106 BULLETIN or THE ESSEX INSTITUTE. 



Born and by Seydel is hardly applicable to Pipa. I have, 

 however, refrained from proposing any new names since 

 I believe that this can only be done in a satisfactory man- 

 ner by one who is making a comparative stndy of many 

 different forms, and not by one who has only the limited 

 perspective of a single species. Still it is well to point 

 out what terms are employed by Born for the nomencla- 

 ture adopted here which is based upon the terminolog}'^ of 

 Se3'del. 



Born distinguished three blindsacs which lie directly 

 under each other ; the upper being the largest and the 

 middle the smallest. Born's "unterer Blindsac " may be 

 compared to the Jacobson's organ in Pipa, while the 

 "oberer Blindsac" is the cavum nasale. Born also finds 

 another blindsac between the other two, which may possi- 

 bly be compared to a similarly lying unnamed blindsac 

 which Seydel found, the "a" of his figures, and possibly 

 to the enlargement of the lateral nasal canal in Pipa. It 

 is true that in Pipa it forms no blindsac, but it is special- 

 ized and forms an enlargement which, from the outside, 

 might readily he taken for an actual blindsac. This 

 enlargement is situated between the Jacobson's organ and 

 the cavum nasale in Pipa, but is more internal in Rana. 



[Published, lAlarch, 1897.] 



