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Show 594 MR. A. H. GARROD ON THE [NOV. 3, never, as it happens, both together) have further aided in the formation of tertiary and further subdivisions, which, upon the dissections above given, would lead to the arrangement of the family which is depicted in Plate L X X. This may be represented in the tabular form as follows :- Suborder (or Cohort) PSITTACI. Family I. P A L ^ E O R N I T H I D J E . (Left carotid normal.) The ambiens muscle absent. Carotids two, except in the genus Cacatua. Subfamily (1) PALJEORNITHINJE. NO further deviation. Palaornis. Eclectus. Aprosmictus. Tanygnathus. Prioniturus. Psittinus. Loriculus. Trichoglossus. Lorius. Eos. Subfamily (2) CACATUINJE. Orbital ring completely ossified, and characteristic in that it develops a process bridging the temporal fossa (vide Plate L X X L ) . Calopsitta. Calyptorhynchus. f Licmetis. •I Eolophus. ( Cacatua. Subfamily (3) STRINGOPIN^E. The furcula lost *. Stringops. ' Euphema. • Geopsittacus. Melopsittacus. Agapornis. Family II. PSITTACID^. (Left carotid superficial.) Division 1. The ambiens muscle present. Subfamily (4) A R I N . E . N O further deviation. Ara. Conurus. Bolborhynchus. Ca'ica. Psittacus. Pceocephalus. Nestor. * See the special remarks on this group in the postscript to this paper. |