34 TRIASSIC FISHES AND PLANTS. 
This species is found much more abundant at Sunderland, Mass, 
~ than elsewhere. Probably more than half of the individuals which have 
been taken from the Triassic rocks there belong to it. A few individuals 
have been obtained from Durham and Boonton which were regarded by 
W. C. Redfield as specifically identical with these. Of this there may be 
some doubt, since nowhere else are fishes found which have the back so 
highly arched immediately behind the head, and set with the long, divergent, 
acute or clavate scales. 
The figures given on P]. V represent two old individuals and one very 
young one. Fig. 3 of Pl. VII represents a mature but not old individual. 
IscHYPTERUS FULTUS Ag. sp. 
PAV, ic: 22S Valerio al. 
Paleoniscus fultus Ag., Poiss. Foss., vol. 2, p. 43, Pl. VIII, Figs. 4, 5. 
Paleoniscus fultus W.C. R., Am. Jour. Sei., vol. 41, 1841, p. 20. 
Ischypterus fultus Egerton, Quart. Jour. Geol. Soc. London, vol. 3, 1847, p. 277. 
T'wo very imperfect fishes from Sunderland, Mass., both wanting the 
head and one the tail, served as a basis for Agassiz’s description of this 
species. All that can be said about them is that they represent one of the 
smaller and narrower species of the genus Ischypterus, as defined by Sir 
Philip Egerton. But no one could positively assert, even with the speci- 
mens in hand, that they belonged to one or another of several species found 
in the Connecticut Valley and New Jersey. We are, however, better in- 
formed in regard to the fish accepted by the Messrs. Redfield as represent- 
ing the species J. fultus. Mr. W. C. Redfield, in the article so frequently 
referred to,’ makes the following remarks upon this species: 
Paleeoniscus fultus Ag., the specimen figured by Professor Agassiz is destitute of 
the dorsal and head, as well as the upper portion of the body. The length was prob- 
ably four and a half inches; but this is often exceeded in other specimens. ‘The fins 
and their bony insertions appear stouter than in P. latus, but less stout than in some 
other species. Found at Westfield, Middlefield, and Durham, Conn., and Boonton, N. J. 
In the report read before the American Association of Geologists and 
Naturalists at New Haven, in 1845, by Mr. J. H. Redfield, I find the fol- 
lowing description of this species : 
Fish fusiform, head small, rather more than one-fifth of the whole length; back nearly 
straight, but slightly arched; scales of medium size, often with concentric strie, which 
a $$ 
1Am, Jour, Sci., vol, 41, p, 25. 
