File:Anson1934 fig01-8.jpg

• 1 - 2.4 mm. (CR), H.E.C. (loan) sectioii 28. Auditory pit (see level in model, figure 9.
• 2 - 3.75 mm., H.E.C. 2085, section 159. Auditory pit.
• 3 - 4 mm., 714, section 11. Auditory vesicle in contact with the epidermis.
• 4 - 4 mm., 2302, section 12. Auditory vesicle collected with the ectoderm by a solid placodal stalk (see level in model, fig. 10).
• 5 - 6.3 mm., 2300, section 67. Placodal stalk now ruptured (see level on fig. 11).
• 6, 7, 8 - 6.7 mm., 2285, sections 71, 72, 73, respectively. Remnants of placodal stalk of attachment persist 011 both the endolymphatic appendage and the epidermis (see level, section 72, in models, figs. 13 and 14).

a.p., auditory pit a.v., auditory vesicle (otocyst) c.d., cochlear duct coch., cochlear part of vesicle e.ap., endolymphatic appendage e.d., endolymphatic duct e.pr., eiidolymphatic projeetion e.s., endolymphatic sac ep., epidermis l.s.d., lateral semicircular duct m.t., medullary tube plac., placodal stalk sacc., saccule s.s.d., superior semicircular duct utr., utricle vest., vesibular part of vesicle