Notes on Some Indo-Pacific Pontoniinae. XI. A Re-Examination of Philarius Lophos Barnard, with the Designation of a New Genus, Ischnopontonia

Specimens of a pontoniinid shrimp from East Africa, the western Indian Ocean, and the Malayan Peninsula are described. The specimens are placed in a new genus lschnopontonia and reasons are given for removing the species from the genus Philarius Holthuis, in which they had originally been placed as P. lophos by Barnard. The new genus is considered to be most closely related to Anapontonia Bruce and the differences betwee the two genera are listed. The data at present available on morphological variation, ecology, and distribution are given and a key for the separation of related genera is provided.