Mus., 1893-1896) accepted Cope's principles, and mainly by .combining the Asinea of Stannius and Cope with the Proteroglypha as Colubridae - wherein he was followed by Cope, as mentioned above - and separating therefrom the Peropoda or Boidae, he has produced a logically-conceived system, by far the best hitherto proposed.
Boulenger's phylogenetic system stands as follows: Viperidae Uropeltidae C. Opisthoglypha C. Proteroglypha Amblycephalidae mandible to the aglyphous or innocuous Colubridae, whence further differentiation in three new lines has taken place, - (i) the harmless Amblycephalidae as a side-issue, (2) the very poisonous proteroglyphous Elapidae, (3) the moderately or incipiently poisonous Opisthoglypha, out of some of which seem to have arisen the venomous Viperidae.
Ilysiidae Xenopeltidae Colubridae Aglypha Typhlopidae Boidae Glauconiidae 'This means that the Boidae retain most primitive characters.
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