230 
AXTIARCHA, 
Botliriolepis hydrophila (Agassiz). 
[Plate YI. fig. 9.] 
1844. Pamphractus hydroplnlus , L, Agassiz, Poiss. Foss. V. G. R. 
pp. 5, 21, pi. iv. figs. 4-7. 
1844. Pamphractus andersoni , L. Agassiz, ibid. p. 21. 
1845. Homothoraxflemingii, L. Agassiz, ibid . p. 134, pi. xxxi. fig. 6. 
1848. Pterichthys hydrophilus, H. Miller & Sir P. Egerton, Quart, 
Journ. Geol. Soc. vol. iv. pp. 312, 314. 
1859. Pamphractus undersoni= Pterichthys hydrophilus , J. Anderson, 
Dura Den, pp. 49, 52, pi. i. fig. 1. 
1862. Pterichthys hydrophilus , J, PoTvrie, Quart. Journ, Geol. Soc, 
vol. xviii. p, 435. 
1888. Botliriolepis hydrophilus, R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 510, and Ann. Mag. Nat, Hist. [6] vol. ii, p, 500, pi. xviii. 
figs, 4, 5. 
Type. Imperfect individuals, dorsal aspect; Museum of Practical 
Geolog}'. 
A small species, the head and trunk attaining a length of about 
Fig. 35. 
Bothriolepis hydrophila (Ag.).—Dorsal aspect, restored by R. H. Traquair. 
a., anconeal; a.rn.d., anterior median dorsal; a.d.L, anterior dorso-lateral; 
ar., articular; m., marginal; p.d.L, posterior dorso-lateral; p.m.d., pos¬ 
terior median dorsal. 
0'08-0’09. Form of head, trunk, and dorsal plates as in B. cana¬ 
densis . Proximal segment of pectoral appendages broad, but elon- 
