1883. | Geology and Paleontology. 1277 
judging from the symmetry of the matrices of the meropodites, 
_ as well as from the general cylindrical character of limbs them- 
selves. 
On the ventral surface of the pygidium there are at least twelve 
(pairs of) appendages ; posteriorly, an exact enumeration is im- 
possible. The term pairs is used on account of the median groove, 
showing in the structures a bilobed character. This groove is 
continuous with the thoracic groove, and is somewhat narrower 
and more shallow than the latter. From an examination of the 
two specimens, these twelve or more appendages appear to be 
leaf-like, or foliaceous, and on each side of the median groove the 
direction was outward and somewhat forward, No doubt these 
appendages were branchial in function, and also adapted to swim- 
ming, 
EXPLANATION OF PLATES XXVI AND XXVII. 
Fic. 1.—Natural size. aa, meropodites of anterior pair of appendages—maxilli- 
pedes ; 44, eighth pair of (thoracic) legs; c, articulation between carpopodite and 
Propodite ; d, articulation between propodite and dactylopodite; e, branchigerous 
organs beneat idi 
IG. 2.—The specimens 1 and 3 fitted together, and reduced to nearly one-third 
nat. size, 
Fic. 3.—a a, matrices of meropodites of anterior pair of appendages; 6 4, ma- 
trices of eighth pair of legs; c, branchigerous appendages; æg, left maxillipede, 
Probably chelate; e, left lobe of hypostoma. 
—F. Mickleborough, Fourn. Cincinnati Soc. Nat. Hist. 
Grotocicat Nores. — Triassic and Permian, — Among new 
Stegocephali lately described by Herr Credner from the Dyas of 
axony, are Acanthostoma vorax, Melanerpeton spiniceps, and Dis- 
cosaurus permianus. The last is remarkable for the round disk- 
like plates, built up of concentric rings, that cover its body. 
Cretaccous—M. L. Dollo (Bull. du Mus. Roy. d’Hist. Nat. 
Belg.) describes some remains of dinosaurs from the Upper Cre- 
taceous of Belgium. Two vertebræ from the Mæstricht beds 
may perhaps belong to the form described from the same beds 
by Professor Seeley. An ungual phalanx from Louzee is evi- 
dently that of a carnivorous dinosaur of about half the size of 
_ S10n and other details of form, as well as in the fineness of the 
_ prations, are ascribed to a new genus and species, and named 
— byM. Dollo Craspedodon louzeensts. 
Tertiary —In a recent issue of the Geological Magazine, Pro- 
““Ssor Owen gives a basal view of the skull of Thylacoleo, show- 
ing Clearly the very small size of the space for the cranial cavity 
: € expansion and strength of the zygomatic arches. 
