WILLIAMS: MIGKATION OF EYE IN PSEUDOPLEUEONECTES. 57 



pt-pal. {dx., s.) 



rec. orb. 



trb. su'orb. s. a. 



Pterygopalatine 



cartilage (right, 



left). 

 Eecessus orbitalis. 

 Anterior rectus 



muscle. 

 Dorsal rectus. 

 Posterior rectus. 

 Ventral rectus. 

 Sulcus of tct. opt. 

 Optic tectum (right, 



left). 

 Outer layer. 

 Optic fibre layer. 

 Optic fibrillar layer. 

 Granular layer. 

 Fillet, longitudinal 



and cross layers. 

 Gray layer. 

 Reticulate andepen- 



dymal layer. 

 Trabecule cranii. 

 Supraorbital bar 



(right, left). 

 Anterior part of left 



supraorbital bar. 



trb. su'orb. s. p. . Posteriorpart of left 

 supraorbital bar. 



trt. opt. (d., V.) . Optic tract (dorsal, 

 ventral part). 



tu. co'nt. tis. . . Connective tissue 

 sheath. 



ur'stl Urostyle. 



vnt. opt. . . . Optic ventricle. 



I, ... X . . . First, . . . tenth cra- 



nial nerves. 

 I.(dx.,s.) . . Olfactory nerve 

 (right, left). 



II. {dx., s.) . . Optic nerve (right, 



left). 



//. d Dorsal portion of 



optic tract. 



II. V Ventral portion of 



optic tract. 

 V. opt. su. . . . Superior ophthal- 

 mic branch of 

 nerve V. 



V. opt. pfnd. . . Deep ophthalmic 



branch of nerve V. 



For explanation of Greek letters, 



see text. 



