638 General Notes. 
Carboniferous Limestone at Alton, Ill. The lower jaw is about 
a foot long, an inch and a half wide in front, and widens to four 
inches behind. It is marked on the upper margin by a series of 
thin shell of bone, enclosing a large area, whi 
occupied by cartilage. The dentary differs from that of Rhizodus 
in being entire. 
Titanichthys clarkii Newb., discovered by Dr. W. Clark near 
rea, O., exceeds in size even the T. agassizii of which drawings 
were exhibited at the meeting of the American Association at Mon- 
treal, 1882. The broadly triangular cranium measures five feet or 
more between the posterior lateral angles. It is concave behind, 
and the central part of the arch is marked by a broad depression 
as in Dinichthys. The condyle of the. post-temporal bone is hori- 
zontal and broad, and is clasped in a furrow at the angle of the 
cranium. The post-temporals are a foot and a half wide, and, as 
in Dinichthys, are overlapped by the clavicles below and by the 
dorso-median plate above. This plate is sub-circular, and has a 
long, slender, furrowed process projecting backward and down- 
ward. The sub-orbital bones are eighteen inches long, the man- 
dibles three feet. The posterior end of the mandible is spatu- 
- late, six inches wide, and turned upward ; the anterior end is turn 
up like a sled-runner, and is excavated by a deep furrow some 
what as in T. agassizii, but the whole jaw is much heavier and 
broader. The under side of the body was protected by a triangu- 
lar plate three feet long and nearly as broad, having a deep sinus 
posteriorly and a rounded projecting angle near the middle of either 
side. 
Mesozorc.—Mr. A. S. Woodward (Quart. Jour. Geol. Boc., Mar; 
1888) describes Semionotus capensis and Cleithrolepis extont, bo 
from the Stormberg Beds (Early Mesozoic) of the Orange F pa 
State. The only species of Cleithrolepis before described, 18 f 
granulatus, from the supposed Triassic Hawkesbury Beds w 
New South Wales. The South African specimens afford sufficien 
data to prove that the genus must be placed with the Dapediidæ. 
A. Weithofer describes in the Annals of the Naturhist pyre 
Hofmuseum of Vienna, a new Dicynodont (Dicynodon sunocep is 
from the Karroo formation of South Africa. The gran 
unfortunately only an imperfect half of the cranium, lacking the 
lower jaw, yet it offers characters which distinguish it from hly 
species described by Owen. ‘The parietal region 15 Very. ve 
developed, rising eleven centimetres, or more, above the lme 
