218 



by fine fibrous filaments supporting a plexus of vessels supplying the 

 labyrinth (Figs. 1 and 2). As has already been stated the posterior 

 vertical canal and the horizontal canal pass round cartilaginous pillars 

 which meet mutually to be attached to the outer wall of the capsule, — 

 the other ends of the pillars becoming continuous with the floor and 



ant. s. 

 canal 



horiz. s 

 canal 



ant. s. 

 post. s. canal 

 canal 



//.---' pillars 



.post. s. 

 canal 



, ^pillai's 



Fig. 1. 



Fig. 2. 



Fig. 1. Internal view of right ear of Orthagoriscus mola. The more jirominent 

 blood vessels are also shown. 



Fig. 2. External view of left ear of Orthagoriscus mola. The more prominent 

 blood vessels are also shown. 



the posterior wall respectively. Thus there is a wide upper foramen 

 for the posterior canal, a wide anterior foramen for the horizontal 

 canal, and posteriorly a common foramen for both these canals. The 

 Sun-fish therefore comes into line with the typical Teleostean con- 

 dition. 



I have nothing to add to the description of the general relations 

 of the parts of the auditory organ. An attempt to obtain histological 

 details only demonstrated the internal lining of flattened cells be- 

 coming columnar in the recessus and ampullae, and the external 

 fibrous layer containing the blood vessels and transmitting the nerves 

 to the ampullae and the reduced and conjoined utriculus and sacculus. 

 But it was some days after its capture before the specimen came into 

 my hands. 



Orbit. The eye as has often before been pointed out is large 

 — in the present case it measured 4 cm in diameter. It does not 

 seem to have been previously noticed that the optic nerve does not 

 emerge from the group of recti muscles, but in front of them, and 

 that the nerve is supported by a strong fibro-elastic band proceeding 

 from the closely set origins of these muscles. The ligament is inser- 

 ted into the sheath of the nerve just before the latter passes into the 

 eye (Fig. 3). A so-called nictitating membrane or third eyelid has been 



