552 MAMMALS. 



DIAGRAM XXXII. 



Mammalian Structures. 



The diagram of the skull (after Flower) shows the bones, the mem- 

 brane-bones shaded, the cartilage-bones light; S.o., supra-occipital; Pa, 

 parietal; Fr, frontal; Na, nasal; L, lachrymal; Ex.o, ex-occipital; 

 y4j, alisphenoid; Oj, orbitosphenoid ; 7«r*., turbinal; jW^, mesethmoid; 

 Ps, presphenoid; Bs, basisphenoid ; B.o, basi-occipital ; Vo, vomer, 

 Pmx, premaxilla ; Mx, maxilla; Ju, jugal ; Pt, pterygoid; PI, pala- 

 tine; M, mandible; S, squamosal; Per, periotic; T, tympanic; Hy, 

 hyoid. 



The diagram of the brain (after Wiedersheim), shows the fore-brain 

 (F.B.), the corpus callosum {C.C.), the fornix (F.), the pineal gland 

 (P.g. ), the optic thalami ( Th. ) ; the anterior commissure ( C. ), the median 

 commissure ( C ) ; the posterior commissure ( C. ) ; the optic lobes ( Opt. I. ) ; 

 the cerebellum (CerebelL); the medulla oblongata (Med.), the foramen of 

 Munro (P.M.); the infundibulum (Inf.); the pituitary body (Pit.); the 

 optic nerve (//. ) ; the olfactory nerve (/. ). 



The diagram of the circulation (from Leunis) shows — the right auricle 

 (r.a.); the right ventricle (r.v.); the pulmonary arteries and veins to 

 and from the lungs (/.); the left auricle (l.a.); the left ventricle (l.v.); 

 the aorta (ao. ) to the anterior and posterior parts of the body (B.); the 

 arteries to the gut (G.) and the liver (Liv.); the portal veins (p.v.) from 

 the gut to the liver; the hepatic veins (A.w.) from the liver to the inferior 

 vena cava (i.v.c); the superior vena cava (s.v.c). The venous system 

 is darkly shaded. 



The development of a hair (after Hertwig) shows — the dermis (Derm) 

 and its papilla; the stratum Malpighii (s.m.) of the epidermis; the 

 stratum corneum (s.c.) of the epidermis; the formation of the hair- 

 follicle; the associated sebaceous glands (^. ) ; the developing hair (A.). 



