THE DEEP-WATER SWIMMING CRABS OF THE GENUS BENTHOCHASCON (DECAPODA: BRACHYURA: PORTUNIDAE), WITH DESCRIPTION OF A

The taxonomy of the deep-water portunid genus Benthochascon Alcock and Anderson, 1899, is reappraised. Benthochascon is now restricted for its type species from the Indo-West Pacific, Benthochascon hemingi Alcock and Anderson, 1899. Benthochascon schmitti Rathbun, 1931, from the Gulf of Mexico, is referred to a new genus, Raymanninus, which differs from Benthochascon s. str. in the the form of the anterolateral margin, first and third maxillipeds, chela, and structure of the fourth male thoracic sternite.