Mr Dalglcish on Birds and Eggs from Central Uruguay. 77 



ichthys laticeps. Possibly its remains may include those of 

 Diplopterics Bohertsoni (Ag.), said to be also from Burdiehouse, 

 but as this is a mere MS. name, to the original of which there 

 is now no clue, it must be simply cancelled. 



Its remains are for the most part considerably smaller than 

 those of the coal-measure species, though patches of scales 

 occur showing that it sometimes attained a size nearly as great. 



The fact that this species, of Calciferous Sandstone age, 

 is distinct from any yet found in the Coal-measures, is in 

 accordance with the result of all my experience in the 

 domain of British carboniferous ichthyology ; namely, that 

 very few species of Ganoids are common to the strata above 

 and below the Millstone grit. As regards MegalicMhys, how- 

 ever, it must also be mentioned that its scattered remains are 

 also not uncommon in the estuarine beds of the Scottish 

 Carboniferous Limestone Series, but as yet I have seen no 

 specimens on which any secure determination of species can 

 be founded. 



Explanation of Plate IV. 



All the specimens figured are in the Edinburgh Museum of Science and 

 Art. 



Fig. 1. Megalidithys laticeps (Traq.), entire specimen, reduced : original, 

 lOf inches in length. Hugh Miller Collection. 



Fig. 2. Hinder extremity of another specimen, showing the second dorsal, 

 anal, and caudal fins : reduced one-half. 



Fig. 3. Head of another specimen showing the cranial buckler, maxilla, 

 and mandible : reduced more than one-fourth. Hugh Miller Collection, 



Fig. 4. Maxilla, from another head : natural size, Hugh Miller Collection. 



Fig, 5, Mandible, reduced, and placed upright to save space : original, 

 2| inches in length. 



Fig. 6. Principal jugular plate, reduced : original, 2^ inches in length. 



IV. Notes on a Second Collection of Birds and Eggs from 

 Central Uruguay. By John J. Dalgleish. 



(Read 19th March 1884,) 



Since my former notes on this subject were published in 

 the Proceedings of the Society,^ I have received from my cor- 

 1 Proc. Roy. Phys. Soc, vi., p. 232. 



