agnathous

The mouth is a transverse slit, which shows no teeth, nor any jaws properly so called, and therefore affords an apparent support to the agnathous theory of the Ostracodermi.

1900, Ramsay Heatley Traquair, “Notes on Drepanaspis Gmündenensis, Schlüter”, in Geological Magazine, page 158

This and related agnathous (jawless), finless forms inhabited shallow seas or estuarine habitats[…].

1997, Gene S. Helfman, The Diversity of Fishes, Blackwell Science,, →ISBN, page 152

Parenthetically, this line treatment suggests an attempt to mimic the agnathous (jawless) head, if we suppose that the jaw area was colored suitably dark in contrast to the face proper.

2007, James Brown, “Sequencing the Braden Style within Mississippian Period Art and Iconography”, in Ancient Objects and Sacred Realms, University of Texas Press, →ISBN, page 235

Dr Underhill exhibited an agnathous and hydrocephalic fœtus. This was an instance of the rare abnormality due to defect of the lower jaw.

1886, “Exhibition of Specimens: Meeting V”, Transactions of the Edinburgh Obstetrical Society, volume 11, page 79

Upon this view an agnathous fœtus may be regarded as sometimes due to a posterior dichotomy, which has ultimately become a complete separation, and in which the two fœtuses have developed equally during a considerable part of intra-uterine life.

1893, “Proceedings of the Anatomical Society of Great Britain and Ireland: November 1892”, Journal of Anatomy and Physiology, volume 27, page xvii