﻿238 SIUENOIDEI. 



42403. Upper aspect of head, much crushed and broken ; Kil- 

 minster, near Wick, Caithness. Peach Coll. 



P. 755. Large abraded cranial buckler, upper aspect, and two smaller 

 imperfect examples ; Orkney. Egerton Coll. 



P. 3373 a. Imperfect cranial buckler, upper aspect, showing con- 

 centric structure of the dermal plates ; Orkney. This is 

 the type specimen of Pohjphractus platycephalus, Agassiz, 

 op. cit. (1844) pi. xxvii. fig. 1. Ennish'dlen Coll. 



P. 546. Operculum figured as Polyphractus platycephalus by Agassiz, 

 ibid. pi. xxxi. fig. 5 ; Orkney. Egerton Coll. 



33166. Anterior portion of skull, showing palatine dental plates ; 

 Thurso. Purchased, 1857. 



42405. Eight palatine tooth attached to supporting bone ; Thurso. 



Peach Coll. 



42404. Mandible seen in horizontal section in hard rock ; Kil- 

 minster. Peach Coll. 



36007. Imperfect fish, 0*25 in length, with portions of the pectoral 

 and median fins ; Tynet Burn, Banffshire. 



Purchased, 1861. 



43270. Similar specimen, somewhat smaller, displaying large por- 

 tions of both pectoral fins ; Tynet Burn. Purchased, 1871. 



20686-87, 20689-90. Four specimens showing more or less of the 

 trunk and median fins ; Caithness. The fourth specimen 

 exhibits the two dorsal fins and a portion of the caudal, 

 well exposed, with the distally branching rays. 



Purchased, 1847. 



33149-52. Slab with portions of about six fishes, and four imperfect 

 larger individuals ; Thurso. Purchased, 1857. 



33172. Remains of anterior half of fish ; Holburn Head, Thurso. 



Purchased, 1857. 



42480. Nearly complete small fish ; Banniskirk, Caithness. 



Peach Coll. 



P. 618. Small fish showing median and paired fins, figured in 3Iur- 

 chison's ' Siluria/ ed. 3, p. 287, fig. 71, and by Huxley, 

 loc. cit. 1861, the figure being reproduced in the accom- 

 panying woodcut (fig. 38) ; Banniskirk. Egerton Coll. 



