556 GEOEGIXA SWEET. 



of degeneration in Talpa is also indicated by tlie fact tliat 

 tlie Meibomian glands connected with the eyelids arc still 

 functional though small, indicating that the closing over of 

 the lids is but recent [6\ p. 26]. Although Scalops is 

 undoubtedly '"' much more degenerate in all its parts" than 

 Talpa [8, p. 361], Notoi'yctes leaves Scalops far behind in 

 this matter. 



Bloodvessels. 



The arteries supplying the eye region are very large in 

 proportion to the size of the eyeball, to cope no doubt with 

 the demands of the large lachrynial glands. They are 

 derived as usual from the external carotid and facial arteries, 

 with a twig from the internal carotid artery entering among 

 the muscles at the apex of the conical capsule. As pre- 

 viously stated the large vein empties itself into the facial 

 vein. 



Nerves. 



The second or optic nerve is discussed in connection with 

 the eyeball itself. 



Of the third or motor oculi, and fourth or trochlear nerves, 

 I can find absolutely no trace in any specimen, either in 

 connection with the eye or the brain. 



The sixth or abducens is equally wanting, though in one 

 animal there was to bo seen extending' throuu'ii some two or 

 three transverse sections (of the whole head) a slight swell- 

 ing on the ventral surface of tlio medulla oblongata, near the 

 middle line, just where one might expect to find the abducens 

 leaving the brain, though 1 could find no sign in its structure 

 of its being the root of a nerve. 



The gland mass receives its innervation from a branch of 

 the ophthalmic nerve, which it leaves in company with the 

 nasal branch of that nerve, again proving the relationship of 

 this gland with the lachrymal gland of the other forms. 



The muscles, now no longer accessory optic structures, 



