66 The American Geologist. July. i89i 
would be sufticient to show that the Dinosauria is an absolutely un- 
natural group without any right to existence; it shows that the three 
members, Iguanodon, Diplodocus and Ceratosaurus belong to three dis- 
tinct groups of Monocondylia, with very little relation to each other." 
In afoot note on page 4.50, Dr. Baur says: "* * Ccratops Mars^h is the 
same as Monoclonius Cope, as I know from actual study of the types. 
That Agathaumas Cope is the same as Triceratops Marsh will be ad- 
mitted by everybody who will compare the original plates of the sac- 
rum, dorsal vertebra? and the ilium of Agathaumas by Cope with those 
of Triceratops given by Marsh, I think that Macellognathus Marsh 
which has nothing whatever to do with the Testudinata, belongs to this 
family (Co'luridte) and to Coelurus." 
A remarkably important addition to this subject and a discussion of 
inestimable value. 
Two New Reptiles. H. G. Seeley. (Quart. Jour. Geol. Soc. XLVII, 
pt. 2, 1891, pp. 104-170.) 
Agrosa?(rus macgillivrayi. — This is described as a saurischian reptile 
from the N. E. coast of Australia. The specimen has been in the Brit- 
ish Museum since 1879, and as it was collected in 1844, has remained 
undescribed forty-six years. The reptile is named from a complete left 
tibia, portions of the right tibia, fibula and claw phalanges. The ani- 
mal was about the size of a sheep and is supposed to have come from 
the Lower Oolite or the Trias. The shaft of the tibia is slender, proxi- 
mal end enlarged and curved backward, a slight development of the 
cnemial crest; distal end uniformly increases in size and a moderate 
excavation of the distal articulation on the inner side. 
ISaurodesmus robei-tsoni. — A crocodilian reptile from the Rhietic of 
Linksfield north of Elgin. This is represented by one bone, apparently 
a humerus, which the author terms a "very unsatisfactory specimen." 
The bone was originally about 10cm. long. The description of this one 
bone is not conclusive and leaves some doubt as to the true position of 
the reptile, as according to Lydekker's description of the same speci- 
men, it has Chelonian features. 
The Geology of the Barbados. By A. J. Jukes-Bkowxe, Esq., F. G. 
S. and Prof. J. B. IIariusoxs, M. A., F. G. S. (Quart. Jour. Geol. Soc. 
XLVII, pt. 2, May 1891, pp. 197-243). This is an important contribu- 
tion, especially to the structure of the coral reefs, which naturally forms 
the chief component of the paper; there are two appendices by W. H. 
Hill, Esq., F. G. S. on the Microscopical Structure of samples from 
Barbados and Jamaica. 
A Revision of the Cretaceous Echinoidea of N. A. Du. W. B. Clark 
contributes to Johns Hopkins University Circular for April a brief pre- 
liminary notice of the Echinoidea of the Cretaceous, in which twenty- 
one new species are described, principally from Texas and New Jersey. 
Important New Mineral Locality.— Dr. G. H. Williams announces and 
describes anglesite, cerussite, galenite and native sulphur from the 
Mountain View mine near Union Bridge, Carroll Co., Md. (Johns Hop- 
kins Univ. Cir. April, 1891, p. 73). 
