302 
DE. CLELAM) ON THE EELATIONS 
continuous with their inferior margin ; and between this angle and the point where the 
vomerine groove is continued on to the intermaxillaries, there intervenes a considerable 
space in which the vomer comes in contact with the intermaxillaries by the edge of a 
triangular development of mesial plate (fig. 22). 
In the Edentata the vomer has its superior connexions typical. In Orycteropus its 
inferior margin reaches back to the palatals, in Manis and Myrmecophaga it does not; 
and in Bradypus it only articulates with the anterior part of the maxillaries. The inter- 
maxillaries are very small. They are smallest in Bradypus. In B. didactylis and B. tor- 
quatus they are separate ; in B. tridactylis they are fused into one little plate, which is 
in contact with the maxillaries by its posterior and lateral angles, and anteriorly turns 
upwards upon the septal cartilage. In Myrmecophaga the intermaxillaries are some- 
Avhat better developed, but the incisive foramina being large, the mesial-palatine pro- 
cesses do not quite come in contact with the vomer, even though the latter projects some 
distance forwards beyond the maxillaries. 
The intermaxillaries of the Armadillo are very characteristic. Their lateral plates are 
broad, and meet together in the middle line of the palate behind the incisive foramina. 
These foramina are small ; and the mesial-palatine processes which separate them are 
slender, but are prolonged back upon the superior aspect of the line of junction of the 
lateral plates, so that thus the vomer rests upon the mesial-palatine processes, according 
to the general rule, and does not come in contact with the lateral plates. 
In the Marsupiata the relations of the vomer are normal. Sometimes, as in the 
Koala, the inferior margin articulates Avith the palatals ; sometimes, as in the Kangaroo, 
it does not. The groove for the septal cartilage is open in front, as in the Carnb/ora. 
In the Kangaroo (fig. 23) the ethmovomerine laminae are very broad: the vomer exhi- 
bits on each side a peculiar lateral ridge, which extends forAvards from the point where 
the ethmo vomerine lamina comes off, and articulates in front Avith a very long prolonga- 
tion backwards of the mesial process of the intermaxillary, which extends between it 
and the maxillary. This ridge exists also in the Wombat, the Phalangers, and the 
Opossum ; probably it is a constant marsupiate characteristic. 
Cetacea. — In the Manati and Dugong we again meet with the arrangement of the 
vomer and intermaxillaries which we found in the Tapir, viz. the vomer is quite uncon- 
nected with the intermaxillaries, and the latter have no traces of mesial-palatine pro- 
cesses. The lateral plates of the intermaxillaries are very well developed, and meet 
each other above and in front of the septal cartilage, as they do in the Horse and the 
Tapir. In the Manati the anterior extremity of the vomer projects beyond the anterior 
margin of the maxillaries; in the Dugong it falls considerably short of it. In the 
Dugong the turbinations of the lateral masses of the ethmoid are very slight ; but their 
framework is strong, and united by ethmovomerine laminse to the vomer (fig. 24). In 
the Manati the lateral masses of the ethmoid are considerably more developed ; they 
also are united to the vomer. 
In the carnivorous Cetacea the vomer is largely developed, and its inferior margin 
