Phyllosoma duperreyi Guérin.

Phyllosoma duperreyi Milne-Edwards, Hist. Nat., Crust., 2, p. 485, 1837; Guérin-Méneville, Voy. de la “Coquille,” p. 46, pl. 5, fig. 2, 1838; Stebbing, Willey's Zool. Results, pt. 5, p. 609, 1900.

One specimen of this larval form was “cast up on Denham Bay Beach, Sunday Island, 31st May, 1908.”

It is 26 mm. long and 18 mm. broad, and agrees closely with the description and figures given in the “Voyage de la ‘Coquille.’”

It is not certainly known to what adult form Phyllosoma duperreyi belongs, but Professor Haswell, in describing the Phyllosoma stage of Ibacus peronii Leach [I. incisus Péron], says that it is not unlikely that Phyllosoma duperreyi is an earlier stage in the development of the same animal (Proc. Linn. Soc. N.S.W., 4, p. 280). His specimen was obtained at Port Jackson; the original specimen of P. duperreyi was obtained at the same place; while the one described by Stebbing is from Milne Bay, New Guinea.