1889 - 90 .] Dr Traquair on Fossil Dipnoi and Ganoidei. 395 
distortion is common to the greater number of those specimens as 
they occur in the rock. 
All the forms which I include under Elonichthys nemopterus are 
fishes of a tolerably deeply fusiform shape, with large fins, the dorsal 
and anal triangular, and high in front ; the fin rays longitudinally 
striated, save in some cases the proximal parts of those of the lower 
lobe of the caudal ; the principal rays of the pectoral articulated up 
to their origins. The scales are finely serrated on their posterior 
margins ; their ornament is delicately striato-punctate, as shown in 
my description and figures of those of the variety striolatus (Cart). 
Ganoids, Pal. Soc ., 1877); hut, as remarked above, there is an infinite 
variety in the relative extent of the striation and punctation. As 
a rule the most anterior scales are entirely striated ; those of the 
middle of the body striated towards the anterior margin and punctate 
posteriorly ; while those towards the tail become nearly smooth. 
The cranial roof bones are for the most part finely tuberculated ; those 
of the face striated, and very considerable variety occurs here as to 
the closeness and prominence of the striation. 
As well marked varieties I may retain the following : — 
a. E. nemopterus , Ag. type. — Fin-rays slender, rather distantly 
articulated, striated ornament prevalent on the scales. 
C.S., Wardie, Pumpherston. 
b. Yar. striolatus , Ag. — Fin-rays relatively coarser, very 
closely articulated , scales delicately striate-punctate. The 
Palceoniscus Robisoni of Hibbert and Agassiz ( Elonichthys 
Robisoni , Traq. olim) is doubtless the young of this variety. 
C.S., Burdiehouse, Burntisland, Pitcorthy. 
c. Yar. intermedins, Traq. — Like striolatus , but the transverse 
articulations of the median fin-rays not so close. C.S., 
Wardie, Burdiehouse, S. Queensferry, Pitcorthy, &c. 
This includes one of the two types of Agassiz’s Arnblyp- 
terus punctatus from Wardie. 
d. Yar. Dunsii , Traq. — Rays of the dorsal fin finely serrated 
posteriorly. C.S., Broxburn. 
e. Yar. tenuiserratus, Traq. — Scales with the external ornament 
very delicately marked, nearly smooth, posterior serration 
very fine. Sculpture of head bones strongly marked. Of 
all the forms enumerated above, this is the one I abandon 
