‘ 
Geology and Paleontology. 101 7 
the distal parts which directly support the true rays as actino- 
” ~ 
. 
“ese Modifications. They may be called superorders: 
a Dorsal, anal, pectoral, and ventral axonosts pres- 
‘ presented by a single element to each fin. Rhipidopterygia. 
T Dors 
ng with a single baseost, if any; the pectoral 
_ Xonosts present in variable number, articulating 
ay numerous well-developed baseosts; the ven- 
car gpa Single, articulating with numerous 
se . ; 5 ; ; a Crossopterygta. 
“inte and anal axonosts as in the last; no pec- 
aa  nonost, baseosts rudimental; a ventral axo- ae 
ore numerous baseosts ; 7 . Podopterygia.* 
sal and anal axonosts as in the last; pectoral 
ost none, baseosts very few, small; ventral _ des 
“onost Present, with minute or no baseosts; Actinopterygia. 
“i = orders and families of these superorders appear to the 
er to be as follows: 
: RHIPIDOPTERYGIA. ' 
“Sosts present in dorsal and anal fins ; . Rhipidistia. 
Da wanting to dorsal and anal fins. Caudal 
Spine (1 Present, each one articulating with a neural oe 
; (Huxley). : i : : g : j .  Actimsta? 
_ * Chondrostei, Owen, C , Olim. 
s Actinopteri, Cope, Aran 
Transac. Amer. Philosoph. Soc., 1870, pp- 450, 451. 
