On a Pycnogonid of the genus Halosoma

Being engaged on a re-examination of the holotypes of Australian Pycnogonida described by Haswell in 1885, I have found it necessary to supplement the material available by collecting at the localities mentioned in Haswell's paper. During one of these excursions recently to Shark Island, Port Jackson, I obtained a Pycnogonid which could without any difficulty be referred to the genus Halosoma defined by Cole in 1904 (2). I have, therefore, taken the opportunity of describing this new species, and of discussing the position of the genus Halosoma.