118 FREDERICK TILNEY AND LUTHER F. WARREN 



10. Proteus anguinus. Galeotti ('96). 14 The pineal organ 

 in this form is small and pyriform and has no evidence of 

 secretory function. 



11. Salamandrina perspicillata. Galeotti ('96. 140 In this 

 species the pineal organ is a small, flattened structure. 



APODA. 



1. Ichthyophis gluiinosa. Burckhardt ('90). 42 The pineal organ 

 in this form is small and pyriform and has a short stalk, but 

 does not reach the skull roof. A well-developed paraphysis is 

 present. Fibers from the end- vesicle seem to make their way to 

 the commissura habenularis. 



ANURA 



1. Rana esculenta. Leydig ('68) , 233 In this species the end- 

 vesicle has a figure-of-eight shape and is solid. Leydig 238 later in 

 1891, could find no evidence of a parietal spot in Rana fusca. 

 deGraaf 155 in 1886 found a well marked end- vesicle which was 

 solid and round and a well-developed parietal spot. 



2. Ceratophrys. Lessona ('80). 241 There is a fairly well- 

 marked end-vesicle in this species. 



3. Bufo cinereus. Lessona ('80) 241 did not observe a pineal 

 organ in this form, but it was found subsequently by deGraaf 155 

 in 1886. Studnicka 386 also found it in young larvae. 



4. Pelobates fuscus. Lessona ('80) 241 found the end- vesicle 

 in this species. 



5. Discoglossus. Lessona ('80). 241 A fairly well-marked end- 

 vesicle exists in this species. 



6. Alytes obstetricans. Lessona ('80) , 241 In this form there 

 is a well-marked end-vesicle which was first accurately described 

 by deGraaf. 155 



7. Rana occipiialis and tigrina. Lessona ('80). 241 In these 

 forms the- pineal organ presents a well-marked end-vesicle. 



8. Pipa americana. Lessona ('80). 241 In this species there 

 is no end- vesicle. 



9. Hyla arborea. deGraaf ('86), 15 ' 5 and Leydig ('91) 238 both 

 found that the end-vesicle was absent and that the skin in the 

 usual position of the parietal spot showed nothing of the existence 

 of such a structure. 



