Sacculina beauforti and Loxothylacus ihlei, two Rhizocephala of the Crab Scylla serata (Forsk.)

With great pleasure I dedicate the two new species described below to the two Amsterdam zoologists Prof. L. F. DE BEAUFORT and Prof. J. E. W. IHLE, who with their important researches in various branches of zoology both have so largely contributed to the progress of this science. The two species described here are parasites of Scylla serrata (Forsk.); they are the only specimens until now known to infest this species of Portunid crab.