58 RAMSAY H. TRAQUAIR’S 
portion of the anterior margin, as well as of the base, is visible. The rays, very 
short at first, become rapidly elongated; they are slender and tolerably distantly - 
articulated. A small portion of this fin is also seen in the second specimen, 
and here the presence of large and prominent fulcra along the anterior margin 
is very distinctly exhibited. 
The collection contains also a fragment of a tail, which has certainly belonged 
to the counterpart of the last named specimen, the parts between it and the head 
having been lost. This displays part of the upper lobe of the strongly hetero- 
cercal caudal fin, with the posterior fringe-like extremity of the dorsal fin, the 
latter stopping short at the pedicle. The scales of what remains of the tail pedicle, 
and of the caudal body-prolongation, display the nearlyobsolete remains of an 
ornamentation similar in character to that which occurs in those of the body. 
Remarks.—The rounded non-peaked form of the body, with the evidently 
much shorter dorsal fin, seems quite sufficient ground for erecting this remark- 
able new form into a genus distinct from Cheirodus. 
I have much pleasure in naming this species after Professor Geikie, to 
whom I am indebted, on this as on other occasions, for so much kind and 
friendly assistance. 3 
Geological Position and Locahty—Near Glencartholm, Eskdale, in the 
Cement-stone group of the Calciferous Sandstone series. 
Platysomus, Agassiz, 1835. 
Agassiz, “ Poissons Fossiles,” vol. ii. pt. 1; Young, Quar. Journ. Geol. Soc, 1866 ; Traquair, 
g q 
Trans. Roy. Soc. Edin. xxix, 1880, p. 368.) 
Platysomus superbus, sp. nov. Traquair. 
Pv 
Of several specimens of this splendid fish, one which is remarkably perfect 
may be selected for description. Its principal measurements are as follows :— 
From the tip of the snout to opposite the termination of 
the caudal lobe, . : . §6 inches. 
From the tip of the snout to the pitenehain of the caudal 
filly oy j ; : ; q ; : 5; ey aes 
From the tip of the snout to opposite commencement of 
attal fin) t) ; ; a ee 
From the tip of snout to fnncaie osiieneweenest of ven- 
tral fin, : : 24 -,, 
Greatest depth of the boas Es the diatnentoicenitent of the 
dorsal fin, at the highest pomt of the back, to the 
origin of the ventrals, ; fee}, 
