SEA-FISHERIES LABORATORY. 187 



cylinder, but the edges do not fuse behind. Except that 

 the eyeless condylar facet is larger than the ocular one 

 the asymmetry is not noticeable below the neural spine. 

 The centrum is overlapped by the large ill-defined anterior 

 zygapophyses of the 2nd vertebra, and itself bears faint 

 posterior zygapophyses at the bases of the neural arches, 

 whilst on the ocular side the latter sends back a 

 hook-like process which fits outside the neural arch 

 of the second vertebra. This is the only trace of 

 the characteristic method of articulation of the vertebra? 

 of the Cod. 



Second Vertebra (fig. 17, F. 2 ). — The neural arch is 

 perforated on each side by two foramina for the roots of 

 the third spinal nerve, but the bridge of bone separating 

 the right pair is extremely slender. The large irregular 

 anterior zygapophyses are asymmetrical, that on the eye- 

 less side being much the larger. The neural spine is also 

 asymmetrical as in the atlas, but the asymmetry extends 

 down on to the neural arch. A small pointed transverse 

 process is present, with a long accessory rib (A.JR. 2 ) 

 strongly attached to its base much lower down than the 

 attachment of the first intermuscular bone. Both the 

 centrum and neural arch bear post-zygapophysial facets 

 not shown on the eyeless side. 



Third Vertebra (fig. 17, F. 3 ).— Whole of the vertebra 

 markedly asymmetrical, being more strongly developed 

 on the eyeless side in every respect. Neural spine and 

 spinal canal arch to the left. Anterior and posterior 

 zygapophyses more strongly marked on the same side. 

 The centrum not only bears a strengthening ridge (S.R.) 

 which is much stronger on the eyeless side, but is itself 

 more bulky on that side, so that the notochordal canal is 

 eccentric in position. The transverse processes, like all 

 those succeeding them, and as already described by 



