Venoms : venomous animals and antivenomous serum-therapeutics / by A. Calmette; translated by Ernest E. Austen.

  • Calmette, A. (Albert), 1863-1933.
Date:
1908
Catalogue details

Licence: In copyright

Credit: Venoms : venomous animals and antivenomous serum-therapeutics / by A. Calmette; translated by Ernest E. Austen. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    from 35—40 small, backwardly curved teeth ; the other internal, the palatine, which only numbers from 20—22 teeth, having the same curvature (fig. 1, a). In the poisojious snakes the maxillary bones are shorter, and the outei- row is represented by a single long and tubular or grooved tooth (the fang), fused with the maxillary bone, which is itself mov- able (fig. 1, B, c, D, E, F). Certain species (Dip- sas) have maxillary teeth which increase in size from front to rear; the longest teeth are grooved and serve for the better retention of prey, and also to impregnate it with saliva; but they are not in communication with the poison-glands. The poison-fangs are normally covered with a fold or capsule of mucous membrane, in which they are sheathed. This fold con- ceals a whole series of reserve teeth in different degrees of development, which eventually become attached to the extremity of the maxillary when the principal tooth falls out or is broken (fig. 2). Poison Apparatus.—The grooved or fur- rowed teeth in the Proteroglypha and the canaliculate teeth in the Solenoglypha are arranged, not for the purpose of seizing Fig. 2.—a, Maxillary bone and fangs of one of the Viperida (Vipera russcllii) ; b, maxillary bone and fangs of one of the ColubridcB {Naja trijm- dians); c, maxillary bone and fangs of one of the Cohihridce (Bungarus fasciakis); d, maxillary bone and teeth of one of the non-poisonous Cohc- bridce (Ptyas nmcosus). (After Sir Joseph Fayrer.) Pig. 3.—a, Fang of one of the Viperida (Vipera russellii); d, transverse sec- tion of the fang.