Anatomy of tJie Alligator. 283 



versity, which I have compared with my own results. I feel 

 indebted to him for having corrected an error in my former 

 paper on the Crocodile, in which I confounded the glutseus 

 minimus with the tensor femoris vagina3 muscle : this error 

 has been avoided in the present paper ; but I have adhered 

 steadily to the other supposed errors pointed out by Mr. Hair, 

 as he has failed to satisfy me that I am mistaken in my view 

 of the true relations and names of the pelvic bones of the 

 Alligator or Crocodile. 



In PI. X. fig. 1 is represented the pelvic arch of the Alli- 

 gator (left side), in which the parts, as named by me, are — 



Ischium Isch. 



Ilium II. 



Marsupiale m. 



Pubes 2^' 



These bones are named by other anatomists as follows : — 



Isch. -\- II. ilium. 



p ischium. 



m pubes. 



The weight of evidence is altogether in favour of the names 

 given by me, so far at least as the muscles are concerned, as 

 will appear to any comparative anatomist from the following 

 description, by which it appears that the usual origins are left 

 to all the muscles, and that no difficulty occurs with respect to 

 any muscle, except those named by me marsupiales (Nos. 44, 

 45), which would be called obturators by those who take a 

 different view of the pelvic bones. On the other hand, however, 

 such anatomists would be required to explain why the ham- 

 sti-ing muscles should take origin from the ilium and not from 

 the tuber ischii, and why the pectineus should arise from the 

 anterior border of the ischium rather than from its classical 

 origin on the pectineal line of the pubes. 



Such questions, however, relate to transcendental anatomy, 

 with which at present we have no concern ; and I hope the 

 description here given of the muscles, with their weights, 

 origins, and insertions, will be sufficient to enable any other 

 anatomist to recognize them readily. 



I. Muscles of the Hind Limb. 



1. Sartorius. 0*34 oz. av. 0. from the anterior spine of 

 the ilium. I. into the fascia of the inner side of the thigh, 

 halfway down. 



21* 



