﻿ASTEROLEPID-E. 231 



gated, the outer margin with verj' large denticulations ; distal 

 segment relatively slender, only slightly ornamented, about half as 

 long as the proximal segment. Ornament consisting of verini- 

 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 Eed Sandstone : Dura Den, Fifeshire. 



26121. 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. VI. 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. Jo urn. 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. hydrophila in its much smaller size, the trunk only 

 attaining an extreme length of 0'02. 

 ' Form. &f Loc. Upper Old Red Sandstone : Farlow, Shropshire. 



P. 606. First of the type specimens, dorsal aspect, figured by 

 Egerton, loc. cit. fig. 7 ; Church Quarry, Farlow. 



Egerton Coll. 



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. 4599.. Impression of anterior median dorsal plate. 



Enniskillen Coll. 



