ventral nuirgin, including the pectoral fin in front and the anal 

 behind ; a portion of the shoulder-girdle is seen, but there is no head. A typical scale 

 (figs. 6 and 7) is quadrate, and having the exposed area sculptured with tolerably 

 fine closely set ridges, which pass diagonally across the surface from above downwards 

 and backwards, and occasionally bifurcate or are intercalated. The pectoral fin is of 

 moderate size, its principal rays being articulated nearly up to their origins ; the anal i* 

 of the usual triangular acuminate form, the joints of its rays being longer than broad 

 and finely longitudinally striated. No other fins are visible. Fig. 5 represents a portion 

 of a badly preserved head referred to by Sir Philip Egerton in the paper quoted above. 

 The jaws are here seen to be closely and delicately striated, the arrangement of the 

 ridges being similar to that in allied species, e.g. E. Robisoni. Such of the teeth as 

 are seen are conical and sharp, but none of any considerable size are exhibited. 



Observations. — The articulation of the principal rays of the pectoral fin up to near 

 their origin prevents this species from being mistaken for E. Aitkeni, and the ridges on 

 the scales are also finer, and in all cases ol)lique in their direction. I own I do not quite 

 understand Sir Philip Egerton's statcMuent that th(; scales are " very thick," and that 

 their ridges are "fewer in num'uer and coarser than in any otlier Amblgptei'us," though 

 of course E. Aitkeni was not known at the time he wrote. 



Geological Position and Localities. — In the Lower Carboniferous rocks of Maghera 

 and Movheeland in the north of Ireland. The type specimens, including those here 

 ligured, are in the British Museum. 



