1274, General Notes. [December, 
primitivement des éléments séparés et que, sez/s, les Dinosauriens 
et les Oiseaux persideraient ce dernier” (p. 97). I can only 
agree on the last point with Dollo. 
_ Sabatier! has figured the pelvis of a young Casuarius gale- 
atus. Inthis specimen the line which separates the ilium and 
the pubis crosses the “pectineal process ;’ the upper half be- 
- longs to the ilium, the lower one to the pubis, This I think 
affords a solution to the problem. 
The upper part of the pectineal process” forming a part of the 
ilium, corresponds to the whole “ pectineal process” of the Car- 
inate and to that part of the dinosaurian ilium which articulates 
with the pubis ; the lower part is homologous with the pubis of the 
dinosaurs, which has become quite rudimentary tn the Carinate. 
With this interpretation the researches of Miss Johnson’ agree, 
though only partially, for she considers the pectineal process of 
the chicken as the pubis. She found in embryos of the chicken 
a well-developed preacetabular part of the pubis, which she 
homologizes with the pubis of dinosaurs. This is quite true for 
the lower and anterior part, but we can only detect in the upper 
part elements of the pectineal process, z. e., elements of the ilium. 
A sharp line between the ilium and pubis at this time of dere) 
ment cannot be drawn, for both the ilium and the pubis consist 0 
a single cartilaginous mass. bis in 
It is interesting to trace the development of the postpubis! 
the series of dinosaurians and birds. 
gets shorter; in the Ratitæ there is only a sma 
pubis to be seen; in the Carinate (whether in a% Mt 
tion) it is quite rudimentary, whilst the postpubis has 
pa AAE EN NT em 
greatly developed. : 
A Mamma Po 
Carn, Dinos.{ Saurop. Stegos. Ornithop. Be a a 
oe aera well develop.| very small || ie radis 
Pubis .. . . | well devel- | welldevel, | well devel. | Reduction en emis mentary- n 
oped. ginning | pect. proc- a 
` TA |} (Iguanodon). | -apa 
- Postpubis . .| wanting. begins to | well devel. | well devel. well devel developed. 
appear. 
SS ee ee 
» ; TEAPA ese wor m 
a little larger larger than or| equal smaller th 
Ischium . .| larger than | larger than | than post- equal to praest e j postpubis- 
$ postpupis. | postpubis. |- pubis. | postpubis. | pos | Ja A 
j EE a á 
E ee 
ie des 
` . dans la série 
Ceint. et des Membres antèr: et poster (Sect. des 
Sabatier, N: Comp. des sances M 
Vertébrés. Montpellier, 1880. Mém. de l’ Acad. des Sciences 
Sciences, tom. 1x, 1880, Pl. vi, Fig. 1. woud the hind 
the development of the pelvic girdle and s ie Pl, xvi and 
Quart. Jour. Micr. Soc., Vol. XXIII, new SEN © 
f 7 
