12 



Discoglossus pictus (Jan.- 

 June) 



Hyla arborea 



Hyla cinerea 



Hyla crucifer 



Hyla regilla (March-Apr.) 



Phrynosoma sp. 



Rana catesbeiana 



Rana catesbiana (Apr.-Nov.) 



Rana clamitans 



Rana dalmatina (March- 

 Apr.) 



Rana dalmatina 



Rana esculenta 



Rana nigromaculata (Apr.- 

 Nov.) 



Rana palustris 



Rana pipiens 



Rana pipiens sphenocephala 



Rana rugosa 



Rana sylvatica 



Scaphiopus Holbrookii 



Xenopus laevis 20 i7), 22 -'), 



REPTILIA 

 Chelonia 



The supply of Aves and Mammalia is covered by the "International Com- 

 mittee on Laboratory Animals" (Hon. Executive Seer.: Dr. W. Lane-Petter, 

 Laboratory Animals Centre, M.R.C. Laboratories, Woodmansterne Road, 

 Carshalton, Surrey, England). 



^) in exchange for Pipa americana 



^^) in exchange for early reptilian stages, any spec. 



^^) in exchange for Xenopus laevis, Anolis carolinensis 



^^) in exchange for Hyla (fixed stages) 



^*) in exchange for Ambystoma mexicanum 



^^) in exchange for Pleurodeles Waltlii 



B. LIST OF NAMES AND ADDRESSES 



(geographical order) 



N. AMERICA 

 Canada 



1 Dr. P. FORD Dept. of Zool., Univ. of British Columbia, VAN- 

 COUVER 8, B.C. 



United States 



2 DEPT. OF BIOLOGY, Wesleyan Univ., MIDDLETOWN, Conn. 



3 DEPT. OF BIOLOGY, Wayne State Univ., DETROIT 2. Mich. 



