From the introduction:
"This is the fourth contribution in the series entitled Additions to the Copepods Parasitic on the Marine Fishes of India. In all, twenty six caligids belonging to the genera Caligus, Sciaenophilus, Pseudopetalus. .Lepeophtheirus, Hermilius, Anuretes and Pseudanuretes are described. Ten species, which are new, are fully illustrated and described. In describing the known species emphasis has been placed on additional details observed by us and in correcting and supplementing earlier descriptions."