: centra, both amphiccel ; pase) alecoms 
The Lysopteri, one family, the Palzoniscide, i 
1018 General Notes. 
CROSSOPTERYGIA. 
A. Dorsal baseosts present. 
Dermal rays (actinotrichia, Ryder) more nu- 
merous than baseosts ; each axonost RAAE TA: a 
with a neural spine .  Haplishat 
ermal rays sie in number with, and articu- 
lating with baseosts ; ; ; Taxistia, 
AA. No dorsal baseosts. 
Dermal rays equal in number with, and articu- 
lating with basilars ; axonosts not articulating with Hh 
neural spines; ‘ : i i ‘ . . » Cada 
ACTINOPTERYGIA, 7 
I. Dermal radii more numerous (octinotrichia) oe 
than the baseosts and axia 
Intercentra distinct, gaali- . tt 
II. Dermal radii equal baseosts and axonosts. 
Vertebrz with distinct intercentra on the chorda 
dorsalis ; . Me BS 
Vertebra with completed intercentra, ` which are 
amphiccel or annular ; -  Tsospondjë. 
Vertebræ with completed intercentra, which are 
opisthocce 
Ve rtebeeal column with i completed intercentra and A 
The other ord f the Actinopt ia anid those of the Po 
er orders of the Actinopteryg athe conta 
tia, the a 
Phaneropleuridæ (Zittel does not at this mily Oi 
been supposed). The Taristia, two, the Lye" 5 
anid Glyptodipterini, which should be called th s 
and the Osteolepididæ. The C/adıstia, one family, sbi 
tysomidæ is scarcely distinct. The Merospondytt em 
Sauropsidæ3 (= Microlepidoti and Cy clolepidoti, = 
Pycnodontide, with other families embracing more 
. cit. I endeavored (l. c.) to prove that the v ertical page 
anion: of Polypterus are basilars, but I do not now co onsider this ae 
* Cope, — fiakat, ist, 1880, pP. 440; Heterocerci Zittel, 1297» 
3 Pig eas : sabi ‘oc. Amer, . . Ady. Science, 1878, P - 298, 
$ 
