272 SKELETON OF THE BABBIT 



developed in immediate relation with the sense-cap- 

 sules, and may conveniently be considered with 

 them. 



a. Bones in relation with the olfactory capsules. The 

 olfactory capsules are of very large size in the 

 rabbit, and occupy a great part of the facial por- 

 tion of the skull. They are so closely connected 

 with the ethmoidal region and with the upper jaw, 

 that certain of the bones may be referred, with 

 equal propriety, to either of these divisions. 



i. The nasals are a pair of elongated membrane - 

 bones, forming the roof of the nasal cavities. 

 They unite suturally with the frontals behind, 

 and with each other in the median line. 



ii. The ethmo-turbinals are intricately folded laminas 

 of bone, fused to the lower surface of the cri- 

 briform plate of the ethmoid, and occupying 

 the upper and posterior part of each nasal 

 cavity. 



iii. The maxillo-tnrbinals are a pair of somewhat 

 similar, but more delicate and more complex 

 bones, lying in the anterior portion of the 

 nasal cavities, in front of the ethmo-turbinals. 



iv. The naso-turbinals are a pair of thin laminas of 

 bone, folded to form pouches, and fused with 

 the inner surfaces of the nasal bones. 



v. The vomers are a pair of slender blade-like bones, 

 fused with each other along their ventral 

 margins, and embracing the lower edge of 

 the mes-ethmoid cartilage. Behind they are 

 expanded laterally, and connected with the 

 ethmo-turbinals. 



b, Bones in relation with the optic capsules. 



The lacrymals are a pair of small lamellar bones 

 forming part of the anterior walls of the orbits, 

 and loosely wedged in between the frontals 

 and maxillae. Each is notched at its outer 



