RHIZODOXTIDJE. 
353 
P. 5136. Two teeth ; Xewsham. 
Presented by William Dinning, Esq., 1886. 
P. 785, P. 792. Two teeth; Longton, Staffordshire. Egerton Coll. 
P. 3269. Tooth ; Longton. Enniskillen Coll. 
Strepsodus portlocki (Portlock). 
1843. Holoptychius portlockii, J. E. Portlock (ex Agassiz, MS.), Rep. 
Cieol. Londond. p. 464, pi. xiii. figs. 1-9. 
1844. Holoptychius portlockii , L. Ag'assiz, Poiss. Foss. vol. i. p. xxxvi 
(name only). 
1855. Rhizodus hibberti ?, F. M‘Coy, Brit. Palgeoz. Foss. p. 613. 
1878. Archichthys portlockii, R. H. Traquair, Proc. Roy. Soc. Edinb. 
yol. ix, p. 657. 
1881. Archichthys portlockii, R. H. Traquair, Trans. Roy. Soc. Edinb. 
yol. XXX. p. 18. 
188b. Rhizodus portlockii , R. Etheridge, Foss. Brit. Islands, pt. i. p. 341. 
1890. Archichthys portlocki, R. H. Traquair, Proc. Roy. Soc. Edinb. 
yoI. xvii. p. 389. 
Type. Teeth and scales; Museum of Practical Geology. 
Teeth closely similar to those of S. suleidens, but apparently shorter 
and broader and without vertically-elongated depressions above the 
basal furrowed portion. 
Form. Sf Loc. Lower Carboniferous : Derry, Tyrone, Fermanagh, 
and Antrim, H. Ireland. Calciferous Sandstones: Liddesdale, 
Dumfriesshire ; Pittenween and Abden, Fifeshire. 
P. 725. Imperfect small scales ; Maghera, Co. Derry. 
Egerton Coll. 
P. 4580. Remains of larger scales; Maghera. Enniskillen Coll. 
P. 4596. Group of similar scales ; Ballynascreen, Derry. 
Enniskillen Coll. 
Strepsodus hardingi (Dawson). 
1868. Rhizodus hardingi , J. A . Dawson, Acadian Geoloo’Yi ed 2 
p. 254, fig. 77 a-d. ’ 
1890. Strepsodus, A. 8. "Woodward, Geol. Mag. [3] vol. vii. p. 457. 
dfoo. O. /^//«£/, x XX( ' x . 
T ype. Fiagment of mandible and tooth ; Peter Redpath Museum 
Montreal. ' * 
Teeth much laterally compressed, sometimes facetted, slightly 
curved, with slender apex ; fine striations distally on the concave 
side, but extending round the plicated basal portion. 
PART II. 2 A 
