John Warren 9 
then passes through the paraphysis at a point where two small tubules are 
given off, then through the telencephalic plexus, Tel. Plx., the telen- 
Fic. 12. Embryo of 26 mm. Harvard Embryological Collection, Trans- 
verse Series, No. 376, Section 89, X 63 diams. (See line A-B, Fig. 11.) 
cephalon, V'el., the lateral ventricles, 1. V., and the foramina of Munro, 
Ff. M. In this section the plexuses of the hemispheres, L. Pla., are seen. 
They arise on either side of the origin of the telencephalic plexus, and 
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Jf “pf 
ro 
é 
A 
( ~ 
: XQ 
Fic. 18. Embryo of 26 mm. Harvard Embryological Collection, Frontal 
Series, No. 378, Section 188, X 63 diams. (See line C-D, Fig. 11.) 
oT 
pass outward at right angles to it through the foramina of Munro into the 
lateral ventricles. 
Fig. 13 is a frontal section age an embryo of 26 mm., corresponding 
