RHIZODONTID^l. 
365 
thickly set with fine conical or rounded granules, generally without 
linear arrangement.'*’ 
The type species of this genus is S. taylori , J. Hall, Nat. Hist. 
New York, pt. iv. Geology, 1843, p. 282, woodc. fig. 130 
(further noticed by J. S. Newberry, Palaeoz. Fishes N. America" 
1889, p. 112), founded upon portions of a fish from the Catskill 
Group of Blossburgh, Pennsylvania, now in the American Museum 
of Natural History, New York. A personal examination of the 
original specimen has convinced-the present writer (Geol. Mag. [3] 
vol. vii. 1890, p. 392) that the arrangement of the cartilages in the 
obtusely lobate pectoral fin and the structure of the teeth suffice to 
determine the Rhizodont character of the fish. It may also be 
added that the writer did not observe the external tubercular scale- 
ornament noted by Newberry, while the reticulated markings sug¬ 
gested to him the corresponding ornamentation on the exposed 
portion of the scales of JStrepsodus (see PI. XY. fig. 1). 
The two following species are only provisionally placed here 
until the discovery of more satisfactory specimens. 
Sauripterus favosus (Agassiz). 
1844. Glyptosteus favosus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 179 
(name only). 
1844. Bothriolepis favosa, L. Agassiz, Poiss. Foss. V. G. H. pp. 61, 
100, pi. xxvii. fig. 7, pi. xxviii. figs. 12, 13. 
i860. Bendrodus favosus, E. von Eichwald, Leth. Rossica, vol. i. 
p. 1561 (in part). 
1888. Cricodus (?) favosus, R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 515. 
1890. Cricodus (?) favosus, Woodward & Sherborn, Cat. Brit. Foss. 
Vertebrata, p. 48. 
Type. Portions of jaws; unknown. 
Laniary teeth much compressed, very broad at the base, tapering 
to a slender, faintly recurved apex. External surface of mandible 
coarsely tuberculated ; some of the head-bones more finely marked, 
the granulations tending towards arrangement in series. [Scales 
and vertebrae unknown.] 
The known examples of the jaws of this species are about 0'25 
in length, and a typical laniary tooth measures 0*015 in height. 
The fragmentary plates from the Russian Old Red Sandstone, 
theoretically associated with the above by Agassiz and Eichwald, 
are too imperfect for determination. 
Form. Sf Loc. Upper Old Red Sandstone: Perthshire and Elgin. 
