Slide showing drawing of 'Poison apparatus of rattle snake'. Slide shows black and white drawing of 'Poison apparatus of rattle snake'. Diagram has descriptive label reading, 'Fig 18 - Poison apparatus of rattle snake; venom gland and muscles. Lateral view. a - venom gland; a' - venom duct. b - anterior temporal muscle. b' - mandibular portion of same. c - posterior temporal muscle. d - digastricus muscle. e - posterior ligament of gland. f - sheath of fang. g - middle temporal muscle. h - external pterygoid muscle. i - maxillary salivary gland. j - mandibulary salivary gland. (After Duveroy)'. Small round sticker upper left reads '21'. Small round sticker upper right reads '89'. Number '41' written in ink on tape on top edge of slide. Late 19th - early 20th century