[111] The Anatomy of Invertebrated Animals, p. 519.
[112] Ussow states that they are independent.
[113] For a fuller account of this subject the reader is referred to the chapter on ‘The Development of the Eye.’
[114] Rabl holds that there is no contractile dorsal sinus, but that the appearance of contraction there is due to the contractions of the foot.
[115] I conclude this from Bobretzky’s figures.
[116] The following description applies specially to Loligo.
[117] In Loligo only a single pair of salivary glands is present.