LOCATION OF THE SACCVLUS IN FISHES. 



27 



bone, and that of the sacculi was indicated by two slight swellings. 

 The lapilli were picked out of their respective cavities without 

 any cutting away of bone, but to get the sacculi and their 

 contents the bone had to be carefully cut away. 



Pirating a sp.?, a river Siluroid from British Guiana, where 

 it is called the " Lau Lau." It grows to a great size, even up to 

 seven feet. The site of the lapilli was shown by two bulges in 

 the bone of the skull; the site of the sacculi was likewise indicated 



Fig. IV. 



1. KUHLIA MARGINATA. 2. TREMATOMUS HANSONII. 3. BREGMACEROS 



MACCLELLANDII. i. AmPHISILE SCUTATA. 5. ElGENMANNIA VIRESCENS. 



6. aspredo sicuephorus. 7. nandus marmoratus. 8. lutjanus annularis. 



9. Elops satjrus. 10. Osteoglossum bicirrhosum. 11. Atherinichthys 



argentinense. 12. mur^enesox talabon. 



externally by slight prominences. The otoliths themselves were 

 small for the size of the fish. 



Doras maculatus, a freshwater Siluroid, called the "Bombom " 

 at Demerara. There were no external indications of sites of 

 otoliths. The lapilli are very small for the size of the fish. 

 Neither of the sagittse were found. 



Aspredo sicuephorus. 



Aspkedinid^. 

 Illustrated fig. IV., 6. 



