[263] Sprengel Commentar. t. i. f. 1.
[264] Ibid. f. 10.
[265] Ibid. t. ii. f. 15.
[266] Malpigh. De Bombyc. t. iii. f. 3.
[267] Ibid. t. iv. f. 1.
[268] Lyonet Anat. 101.
[269] Lyonet Anat. 101.
[270] Sprengel (ubi. supr. 16.) says that he never found more than two; but as Lyonet affirms that he has very often separated them (102), his accuracy cannot be questioned.