Of the four anterior measurements of the viscerocranium, only one parameter (A) of one measurement (CONDYLEW) was found to be significantly greater in the giant rabbits, although all As were larger in the giants (Table 4).
There were many more statistically significant differences between the white rabbits and the dwarf rabbits than there were between the giants and whites, especially in the viscerocranium and orbital regions (Table 5).
(7) Angular height of the viscerocranium (viscerocranium length) from the median point of the naso-frontal suture to the median point of the line joining the most oral points of the praemaxillae N-P (Nasion--Prosthion).
The structural elements characterising both the breadth and the length of the viscerocranium: length of the nasal bone N-Rh (measurement 15), breadth of the facial part of the cranium across the facial tuberosities Sm-Sm (measurement 36), greatest breadth across the nasals (measurement 37) and greatest breadth across the premaxillae (measurement 38), developed to the age of full somatic maturity of rams (Table II).
To day 270 of age, the angular height of the viscerocranium N-P (measurement 7) and the length of the praemaxilla Ni-P (measurement 20) increased as well.
This process was accompanied by a decrease in the participation of the neurocranium length and an increase in the participation of the viscerocranium length.
Ultimately, development of the squamous part of the frontal bone with its orbital part (pars orbitalis) and orbital margin (margo orbitalis), being the components of the dimension Ectorbitale-Ectorbitale, had the greatest effect on a decreasing value of the cranial index 1, with an increasing length of the viscerocranium.