632 PROF. H. G. SEELEY ON THE DINOSAURIA OF 
Anoplosaurus are not such as one would choose for the foundation of 
anew species, they differ from Anoplosaurus curtonotus in the absence 
of the basal ridges, which causes the base to be flattened, and in having 
flat sides, which are only broken by the tubercle which represents 
the transverse process, and which, prolonged into a ridge, divides 
the side into two areas. The facets for the chevron bones were so 
small that they have become obliterated by the wear to which the 
specimens have been subjected, and appear to have only marked the 
posterior ends. The best-preserved specimen has the centrum 
slightly oblique, 158; inch long, with the articular ends hexagonal, 
the posterior end being nearly 1,4, inch wide, 1, inch deep. The 
other two vertebree are ;1, of an inch longer, and the faint ridges of 
the base and sides are less developed ; so that the species is distinguished 
from the type of the genus by the more elongated form of vertebre, 
and by retaining the two basal angles after the transverse tubercular 
process had disappeared, as well as by the deep excavation of the 
neural canal in the centrum, and by the presumably larger size of 
the adult animal. It may be a convenience, pending the discovery 
of better materials, to indicate this species as Anoplosaurus major. 
A small fragment of a nearly smooth dermal plate, probably re- 
ferable to the Acanthopholis, was collected with these remains, but 
is too imperfect to yield any useful characters. 
Part VIL. 
On a small serves of Caudal Vertebre of a Dinosaur from the Cam- 
bridge Greensand (Acanthopholis eucercus, Seeley), contained in 
the Woodwardian Museum of the University of Cambridge. 
This note is founded on the small assemblage of six caudal ver- 
tebree catalogued in my ‘Index to the Secondary Reptiles in the 
Woodwardian Museum,’ as Series vi. (p. 24). They indicate a close 
resemblance to the tail-vertebree of Acanthopholis horridus, Huxley, 
but differ in the more elongated form and more constricted condition 
of the centrum, in the somewhat different development of ridges 
upon the side of the centrum, in the rapid diminution in length of 
the centrums, which in the type species remain all of about the 
same length, aud in the greater size of the bones now described, 
which appear to indicate a rather larger species. The collection 
was purchased by the University from Mr. Farren; and I see no 
reason to doubt his statement that the vertebrae were found asso- 
ciated, and form part of the skeleton of one individual. 
The earliest specimen preserved is an early caudal. It is robust, 
about 27 inches long, and 1,4, inch deep in the anterior articular face, 
which is subcircular and fairly concave; the posterior articulation 
is broken, but was subhexagonal, not so deep in vertical mea- 
surement, and similarly cupped. ‘The body of the vertebra is 
subeylindrical, with six more or less marked longitudinal ridges, 
two on the base, slight and rounded, separated by an interspace of 
less than half an inch, which interspace is a slightly impressed me- 
dian channel, most marked towards the two ends of the centrum. 
