Scudder.] 358 [Apr. 6, 



betulae ; nor is it found in Heodes phloeas or hypophlaeas nor in 

 Feniseca tarquinius. 



The lateral extensile organs of the eighth abdominal segment 

 are less common. Among the Lycenidi they occur in our comyn- 

 tas and pseudargiolus and in the European argiolus, aegon, adme- 

 tus and corydon, but are absent from minima and iolas, and appar- 

 ently from icarus. They are found also in Thestor ballus, but in 

 none of the Theclidi or Chrysophanidi mentioned above. 



The species in which they were both observed by Guenee was 

 baetica, adding another to the list. Goossens also found them in 

 the European argiolus and expressed the opinion that they will be 

 found in all the other blue butterflies. 



General Meeting, April 6, 1887. 



The President, Mr. S. H. Scudder, in the chair. 



Dr. E. G. Gardiner discussed the development and homologies 

 of hoofs, claws and nails, describing his observations on the hoof of 

 the pig, horse and other animals, compared with the claws of the 

 carnivora and nails of the ape and man. 



Mr. Scudder read a paper on fossil butterflies showing the rela- 

 tionships of the known species, and comparing the Old World with 

 the New World forms. 



General Meeting, April 20, 1887. 



The President, Mr. S. H. Scudder, in the chair. 

 The following paper was read : — 



NOTE ON THE EPIDERMAL SYSTEM OF BIRDS. 



BY J. AMORY JEFFRIES, M.D. 



Some time ago Dr. E. G. Gardiner 1 attacked parts of my arti- 

 cle, on the " Epidermal system of Birds," read before this society 

 in 1883 ; since then accident has prevented my replying. 



1 Beitrage aur Kenntniss des Epitrichium und der Bildung des Vogelschnabels 

 (Arch. Mikr. Anat. xxiv, 289.) 



