CARPENTER: DEVELOPMENT OF THE OCULOMOTOR NERVE. 209 



ninety-third and at the one-hundredth hour. By the end of the fifth 

 day, the transitory ganglia and the majority of the cells scattered along 

 the nerve have disappeared. 



Homologies of the Oculomotor and Abducent Nerves. A consideration 

 of the homologies of the third and sixth nerves does not lie within the 

 scope of this paper. Nevertheless, 1 have thought it well to reproduce 

 here from Fiirbringer (:02, p. 12-1) a concise summary of the various 

 interpretations given these nerves and their musculature. I have 

 slightly modified the arrangement. 



I. Oculomotor Nerve. 



1. Ventral-motor nerve (somatic musculature). 



a. Based on ontogeny : van Wijhe ("82), Beard ("85), Hoffmann 



("85, '94, '96, '97, '99. :00), His ('88), Martin ("90, motor 

 [sensory ?] root in addition), Dohrn ("90, represents in Tor- 

 pedo a multipiiun equivalent to from three to four, if not more, 

 spinal nerves, '91), Zimmermann ('91), Kolliker (96), Neal, 

 ('96, '98). 



b. Based on anatomy in adult: Bell ('30), Stannius ('49), Hux- 



ley ('74-75), Schneider ('79), Gashed ('86, '89), Strong (90) 

 Fiirbringer ('97), Wiedersheim ('98), Gaupp ('97-99). 



2. Ventral-motor nerve (visceral musculature). 



a. Based on ontogeny : von Kupffer ('94 ?, '95). 



b. Based on histology of eye muscles: Stannius ('51), Langerhans 



('73). 



3. Lateral-motor nerve (visceral musculature). 



a. Based on ontogeny : Balfour ('78), Marshall ('81, '82), Dohrn 

 ('85, '87), Houssay ('90), Hatschek ('92, probably descended 

 from the visceral constrictions), Sewertzoff ('98-99, not en- 

 tirely decided). 



4. Arising as a dorso-sensory or mixed (dorso-sensory and motor) nerve, 



with secondary reduction of the sensory component. 



a. Based on ontogeny: Marshall ('82), possibly Rabl ('89), Martin 



('90), Piatt ('91), Mitrophanow ('92, '93), Sedgwick ('94), 

 perhaps Sewertzoff ('98-99). 



b. Based on comparative anatomy : Schwalbe ('79, '81), Gaskell 



('89), [Haller ('98)]. 



II. Abducent Nerve. 



1. Ventral-motor nerve (somatic muscle). 



a. Based on ontogeny : van Wijhe ('82), Beard ('85), His ('88), 



Dohrn ^'88, '90, p. 314: represents in Torpedo a multiplnm 



equivalent to three or four motor spinal nerves), Martin ('90), 



Oppel ('90), Zimmermann ('91), Piatt ('91), Hatschek ('92, 



vOl. xlviii. — No. 2 14 



