444 CLASSIFICATION OF DEVONIAN FISHES 
Suporpo III.—CrossopTeryvGip&—Continued. 
Fam. 3.—GLYPTODIPTERINI. 
Dorsal fins two ; scales rhomboidal or cycloidal, sculptured ; pectoral fins acutely 
Jobate; dentition dendrodont. 
Sub-fam. A. with rhomboidal scales. 
Glyptolemus, Glyptopomus, Gyroptychius. 
Sub-fam. B. with cycloidal scales. 
FLoloptychius, Glyptolepis, Platygnathus [Rhisodus, Dendrodus, Cricodus, 
Lamnodus), 
Fam. 4.—CTENODODIPTERINI. 
Dorsal fins two ; scales cycloidal ; pectorals and ventrals acutely lobate ; dentition 
ctenodont. 
Dipterus, (Ceratodus? Tristichopterus ?). 
Fam. 5.—PHANEROPLEURINI. 
Dorsal fin single, very long, not subdivided, supported by many interspinous bones ; 
scales thin, cycloidal ; teeth conical; ventral fins very long, acutely lobate. 
Phaneropleuron. 
Fam. 6.—C@LACANTHINI, 
Dorsal fins two, each supported by a single interspinous bone; scales cycloidal ; 
paired fins obtusely lobate ; air bladder ossified. 
Celacanthus, Undina, Macrcpoma. 
SuporDo IV.—CHONDROSTEID.£. 
SuBORDO V.—ACANTHODID.£. 
Considering the Ganoidei, as defined by Miiller, to form an order 
of the class Pzsces, and adopting the four groups typified by Asmza 
Lepidosteus, Accipenser and Acanthodes, respectively, as sub- 
orders, without thereby prejudicing the question as to whether other 
suborders may not be required, I propose to establish another and 
equivalent group, or suborder, to comprise the existing Polypterus 
and all those extinct Ganoids which, like it, fall within the range 
of the following definition :— 
Dorsal fins two, or, if single, multifid or very long ; the pectoral 
and usually the ventral fins, lobate ; no branchiostegal rays, but two 
principal, with sometimes lateral and median, jugular plates, situated 
between the rami of the mandible; caudal fin diphycercal, or hetero- 
cercal ; scales cycloid or rhomboid, smooth or sculptured. 
On the suborder thus defined I propose to confer the title of 
CROSSOPTERYGID.¥,! in consideration of the peculiar manner in which 
the fin rays of the paired fins are arranged, so as to form a fringe 
round a central lobe, which constitute so marked a character of all 
the genera belonging to the group at present known. 
1 gposowrds, mrépvt, ‘fringed fin.” ‘* Crossotopterygid ’’ would perhaps be more 
correct, but the shorter compound is preferable. 
