3o6 Susanna Phelps Gage 



PI.ATE II. 



Fig. 3-5. Reconstructions of brain of adult dieniyctylus, male, 9 cm. 

 long. X about 17. (cf. PI. VI). Interrupted lines indicate the extent of 

 the cavities ; coarse dots, cinerea which appears on a natural surface. 

 Cinerea is seen on all sides of the olfactory lobes. 



Fig. 3. Ventral view. Cinerea marks out the extent of the terma, 

 a few cells passing ventrad of the cerebral commissure to the chiasma, 

 and is coextensive on the surface with the cavity of the infundibulum 

 which is partly covered by the hypophysis. The ganglia at the left 

 nearly touch. The 8th nerve is more ventral than the 7th and does not 

 extend so far caudad. The rings on the 2d, 3d, and 4th indicate the 

 foramens of the skull through which they pass. The geminums are 

 scarcely visible. 



Fig. 4. Dorsal view. Cinerea covers the habenas, the tip of the in- 

 fundibulum seen ventrad of the 3d, the dorsal side of the epencephal, 

 with a mere trace at the side of the metaplexus, and at the caudal end 

 of the geminums. The habense are at a lower level than the cerebrum 

 and the relative position of supraplexus, including the paraphysis, the 

 epiphysis and postcommissure is shown, and the metapore is indicated. 



Fig. 5. In the cerebrum the relation of the paracoele to the porta and 

 paraphysis is sho.wn, and in the metaplexus the lateral cavities. The 

 saccus appears caudad of the cinerea of the infundibulum. The two 

 origins of the ist nerve are indicated by dots in concentric lines, of the 

 other nerves by white. The origins of the 7th and 8th are connected and 

 a branch of the 7th passes the union dorsad of the 5th toward the gasse- 

 rian ganglion. 



Fig. 6. Mesal view of same. X about 29 The lines at the dorsal and 

 ventral side with the numbers indicate corresponding figures of Plate 



III, the lines at the right and left, the corresponding figures of Plate 



IV. A portion of the intermaxillary gland is shown ; the pigmented 

 dura with folds surrounding the paraphysis and supraplexus and par- 

 tially separating the hypophysis from the infundibulum; the arachnoid 

 filling the spaces between dura and pia especially in the space between 

 hemicerebrums ; the pia with vessels extending over mesal face of the 

 cerebrum, and interrupted with the endyma to form the metapore ; the 

 broad cut surface of the geminums ; the sulci indicated by deeper shad- 

 ing of the cavities ; the opening of the paraphysis between the auli- and 

 diaplexus ; the oblique porta ; the callosum and precommissure with no 

 cinerea intervening ; and cinerea cephalad of the terma, marking the 

 caudal progress of the latter (p. 282). 



Fig. 7. A nearly mesal section from a sagittal series of adult dieniyc- 

 tylus' brain, hardened by Golgi's method, and showing the relations of 

 the blood vessels with marked distinctness. X 27. Shows vessels of 

 the supraplexus passing caudad of the paraphysis to the diaplexiis ; 

 cephalad, to the auliplexus with its caudal extension into the diacoele, 

 and also to the intercerebral pia with a loop to the crista. 



Fig. 8. Transection of brain of half-grown red dieniyctylus in region 

 between 27 and 28 of Fig. 6. X 65. Shows the endolymphatic sac con- 

 necting by its duct with the ear, the blood vessels surrounding it within 

 the dura ; the mesocoele at its caudal end wider than in the adult (Fig. 

 26), narrower than the larva (Fig. 8^) ; the relations of the 7th and 8th 



