FALiEONISCIDUi. 
433 
Canobius politus, Traquair. 
1881. Canobius politus, R. PI. Traquair, Trans. Roy. Soc. Edinb. 
vol. xxx. p. 53, pi. y. %s. 14-16. 
1890. Mesopoma politum, R. H. Traquair, Ann. Mag. Nat. Hist. 161 
yoI. yi. p. 493. 
Type. Imperfect fish ; Geological Survey of Scotland. 
General form and proportions as in C. pulchellus. Cranial roof- 
bones ornamented with coarse rugae, more or less subdivided into 
elongated tubercles; facial hones striated. Scales very feebly 
ornamented with transverse, somewhat oblique ridges, in part 
terminating at the hinder border in denticulations; dorsal ridge- 
scales comparatively small. 
Form. § Log. Calciferous Sandstones (Cement-stone Group): 
Eskdale, Dumfriesshire. 
P. 4070. Two specimens. Purchased, 1883. 
Canobius macrocephaltis (Traquair). 
1890. Phadimchthys vnacrocephalus , R, H. Traquair, Rroc. Roy. Soc. 
Edinb. vol. xvii. p. 398. 
1890. Mesopoma macrocephalum , R. H. Traquair, Ann. Mag. Nat. Hist. 
[6] vol. vi. p. 493. 
Type. Fish ; collection of Dr. R. H. Traquair. 
Trunk comparatively slender, the head with opercular apparatus 
occupying somewhat less than one quarter of the total length. 
Head-bones striated, the striae upon the cranial roof being wavy 
and irregular, sometimes subdivided into tubercles. Scales feebly 
ornamented with oblique parallel ridges, terminating in denticu¬ 
lations at the hinder border; dorsal ridge-scales comparatively 
small. 
Form. <Sf Log. Calciferous Sandstones; Midlothian. 
41123. Specimen wanting the dorsal and pectoral fins ; locality 
unknown. Bryson Coll. 
Some doubtful fragmentary specimens from the Calciferous Sand¬ 
stones (Cement-stone Group) of Blackadder Water, near Dunse, 
Berwickshire, are named Canobius obscurus , R. H. Traquair, Trans. 
Roy. Soc. Edinb. vol. xxx. (1881), p. 68. [Geol. Survey of Scotland, 
Edinburgh.] 
2 F 
pabx ii. 
