﻿RHTZODONTIDiE. 



347 



the clavicle of each side is marked externally with fainter, 

 though almost equally coarse, reticulations. The last- 

 named bone in each case is imperfect superiorly, but the 

 lower expanded portion (PI. XII. fig. 6) is relatively 

 longer and narrower than the corresponding part of the 

 clavicle in E. hibberti (PL XII. fig. 3). No traces of the 

 pectoral fins are preserved, and most of the scales are 

 seen only from the inner side. Some scale-fragments 

 (PL XII. fig. 8), however, show that "the exposed area 

 of the external surface is marked with short, interrupted, 

 wavy, reticulating ridges, whose direction is mainly 

 parallel with the posterior border of the scale ; while in 

 the interval between these, more delicate ridges are seen 

 radiating from the centre " (Traquair). EnnisTcillen Coll. 



P. 363. Portion of dentary with teeth, associated with imperfect 

 scales. Purchased, 1881. 



P. 3320. Portion of dentary with teeth ; Burdiehouse. 



EnnisTcillen Coll. 



P. 3321. Left principal jugular plate and operculum, associated with 

 the infraclavicle of the right side. The operculum, with 

 its characteristic ornamentation, is shown, of the natural 

 size, in PL XII. fig. 5, and the infraclavicle, from the 

 inner aspect, in fig. 7. As remarked by Traquair, the 

 last-named bone has a relatively less antero-posterior 

 measurement than the corresponding element in R. hibberti. 



EnnisTcillen Coll. 



P. 332 2-a. Operculum associated with left infraclavicle and other 

 fragments ; also two imperfect detached opercula. 



EnnisTcillen Coll. 



36911-12. Operculum and (?) suboperculum. Purchased, 1863. 



47718. One of the principal jugular plates, in counterpart ; Calcife- 

 rous Sandstone, Burdiehouse, near Edinburgh. 



Presented by Dr. Lauder Lindsay, 1876. 



21223, 21421. Two small scales, inner aspect. Purchased, 1847. 



21975. Group of scales. Purchased, 1848. 



41125. Small scale, inner aspect. Bryson Coll. 



15533. Small scale, inner aspect ; Burdiehouse. Purchased. 



21223 a. Group of scales ; Burdiehouse. Purchased, 1847 '. 



