

Cerebellum.. 



Ventricle IV- 



Periotic capsule . 



Parts of labyrinth . 



Medulla 



Ganglion nerve V., 

 Recti. oc. ext. and choroidal 

 arteries 

 Hyomandibular 



Trabeculae cr. 



Palato-pterygoids. 



FIG. m. 



trout embryo, In, 



no, but further back in i fhe section 



almost horizontally along the trabeculae cranii, which 

 here form a single mesial rod. See pp. 40, -14. 

 Anteriorly, the trabeculae are seen to articulate with 

 the palato-pterygoids ; behind them the two extern, il 

 recti of the eye are passing through the pituitary 

 space in company with the two choroidal arteries. 

 The head is somewhat compressed in the sagittal 

 plane. ( x 24. ) 



. ... Spinal cord 



Neural archcartilage 

 Half rings of cartilage below 

 the spinal cord 



Muscular raphe 



Aorta 

 Wolffian body 



Intestine 



i lion "i b 



uf tn, ui embiuj just behind the pec 

 fins, showing local absence of tin- 

 chord. The adjacent neural and li 

 arch cartilages (use together to form a 

 series of half rings below the spinal cord. 

 The lateral muscles meet in a m 

 raphe above the dorsal aorta and I 

 the spinal cord. See p. 54. ( >. 20.) 



Tegminal cartilage 



Cerebral lobes J 



Muscular tissue 



Lens . 



The adjacent lateral muscular 



masses uniting 



_ The two spinal cords 



. The two notochords 



. . The two Wolffian Iwdies 

 _. The two intestinal canals 



The two livers 

 ... The common yolk mass 



I i<;. H2. Transverse section thr<Mii;!i 

 atrophic head of an embryo trout, in 

 Inch the lenses alone of al' the eye struc- 

 ttnes have survived. K\en the mouth, 

 the Mi-ekel's cartilages, the trab> 

 and i 

 See pp. 60, 61 



Fie. 114. Trans\ cr-" muster In-longing to tin 



described under Class V. <>n ] ;> 20-21. The section passes acro- 

 mi'MI structures coming togei 



here separate, as also 



['I. XXVI. 



J. F. G. 



XXVI 



