THE CUTANEOUS GLANDS OF THE COMMON TOADS.* 



BY 



EFFA FUNK MUHSE. 



With 7 I'lat1!;s. 



CONTENTS. 



PAGE 



General Introduction 322 



Purpose and plan of paper 322 



Material 322 



Metliods 323 



Literature 324 



General Description of the Skin 324 



Unevenness 324 



Causes 324 



Classes of warts 325 



Coloration 326 



Color 326 



Arrangement of spots 326 



Relation of warts to spots 327 



Tlie Epidermis 327 



Strata 327 



Beaker cells 328 



Epidermis relative to the regions of the body 328 



The Cutis 329 



Strata 329 



Cutis according to regions 330 



Cutaneous Glands of the Toad — Introduction 331 



Literature 332 



Secretion and when expelled 334 



Origin of glands in the larva 334 



Gradation of glands in the adult 335 



Batteries of glands 335 



The Mature Gland 336 



Walls of the acinus 337 



Muscle fibers 337 



Epithelium 338 



Secretion 339 



Gland outlet 340 



Concentric zones 340 



Cog-wheel-like structure 341 



Duct 341 



Relation of outlet to epidermis and cutis 342 



The mature glands of different regions 342 



Expulsion of the secretion 343 



*Contributiou from the Zoological Laboratory of Indiana University, No. 96. 

 being a thesis accepted as in part fulfilling the requirements for the degree 

 of Doctor of Philosophy, June, 1908. 



The American Journal of Anatomy. — Vol. IX, No. 2. 



