234 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
et se devise en deux parties (Pl. XIV. Fig. 8) dont les fibres sortent du 
cerveau en formant différents coins et se croisent ensuite au dedans du 
ganglion Gasseri; de cette maniére le ramus ophthalmicus profundus les 
reçoit de la partie postérieure; le ramus maxillaris, de la postérieure et 
de l’antérieure ; le ramus mandibularis, principalement de la postérieure.” 
Mitrophanow’s results are seen to differ markedly from mine as to the 
relationship of the fibres of the ramus mandibularis. My results, how- 
ever, agree with those of His (’88°, p. 365, Tab. II, Fig. 3) for the human 
Doh. s V rx.may.. 
Virx. min. gn fac. 
: . Y / 
11. VI Lopt.su. 
: N gnmsece. 
mu.ob.su È f 
V.opt.su, Vopt.p'fad 
snutt Stee 
Fıcure K, 
embryo. The clear relationship of the motor fibres of the trigeminus’ 
with encephalomere III and the visceral part of van Wijhe’s second cavity 
appears to me a matter of considerable morphological importance, and 
seems to establish the metameric relations of these elements. 
Fie. K. Parasagittal section through the left side of a Squalus embryo of 
19-20 mm. X 50. 
IT, III, IV, second, third, and fourth encephalomeres; V. md., r. mandibularis 
trig.; V. mx., r. maxillaris trig.; V. opt. p?fnd., r. ophth. profundus trig.; V. opt. su., 
r. ophth. superficialis trig.; V. rx. maj. and V. rx. min., major and minor roots of the 
trigeminus; VII. ac., r. acustico-facialis; VII. buc., r. buccalis facialis ; VIT. hoi., 
r. hyoideus facialis; VII. opt. su., r. ophth. superficialis facialis ; gn. fac., ganglion of 
the facialis nerve; gn. ms-ce., meso-cephalic ganglion still retaining connection with 
the ectoderm by the process x; mu. ob. su., m. obliquus superior; mu. rt. su. + a., 
musc. recti superior and anterior (1st cavity); treh., trochlearis. 
