In 1818, Dr. Samuel Latham Mitchill, receiving a specimen from below New Orleans, thought it different from _tricornis_ and _quadricornis_ and called it _Ostracion sexcornutus_; Dr. Holard, of Paris, in 1857, named a specimen _Ostracion maculatus_, and at about the same time Bleeker named two others from Africa which seem to be the same thing, _Ostracion guineensis_ and _Ostracion gronovii_. Lastly, Poey calls a specimen from Cuba _Acanthostracion polygonius_, thinking it different from all the rest, which it may be, although my own judgment is otherwise. This brings up the question of the generic name. Among trunkfishes there are four-angled and three-angled kinds, and of each form there are species with and without horns and spines. The original _Ostracion_ of Linnæus we may interpret as being _Ostracion cubicus_ of the coasts of Asia, a species similar to the _Ostracion rhinorhynchus_. This species, _cubicus_, we call the type species of the genus, as the Nagg's Head specimen of Artedi was the type specimen of the species _quadricornus_, and the one that was used for Lister's figure the type specimen of _tricornis_. _Ostracion cubicus_ is a four-angled species, and when the trunkfishes were regarded as a family (_Ostraciidæ_), the three-angled ones were set off as a separate genus. For this two names were offered, both by Swainson in 1839. For _trigonus_, a species without horns before the eyes, he gave the name _Lactophrys_, and for _triqueter_, a species without spines anywhere, the name of _Rhinesomus_. Most recent American authors have placed the three-cornered species which are mostly American in one genus, which must therefore be called _Lactophrys_. Of this name _Rhinesomus_ is a synonym, and our species should stand as _Lactophrys tricornis_. The fact that _Lactophrys_ as a word (from Latin _lætus_, smooth; Greek ~ophrys~, eyebrow; or else from _lactoria_, a milk cow, and ~ophrys~) is either meaningless or incorrectly written makes no difference with the necessity for its use. [Illustration: FIG. 241.--Spotted Trunkfish, _Lactophrys bicaudalis_ (Linnæus). Cozumel Island, Yucatan.] [Illustration: FIG. 242.--Spotted Trunkfish (face view), _Lactophrys bicaudalis_ (Linnæus).]