363 
DESCRIPTION ОЕ PLATES XXVIL —XXXI. 
Plate XXVII. 
A. Plesiosaurus australis, Owen. (No. lb, one-fifth of natural size). ^ Locality— 
Amuri Bluff, 
General view of thorax, seen from above, as exposed in the slab, showing the 
neural spines traversed by a vein of calespar, which continues through one of the Hine 
bones and both femora. The large quadrate pubie bones lie on either side. The ri 
are recurved and continuous with the transverse processes. A few only of the dorsal 
and caudal vertebral centra preserved in the slab have been figured, and one group of 
the d ribs in the upper right-hand corner. 
B, С. Polycotylus tenuis, Hector. (No. 7a, one-fourth natural size.) 
В, B', humerus ; C, C', anterior dorsal vertebral centrum. 
Plate XXVIIT. 
A. Plesiosaurus crassicostatus, Owen. (No. 2a, one-third natural size.) 
Ribs of the right side and ventral aspect of the cervical vertebre, one of which is 
displaced so as to exhibit the articular facet. Three centra of dorsal vetebrx, figured in 
the upper part of the plate, were extracted from R the ribs. 
B. Plesiosaurus hoodii, Owen. (No. 3a alf natural size.) 
В, left side ; В’, ventral view ; В”, Изи ше view. 
Plate XXIX. 
Mauisaurus haastii, Hector. A. (No. 8a, one-sixth natural size). 
General view of the coracoids and paddle of the left side, restored from the portions 
collected by Dr. Haast at the Cheviot Hills. The paddle has nearly one-third greater 
breadth than is shown, being seen obliquely in the drawing. 
а, superior aspect of the humerus ; a’, inferior aspect of the same bone, from a cast, 
placed in the position of the humerus of the na: side ; а”, side view of the humerus ; 
b, | e of the scapula. 
No. 8с, one-third natural size.) В, posterior; В, anterior, and В", superior 
view e an anterior dorsal vertebra. Locality—Amuri 
— 
Plate XXX. 
Leiodon haumuriensis, Hector. 
A. Jaws, with teeth of right side. (No. 10a, one-fifth of natural size.) 
The teeth have been made more distinct than in the original, but are copied from 
the jaw of the other side, in which they are well preserved. The fourth and tenth pairs 
are broken off and not represented, but the bases are quite distinct in the specimen. In 
many of the others the enamel has flaked off in working out the bones from the matrix. 
The specific name is from Haumuri, the correct Maori spelling of the name of the locality 
whence this fine specimen was obtained. 
B. Posterior dorsal or lumbar vertebra. (From No. 10d, one-half natural size.) 
В, view of right side; В’, anterior articular surface, showing the form of the cup ; 
C, portion of rib from same slab, showing the excavated form of the articular surface. 
