Diagnosis: Tentacles 15. Body elongate, flattened ventrally, arched dorsally. Midventral radius naked. Lateroventral radii each with approximately 50 narrow, elongate pedicels arranged in a single, often apparently double series. Dorsal radii each with about ten small retractile processes, regularly spaced. Deposits include wheels, circular perforated plates and spinous rods. Wheels and plates tend to be aggregated into scattered heaps on the dorsal side of the body.

Type Species: Bathygone papillatum Pawson.

Remarks: This genus differs from the others in Family Laetmogonidae in possessing peculiar heaps of calcareous deposits in the dorsal side of the body. Also the extremely numerous circular plates, while not unique to this family, are usually found in the papillae or pedicels, and are rare elsewhere.

Bathygone seems most closely related to Laetmogone Theel, differing from that genus in the smaller size of the dorsal papillae, and in the absence of accessory rods and cross-shaped deposits. Bathygone differs from Benthogone Koehler in having smaller ventrolateral processes, and more than one type of deposit in the bodywall.

Bathygone papillatum Pawson

Bathygone papillatum Pawson, 1965b, p. 77, figs. 7–11.

Material Examined: Marine Dept. Stn. 20, 7 specimens.

Remarks: This species has already been discussed elsewhere (Pawson, 1965b).