...occipital, where it at once bifurcates, a transverse brancli passing across over the posterior part of the median occipital to join its fellow of the opposite...to join the opposite groove on the premedian plate, on which it forms a small backward flexure. This course is altogether similar to that in Asterolepis...

...occipital, where it at once bifurcates, a transverse branch passing across over the posterior part of the median occipital to join its fellow of the opposite...to join the opposite groove on the premedian plate, on which it forms a small backward flexure. This course is altogether similar to that in Asterolepis;...

...slit is completed externally by the two articular plates coming together above the external marginal. The tail (in Pterichthys) is covered with small, rounded,...that genus comes to be specially considered. Genus ASTEROI.EPIS Eichwald Definition. Median dorsal plate overlapping both the anterior and posterior dorsolateral...

...arriving in front of the median opening it bends inwards to join the opposite groove on the premediau plate; a slightly different arrangement, however,...specially considered. Genus ASTEROLEPIS Eichwald. Median dorsal plate overlapping both the anterior and posterior dorso-lateral plates. Arms shorter...

...occipital, where it at once bifurcates, a transverse branch passing across over the posterior part of the median occipital to join its fellow of the opposite...to join the opposite groove on the premedian plate, on which it forms a small backward flexure. This course is altogether similar to that in Asterolepis...