520 Notices of Memoirs—L. Dollo—On Iguanodon, ete. 
“the end of a long outstanding paroccipital process, as in the Lacer- 
tilia.” The discovery of the actual styloid bone in Plioplatecarpus 
leads to a different conclusion; and M. Dollo considers that the 
element corresponds to that termed suprastapedial by Parker, the 
cavity thus receiving the appropriate name of “fossette suprastapé- 
diale.” 
VI.—Ievanopoyripz ut Cauprono1iv&. By Louis Dotto. Comptes 
Rendus, March 12th, 1888, pp. 775-777. 
qn 1882 Professor Marsh defined the two Dinosaurian families 
under discussion as follows :— 
CampronoTip®.—Clavicles absent; post-pubis complete (Camp- 
tonotus, Hypsilophodon, Laosaurus, Nanosaurus). 
Iauanopont1p#.—Clavicles present; post-pubis incomplete (Igua- 
nodon, Vectisaurus). 
In the same year, M. Dollo attempted to show that the supposed 
clavicles were really sternal bones, and proposed a rearrangement 
thus :— 
HypsiLopHopontTip#.—F our functional toes. Sternum consisting 
of a simple rhomboidal bony plate (Hypsilophodon). 
Ig@uanoponT1p#.—Three functional toes. Sternum consisting of 
two bony plates, one left and one right (Camptonotus, Iguanodon, 
Laosaurus, Nanosaurus, Vectisaurus). 
A reconsideration of the subject now induces the Belgian Palzon- 
tologist to return to Professor Marsh’s original arrangement, with 
amended definitions, thus :-— 
Campronotip#.—Premaxille toothed. Sternum unpaired, manus 
morphologically pentadactyle, and reduced on the ulnar border and 
in the centripetal direction. Thumb normal. Ossification of the 
pubis extending to the extremity of the ischium. Fourth trochanter 
pendent. Four functional pes-digits. 
(a.) Two phalanges in manus-digit v. Preacetabular process 
of the ilium slight. No rudiment of pes-digit v. (Camp- 
tonotus.) 
(b.) No phalange in manus-digit v. Preacetabular process of 
the ilium long. A rudiment of pes-digit v. (Hypsilophodon.) 
Iauanopontip#. — Premaxille edentulous. Sternum paired. 
Manus morphologically pentadactyle, and reduced on the radial 
border and in the centrifugal direction. Digit v. normal. Pubis 
only extending to the distal extremity of the ischium in a ligament- 
ous state. Fourth trochanter crest-like. Three functional pes- 
digits. (Iguanodon.) A.S.W. 
VII.—List or Fosstn Mammatta. By Dr. Orro Roger. Bericht 
Naturw. Vereins Schwaben u. Neuburg in Augsburg, vol. xxix. 
(1887), pp. 1-162. | 
HIS important work of reference is a new edition of Dr. Roger’s 
list of known fossil mammalia published in the Correspondenz- 
blatt Regensburg. zool.-min. Verein, 1879-82. It incorporates the 
recent results of Schlosser, Lydekker, Trouessart, and the American 
paleontologists, and is thus brought well up to date. 
