1. Beddard F (1895a) On some points of the anatomy of Pipa americana. Proceedings of the Zoological Society of London 53:827–841
2. Beddard F (1895b) On the diaphragm and muscular anatomy of Xenopus. Proceedings of the Zoological Society of London 53:841–846
3. Bock WJ, Wahlert G (1998) Adaptation and the form-function complex In: Allen C, Bekoff M, Lauder GV (eds) Nature's Purposes. Analyses of Function and Design in Biology. MIT, Cambridge, MA, pp 117–168
4. Boggs DF (2002) Interactions between locomotion and ventilation in tetrapods. Comparative Biochemistry and Physiology A 133:269–288
5. Brainerd EL (1999) New perspectives on the evolution of lung ventilation mechanisms in vertebrates. Experimental Biology 4:11–28