THE PINEAL BODY 175 



2. Lepus cuniculus. Tiedemann ('23) ; 395 Marshall ('61) ; 261 

 Krause ('68) ; 219 Bizzozero ('68) ; 30 Hagemann (72) ; 164 Mihalko- 

 vicz (77) ; 275 Edinger ('97) ; 104 Staderini ('97) ; 372 Neumayer 

 ('99) .282 Favaro (>Q4) ; 118 Cutore ('10) ; 76 Sarteschi ('10). 345 



The pineal body in this species is long and cylindrical and of 

 such a shape as to justify the ancient term, penis cerebri. Its 

 diameters are: 



cm. 



Longitudinal ...................................................... 1.0 



Transverse ........................................................ 0.3 



Anteroposterior .................... ............................... 0.2 



Its histological appearance resembles that of adenoid tissue. 

 There are no pigment cells and no concretions. 



3. Cavia cobaya. Faivre ('55) ; 114 Hagemann (72) ; 164 d'Erchia 

 ('96) ; 109 Staderini ('97) ; 372 Favaro ('04) ; 118 Cutore ('10) ; 76 Sar- 

 teschi ('10). 345 In this species the pineal body is similar in form 

 to that of the rabbit. Its diameters are: 



cm. 

 Longitudinal ................................................. ..... 0.8 



Transverse ........................................................ 0.4 



Anteroposterior ................................................... 0.3 



Histologically, the organ resembles that of the rabbit. 

 4 Mus decumanus. Staderini '97 ; 372 Cutore ('10). 7G The 

 pineal body in this species is elongated. Its diameters are: 



cm. 



Longitudinal ...................................................... 0.5 



Transverse ......................................................... 0.3 



Histologically, it presents a rich vascularization and paren- 

 chymal cells similar to those of other rodents. Pigment and 

 calcareous concretions are absent. Neuroglia, nerve fibers, 

 elastic fibers, and lymphatic elements are also observed. 



5. Dasyprocta agouti. Sperino and Balli ('09). 37 In this 

 species the form of the pineal body is cylindricoconical. Its 

 appearance is brownish, its apex is retroflexed so that the struc- 

 ture rests in the intercollicular sulcus. Its diameters are : 



Longitudinal 

 Transverse.., 



