114 Journal of Comparative Neurology. 



c. The parafloccnlar sulci, one on each side, have appeared and the floccu- 

 lar sulcus now extends clear across the cerebellum. 



d. The paraflocculus is more obvious than the flocculus ; compare Figs. 

 10-14, PI- I- 



e. The tela, kilos, cestus, lateral Ubend, auditory region, caudal fold, 

 etc., are quite obvious. 



/. A part of the metatela has been removed to expose the metacoele. 

 g. The caudal extension of the mesencephal. 

 Fig. jg. Left lateral aspect of the same specimen. 



Figs. 60 and 61. Human embryo, No. 3209, 90 mm. long (x 6.7). 

 Fig. 60. Shows the dorsal aspect. A few new sulci have made their ap- 

 pearance, 



a. The furcal sulcus. 



b. The uvular sulcus. 



c. The nodular sulcus. 



The tela and plexus have been removed ; this exposes the cavities and other 

 features which otherwise could not be clearly shown; viz: 



1. The metaccele. 



2. The epicrele and paracoeles continuous with the metacoele. 



3. The lateral U-bend. 



4. The caudal fold. 



5. The auditory region. 



6. The mesal groove in the floor of the cavities. 



7. The preramus ; all of the organ caudad of the furcal sulcus constitutes 

 the postramus. 



Fig. 61. Shows the left lateral aspect of the same specimen and the begin- 

 ning of a small sulcus, which appears to be the peduncular sulcus. It divides 

 the pileum into two general regions, the prepileum the smaller of the two, and the 

 postpileum, which forms the greater part of the so-called lateral lobes of the 

 cerebellum. 



Figs. 62 and 6j. Cerebellum of a human embryo, male. No. 3347, 95 mm. 

 long (x 6.7). The growth of the mesal part is gaining upon that of the two 

 pilea. But there is a question whether or not the vermis is yet present. No 

 new sulci have appeared upon the dorso-caudal aspect but the ones already 

 there have a greater depth. The left parepicoele is represented as though a 

 part of the tela had been removed (it was badly torn in the dissection) to show 

 the structure of the plexus. It may properly be compared to a series of bunches 

 of grapes suspended from a strap-like support, the cestus. The metapore was 

 -artificially enlarged during the dissection. 



Fig. 6j. Shows the left lateral aspect of the same specimen. A few (two 

 are shown) new sulci have begun to form upon the cephalic aspect of the cere- 

 bellum. An opening into the parepicoele, the parepiplexus, and the torn edge 

 of the tela, are also shown. 



PLATE VII. 



Fig. 64. Mesal aspect of the cerebellum of a male human embryo. No 

 2084 (x 6.7), age and history unknown. Shows the division by the furcal sulcus 



