In Parasitology, vol. xv, p. 340 (20. ix. 1923), I described a genus of nematodes from the rabbit for which I proposed the name Obeliscus. Dr Paul Bartsch, of the Smithsonian Institution, has called my attention to the fact that this name is preoccupied, having previously been used for genera of Mollusca by Humphreys in 1797, by Agassiz in 1837, and by Beck in 1837. I therefore propose the new name Obeliscoides, type cuniculi, to replace Obeliscus Graybill, 1923.