Corrections to Hjalmar Ditlevsen: Marine freeliving Xematode: from Danish waters. Ur. de Alan and Dr. R. .N\ e n z e ! have kir.d'v caKed my at- jntion to the faet that the generic names Bathyla:::.::s :.r.z Macro- !aimus are preoccupied. I therefore beg to change rhem as follows: Bathylainms into Ascolaimiis and Macrolaimus inro Cothono- laimus with C. inermis as the t>'pe-specie5. 27—3—1919. Hjalmar Ditlevsen.