THE MORPHOLOGY AND MORPHOGENESIS OF THE 

 CHOROID PLEXUSES WITH ESPECIAL REFER- 

 ENCE TO THE DEVELOPMENT OF THE 

 LATERAL TELENCEPHALIC PLEXUS 

 IN CHRYSEMYS MARGINATA 



l'i;i{(I\AL MAILi:V 

 From llic Aualoinirnl Lnlxunlni!/ of Die Xorthirrslrnt r>iii'crsilif Medical School^ 



TWKNTV-SKVKN FKiURES 



(•(».\ii;Ni-s 



Introduction 507 



History 5f;S 



Material and Methods . 519 



Doscri|)tioii 520 



Discussion 525 



Conclusions . 528 



IN ll{< (DICTION 



111 ;i rectMit coiiiinuiiicataoii. llic aullun- ( I^ailcy, 'L')) presented 

 an inteipietation of the latertil telenceplialie elioroid plexus in 

 the human embryo based on ontoj:;enetie and pliylop;enetic evi- 

 denee. The phylog;enetie evidence ])resented consisted of the 

 most accurate descriptions a\'aihible of the de\'elopment of this 

 structure in the lower vertebrates, viz., Warren's ('05) account 

 of Necturus maculatus and Tandler and Kant or 's ('07) account 

 of Platydactylus mauritanicus. With a \'iew to confirming, and 

 strengthening if possible, the phylogenetic evidence it was deter- 

 mined to in\'estigate more definitely the de^'elopment of the 

 prosencephalic choroid plexuses in others of the lower verte- 

 brates. The following scheme taken from Wilder was accepted 



1 Contrihutioii No. JJ. Suhinittcd for publication July 20, 1916. 



507 



