16 The Ganoids 
scales are highly developed. A second species, Dorypterus 
althaust, also from the German copper shales, has been described. 
This species has lower fins 
mant, but may be the adult 
Dorypterus is regarded by 
cialized offshoot from the 
many-rayed ventrals and the 
body and fins suggest affinity 
Dictyopygide.—In the Dic- 
d@), the body is gracefully 
pressed, the heterocercal tail 
turned upwards, the teeth 
hooked, and the bony plates 
this group two genera are 
taining numerous species. In 
terus Redfield, not of Agassiz) 
than Dorypterus hoff- 
of the same type. 
Woodward as a spe- 
Platysomide. The 
general form of the 
with the Lampride. 
tyopygide (Catoptert- 
elongate, less com- 
is short and abruptly 
are sharp and usually 
well developed. Of 
recognized, each con- 
Redfieldius (=Catop- 
the dorsal is inserted 
Fic. 4.—Dorypterus hoffmani Germar, restored. (After Hancock and Howse.) 
behind the anal, while in Dictyopyge this is not the case. Red- 
fieldius gracilis and other species are found in the Triassic of 
the Connecticut River. Dictyopyge macrura is found in the same 
region, and Dictyopyge catoptera and other species in Europe. 
