238 
Geological Society. 
centrum is inclined obliquely forward; the facets for the chevron 
bone large, and the anterior articulation circular. The later caudals 
have nearly the same absolute length of centrum ; and the transverse 
process is first reduced to a tubercle, and afterwards disappears 
entirely. A deep channel is developed on the underside of the 
centrum ; and two more or less marked ridges run along each side 
of the centrum, making the articular ends subhexagonal. 
III. “ On the skeleton of Anoplosaurus curtonotus , Seeley.” 
This genus and species are founded upon an associated series of 
about 80 bones from near Reach. The remains include a portion of 
the left ramus of the lower jaw, 5 cervical (axis aud atlas missing), 
13 dorsal, 6 sacral, and 8 caudal vertebra) (the tail being imperfect), 
the coracoids (one imperfect), the proximal end of the scapula, the 
proximal and distal ends of the humerus, the proximal and distal 
ends of the femur, a small fragment of the ileum, small portions of 
ribs, and fragments of the metatarsals and phalanges. The teeth 
were placed close together in sockets, 13 occurring in a space of 2^ 
inches. The general form of the vertebral centra indicates a convex 
curve in the back and sacrum, and a concave curve in the neck and 
tail, rendering it probable, in conjunction with the great develop¬ 
ment of the sacrum, that the animal affected a semierect attitude. 
The sacral vertebrae, as preserved, are all separate. The scapula is 
remarkably thick, with a strong spinous or acromioid process. 
The femur shows distinctive Dinosaurian features, but presents a 
form that has not previously been described. The vertebral centra 
indicate a near affinity to Acanthopholis ; but no dermal armour has 
been met with, and the caudal vertebrae present differences which 
seem to justify its location in a distinct genus. 
IV. “ On the axial skeleton of Eucercosaurus tanyspondylus, 
Seeley.” This genus is founded on an associated series of 19 
vertebra) and a neural arch from Trumpington. Four dorsal ver¬ 
tebrae are preserved, which considerably enlarge towards the sacral 
region, so that probably the vertebral column was carried in a more 
than usually erect position. The underside of the centrum in the 
early part of the series has an angular or squeezed form ; but this 
appearance is lost in the hinder centrums. The sacral region is 
represented by 3 vertebrae; there were probably, in all, 5 or 6. 
Twelve early caudal vertebrae are preserved ; these become unusually 
elongated and prismatic posteriorly. The chevron bones were at first 
very large, but are small when the articular face of the centrum has 
acquired the hexagonal outline. The neural arch in the caudal 
region was very depressed. This genus was considered to be closely 
related to Acanthopholis, though the vertebrae differed so greatly in 
form. 
V. “ On the skeleton of Syngonosaurus macrocercus , Seeley.” 
This genus is founded on a series of 19 vertebrae, representing the 
neck, back, sacrum, and tail. It shows affinities to several Dino¬ 
saurian types, especially Eucercosaurus and Iguanodon. The early 
dorsal vertebrae are remarkably compressed ; and the neural arches 
are entirely united to the bodies of the vertebrae throughout the 
