1894.] Geology and Paleontology. 417 
sylvania, Maryland, Virginia, North Carolina to-Georgia. (Journ. 
Geol., Vol. II, 1894.) 
PaLEozoric—A remarkably well preserved Lepidodendron from 
E’snost near Autun is described by M. B. Renault under the name 
Lepidodendron esnostense. ‘The specimen shows the stem, leaves, fructi- 
fication and roots. Attached to the rootlets are small ovoid bodies sup- 
posed by the author to be the eggs of an aquatic insect, to which he 
gives the name Arthroon rochei. These same bodies have been observed 
upon L. rhodumnense, found near Combres (Loire), and described by 
M. Renault some fifteen years ago. (Rev. Sci., Feb., 1894.) 
Mr. J. M. Clarke reports the discovery of a perfect specimen of the 
extreme apex of an Orthoceras, showing the nature of the protoconch. 
The fossil was found in the Styliola limestone of the Genesee shales, on 
Canandaigua Lake, New York, in an association of species which rep- 
resents the earliest appearance in North America of the fauna of 
Goniatites intumescens Beyrich. The specimen consists of the apical 
chamber, to which the protoconch is attached. The upper end of the 
Specimen shows the first septum to be circular and with a central sipho. 
The lateral walls of the first chamber taper rapidly to the plane of con- 
junction with the protoconch, and its depth is about one half that of 
the latter. The protoconch itself is semi-ovoid in shape, and when 
pared with those of Orthoceras previously described or figured fin the 
shrunken condition] is of very large size. It shows no indication of 
shrinking and its distal extremity is perfectly smooth. The length of 
the entire specimen is .85 mm.; that of the protoconch, .60 mm.; and 
the diameter of the first septum 1 mm. (Am. Geol., Vol. XII, 1893.) 
Mesozo1c.—From a study of the fossil mammalia of the Stonesfield 
slate, Mr. E. S. Goodrich concludes that the primitive mammalian 
molar was probable tritubercular, and that the triconodont type was 
derived from it by degeneracy, contrary to the views of Cope and Os- 
™ who assume that the primitive mammalian molar was repre- 
sented by a simple reptilian cone which subsequently acquired a cusp 
in front and behind giving the Triconodont type, from which the Tri- 
tubercular type was derived. (Quart. Journ. Micros. Sci., Vol. 35.) 
Mr. R. Lydekker figures and describes a new carnivorous Dinosaur 
from the Oxford Clay of Peterborough. The specimen comprises the 
anterior and posterior extremities of the left ramus of the mandible, 
and represents one of the Thecodontosauridæ. Since it differs from the 
described genera by the marked deflection of the mandibular symphy- 
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