XI. INSTRUCTION. 823 



No. 8. A piece of the small intestines of a cow that has died of the cattle 

 disease, opened and seen inside. The red colour, and the swelling of 

 the mucous membrane, in which Peyerian glands swollen and empty are 

 seen. 



No. 9. A piece like No. 8. Several black spots may be noticed. 



No. 10. A piece like No. 8 and No. 9. Besides the swollen glands the 

 difference of colour may be seen. 



No. 11. A piece like Nos. 8, 9, and No. 10. Here and there a difference 

 of colour is apparent. 



No. 12. A piece like Nos. 8, 9, 10, and 11. The mucous membrane appears 

 thinner and duller. 



No. 13. The end of the small intestines and the caecum of a cow that 

 has died of the cattle disease, opened and seen inside. The much- 

 swollen folds, the redness of the mucous membrane, as well as the black 

 spots, especially at the point of transition from the small intestines to 

 the large, are remarkable. 



No. 14. The end of the rectum of a cow that has died of the cattle disease, 

 opened and seen inside. The folds of a black colour, and the consider- 

 able swelling and redness of the mucous membrane are remarkable. 



No. 15. A piece of the skin of a cow that has died of the cattle disease, 

 taken from the inner surface of the leg. Grey crusts covering the 

 diseased parts of the skin, and between these the fissures in the true 

 skin, are to be noticed. 



3819. Skull of Sheep (Ovis aries). The bones have been 

 disarticulated and mqunted in segments, according to their mor- 

 phological relations, so that each segment may be removed for 

 lecture purposes. E. T. Newton, Museum of Practical Geology. 

 The following is the order in which the bones are grouped : 

 BRAIN CASE. 1st Segment. Basioccipital and two exoccipitals ankylosed, 

 supraoccipital. 



2nd Segment. Basisphenoid and two alisphenoids ankylosed, and 



two parietals ankylosed. 

 3rd Segment. Presphenoid and two orbitosphenoids ankylosed, and 



two frontals. 

 NASAL KEGION. Mesethmoid, two superior and two middle turbinals 



and vomer, all ankylosed, and two nasals free. 



AUDITORY REGION. Right side. Squamosal, tympanic and periotic 

 mass. (The periotic bones being ankylosed.) 

 Left side. Ditto ditto. 



FACIAL REGION. 1. The two premaxillse. 



2. Right side. Maxilla, jugal, lachrymal, and inferior turbinal. 



3. Left side. Ditto ditto. 



4. Right side. Palatine and pterygoid. 



5. Left side. Ditto ditto. 



FIRST VISCERAL ARCH. Right side. Ramus of lower jaw and malleus 



(latter, for convenience, mounted separately) . 



Left side. Ditto ditto. 



SECOND VISCERAL ARCH. The hyoid, consisting of basihyal, two 



ceratohyals, two epihyals, two stylohyals, and two tympanohyals. 



(One of the tympanohyals is left attached to the tympanic bone). 



The two thyrohyals belong to the third visceral arch, but are mounted 



here for convenience. 



The incus and stapes of each side are mounted separately on account 



of their small size ; but the former belongs to the second visceral 



arch, and the latter is most probably a part of the auditory capsules. 



