Dear colleagues, We are pleased to announce a new paper published recently in IOP Bioinspiration & Biomimetics Dible, S.A., Flint, J.A., Lepper, P.A. *On the role of periodic structures in the lower jaw of the Atlantic Bottlenose Dolphin* (/Tursiops Truncatus/) Bioinspir. Biomim. 4 (2009) 015005 This article is available from http://stacks.iop.org/1748-3190/4/015005. if you have any problems downloading the article please contact me. ABSTRACT This paper proposes the application of band-gap theory to hearing in the atlantic bottlenose dolphin (/Tursiops truncatus/). Using the transmission line modelling (TLM) technique and published computed tomography (CT) data of an atlantic bottlenose dolphin (/Tursiops truncatus/), a series of sound propagation experiments have been carried out. It is shown that the teeth in the lower jaw can be viewed as a periodic array of scattering elements which result in the formation of an acoustic stop band (or /band gap/) that is angular dependent. It is shown through simple and complex geometry simulations that performance enhancements such as improved gain and isolation between the two receive paths can be achieved. This mechanism has the potential to be exploited in direction-finding sonar. Dr Simon Dible Applied Signal Processing Research Group Loughborough University Loughborough UK s.a.dible@lboro.ac.k