106 THE ZOOLOGIST. 



Lepidosteid^;. 

 Lepidosteus osseus (the Long-nosed Garpike of North America) 

 has a well-defined pocket for the sacculus at the side of the head, 

 The sagitta * in this fish is the largest otolith. 



Ceratodontid^:. 

 Neoceratodusfosteri, called the Burnett salmon, another name 

 being the Dawson salmon of Queensland, Australia. This, the 

 only living example known of this family, has no indication on 

 the lower side of the skull showing the location of the sacculus ; 

 but at the top of the skull two prominences show, when the skin 

 is taken off, that indicate the upper part of the vertical semi- 

 circular canals of the labyrinth. In the specimen examined 

 there were only four otoliths found, two on each side. An illus- 

 tration of them is given natural size (fig. I., 1, p. 107). The two 

 upper ones are from the right side of the head, the two lower 

 from the left. The lapillus is the upper one of each set, the 

 other being the sagitta. These otoliths are very chalky-looking 

 and not so porcelain-like as in teleostean fishes. The texture 

 can be compared in the photograph with those shown (fig. I., 3 



and 4). 



Lepidosikenid.^. 



The otolithic material in the head of Lepidosiren paradoxd is 

 in the shape of dust, otoconie. 



Elopid^e. 

 Megalops atlanticus (the Tarpon) has the sacculus lying in a 

 bony pocket fitting the sagitta closely, with a distinct pocket for 

 the lagena portion of it. The lagena itself is well developed and 

 holds a fair-sized asteriscus. The pocket for the sacculus is 

 open at the top. 



ALBULID.E. 



Albula conorhynchus, the specimen secured, came from Java; 

 the site of the sacculi is shown by two prominent swellings 

 under the basi-occiput. The sacculus is not embedded in a 

 bony pocket, the sagitta could be easily lifted out. It is large 

 for the size of the fish. 



* See ' Zoologist' vol. xiv., p. 294, pi. ii. f. 0. 



