ASTEROLEPIDJS. 
231 
gated, the outer margin with very large denticulations ; distal 
segment relatively slender, only slightly ornamented, about half as 
long as the proximal segment. Ornament consisting of vermi- 
culate anastomosing ridges, rarely distinctly nodose. 
A restoration of the dorsal aspect of this species is given in the 
accompanying woodcut, fig. 35. 
Form. Sf Loc . Upper Old Red Sandstone : Dura Den, Eifeshire. 
28121. Small slab with three individuals, imperfectly preserved, 
ventral aspect. Purchased , 1851. 
26121 a. Displaced anterior ventro-lateral plates, with bases of 
appendages, ventral aspect. The elements of the left 
side are shown, of the natural size, in PI. YI. fig. 9 : a 
portion of the bone is here broken away, displaying the 
transverse ridge (r) on the inner side of the anterior 
ventro-lateral, and showing no suture in this position. 
Purchased, 1851. 
Bothriolepis macrocephala (Egerton). 
18G2. Pterichthys macrocephalus, Sir P. Egerton, Quart. Journ. Geol. 
Soc. voL xviii. p. 103, pi. iii. figs. 7-9, woodc. figs. 1-3. 
1888. Bothriolepis macrocephalus, R. H. Traquair, Geol. Mag. [3j vol. v. 
p. 510, and Ann. Mag. Nat, Hist. [6] vol. ii. p. 501. 
Type. Imperfect individuals, dorsal and ventral aspect; British 
Museum. 
A variety or species, so far as known, merely differing from the 
typical B. hyclrophila in its much smaller size, the trunk only 
attaining an extreme length of 0-02. 
Form. Sf Loc. Dapper Old Red Sandstone : Earlow, Shropshire. 
P. 606. First of the type specimens, dorsal aspect, figured by 
Egerton, loc. cit. fig. 7 ; Church Quarry, Earlow. 
f Egerton Coll./^ 
fh Ct-y Ilk * v t t [ lXCl v tv-wet * - 
36442. Second type specimen, ventral aspect, wanting the head, 
figured loc. cit. fig. 8. Purchased , 1862. 
P. 195. Third type specimen, being an impression of the anterior 
ventro-lateral plates, with part of one appendage, figured 
loc. cit. fig, 9. _ Weaver-Jones Coll. 
P (9t>. f>l• Wt*\ ^ 
P, 4599, Impression of anterior median dorsal plate. 
Enniskillen Coll, 
