IF the “singular fish of a deep black colour, with small eyes, and a most abyssal physiognomy,” noticed by Prof. Giglioli (NATURE, vol. xxv. p. 535) had been a Chiasmodon, that learned ichthyologist would doubtless have recognised it, and not suggested that “it may be allied to Malacosteus.” But in addition to the two specimens of Chiasmodon niger referred to by Mr. Johnson (NATURE, vol. xxvi. p. 453), it may interest ichthyologists to learn that a third specimen has been found off the New England coast (on the Le Have Bank). Like the others previously known it had engorged a fish several times larger than itself. The specimen is now in the U.S. National Museum. Chiasmodon, it may be added, is not at all related to the Gadidae, as has been supposed by Messrs. Gunther and Johnson, but is a true Acanthopterygian fish and the type of a peculiar family—the Chiasmodontidœ. [In Dr. Gunther's “system” it belongs to the heterogeneous family Trachinidœ.]