Swinnerton (Quart. J. Micr. Sci. xlv. 1902, p. 554) has pointed out that the skull of the Scombresoces belongs to what he terms the Acrartete type (i.e. in which the attachment of the palatine cartilage or its derivates is confined to the pre-ethmoid cornua), whilst the other Percesoces examined by him, as well as the Cyprinodonts are Disartete (the attachment being at the parethmoid and pre-ethmoid cornua); but the character is so indistinctly defined in some adult Cyprinodonts that I feel some diffidence in making use of this character for systematic purposes in the present state of our knowledge.

[707]

Kükenthal, Abh. Senck. Ges. xxii. 1896, p. 9; Möbius, Zeitschr. wiss. Zool. xxx. Suppl. 1878, p. 343, and Arch. Physiol. (Leipzig), 1889, p. 348; Jordan and Evermann, Fish. N. Amer. p. 730.

[708]

A revision of these fishes has recently been published by C. T. Regan in Ann. Mag. Nat. Hist. (7) x. 1902, p. 115.

[709]

Rec. Austral. Mus. iv. 1901, p. 40. Cf. also S. Garman, Bull. Labor. Univ. Iowa, iv. 1896, p. 81.

[710]

Ann. Mag. Nat. Hist. (7), x. 1902, p. 295.

[711]