246 
SIRENOIDEI. 
The type species. Breadth of snout at anterior nares about 0'06 ; 
the inferior overturned margin very broad mesially, deeply notched 
by the narial openings laterally, flat, with few very coarse puncta- 
tions, and large tubercles upon its posterior edge. 
Form. Sf Log. Unknown. 
44627. Type specimen, incidentally mentioned under the name of 
Megalielithys hibberti by Agassiz, Poiss. Boss. vol. ii.pt. ii. 
p. 91 . History unknown. 
A smaller rostrum than the type specimen of G. woodwardi , with 
a narrower inferior overturned margin and without lateral narial 
excavations, is described as Ganorhynchus beecheri , J. S. Aewberry, 
Palseoz. Fishes A. America (Mon. U.S. Geol. Surv. no. xvi. 1889), 
p. 95, pi. xix. fig. 2. This fossil was obtained from the Chemung 
Group (Upper Devonian) of Warren, Pennsylvania, and is now in 
the Museum of Columbia College, iS’ew A^ork. • 
The following genera and species are also regarded by A. Fritsch 
as founded upon the dermal head-bones of Dipnoan fishes :—- 
Gompholepis panderi, J. Barrande, Syst. Silur. Boherne, vol. i. 
suppl. i. (1872), p. 644, pi. xxviii. figs. 1-3; A. Fritsch, Fauna der 
Gaskohle, vol. ii. (1888), p. 87, fig. 166, woodc.—Upper Silurian 
(Stage G- g 1); Chotec, Bohemia. [Itoyal Bohemian Museum, 
Prague.] 
Dipnoites perneri, A. Fritsch, Fauna der Gaskohle, vol. ii. (1888), 
p. 86, fig. 163, woodc.—Upper Silurian (Stage 6 g 3 ) ; Hlubocep. 
near Prague. [Royal Bohemian Museum.] 
Family PHANEROPLEURIDzE. 
Cranial roof-bones numerous ; margin of mouth, above and below, 
provided with a series of conical teeth ; jugular plates present. 
Caudal fin diphycercal. Scales cycloid. 
Synopsis of Genera. 
Anal fin separate. Phaneropleuron (p. 24/). 
Anal fin continuous with caudal . Z/ronemus 1 (p. 249). 
1 Since these pages were in type, Dr. E. H. Traquair (Proc. Eoy. Soc. Edinb. 
vol. xvii. 1890, p. 393) has expressed his opinion that Uronemus represents a 
distinct family, the Uronemidse. The upper dental plates are stated to be 
replaced by mere granulations, but no details are as yet forthcoming. 
