176 FREDERICK TILNEY AND LUTHER F. WARREN 



CARNIVORA. 1. Phoca vitulina and Rosmarus obesus. Tur- 

 ner ('88) . 40 In the walrus and seal the pineal body has a greater 

 relative magnitude than in other mammals. 



2. Canis familiaris. Tiedemann ('23) ; 395 Faivre ('55) ; 114 

 Flesch ('88) ; 123 Dimitrova ('01) ; 92 Favaro ('04) ; 118 Cutore; ('10). 76 

 In this species the pineal body is conical in form. It is relatively 

 small. Its diameters are: 



cm* 



Longitudinal 0.4 



Transverse 0.3 



Anteroposterior 0.1 



Histologically, it consists of neuroglia, nerve fibers, and 

 parenchymal cells which are polyhedral in form and arranged 

 in acini. Some cells contain pigment granules. In addition to 

 these elements there are large cylindrical ependymal cells. 

 There are no concretions present. 



3. Felis domestica. Tilney ('15). 396 The pineal body in 

 the cat is even smaller than in the dog and it is ovoid in form. 

 Its diameters are: 



em. 



Longitudinal 0.20 



Transverse 0. 15 



Anteroposterior 0. 10 



Histologically, it resembles the epiphysis of the dog. 



4. Felis leo. Parisini. 300 This author described concretions 

 in the pineal body of the lion. 



PRIMATES. 1. Troglodytes niger. Mdller ('90) ; 278 Marshall 

 ('61) ; 261 Dendy and Nicolls ('II). 88 In this species the pineal 

 gland lies in a groove between the superior colliculi and has an 

 unpaired peduncle. There is a deep pineal recess and a well 

 developed suprapineal recess. No concretions were described 

 in this species. 



2. Macacus sinicus. Cutore ('12). 76 In this species the di- 

 mensions of the pineal body are: 



cm, 



Longitudinal 0.5 



Transverse 0.2 



Anteroposterior 0.2 



