140 THE ZOOLOGIST. 



being one of the Labyrinthici. The sacculus is enclosed in a bony 

 pocket that requires considerable cutting away to get it out. The 

 sagittse are large for the size of the fish (fig. I., 3). 



Embiotocid^;. 

 The sagittae in this family are underlaid by thin bone that 

 allows of their site being seen. They are large for the size of 

 the fish. The anterior end is free of bony covering, but the 

 posterior end goes back into a bony cavity that requires opening 

 up to free the lagena end of the sacculus. Of four specimens 

 examined, two came from Japan and two from the west coast of 

 the United States of America : Neoditrema ransonnettii and 

 Ditrema temminckii from the former country, and Cymatog aster 

 aggregatus and Hysterocarpas traski from the latter. 



Cichlidje. 

 In Cichlosoma bimaculatam (the " Patwa " of Demerara) and 

 in Crenicichla saxatilis (called the " Sun Fish " at Demerara) 

 there is no external indication of the site of the otoliths ; the 

 sacculus is embedded in a bony pocket, but requires only a little 

 cutting out. In Tilapia nilotica, a Nile fish, the sagitta is large 

 and much curved ; the sacculus required to be cut out. 



Labrid.e. 

 In Labrus maculatus * (the Ballan Wrass) and in L. mixtus 

 (the " Cook") there is no external evidence of the site of the 

 sacculi. From the inside the sacculus can be easily lifted out 

 from the shallow recess in which it lies. The sagitta is deeply 

 notched on both sides, so much so as to require tender handling 

 to prevent it splitting up longitudinally. 



CaRANGIDjE. 



Caranx trachurus (the "Scad," also called the "Horse 

 Mackerel ") has a well-defined bony pocket for its sacculus open 

 along the top for a short distance. At its lower end this pocket 

 has a constriction in it, but again expands to form a special 

 cavity for the lagena, which is well defined and contains a fairly 

 large asteriscus ; the sagitta t also is a fair size. Lichia amia, 

 a Mediterranean fish, has the sacculus in a long, trough-like, 



* See ' Zoologist,' 1910, p. 293, pi. I.. 12. f Ibid., pi. I., 7. 



