202 
EDWIN S. DOODEICII. 
10. Laiikcster, E. R., and Willey, A.— “ The Development of the Atrial 
Chamber of Amphioxus,” ‘ Quart. Journ. Micr. Sci.,’ vol. 31, 1890. 
11. MaeBride, E. W. — “The Early Development of Amphioxus," ibid., 
vol. 40, 1898. 
12. Schneider, K. C. — ‘Lehrhuch des Vergl. Histologie,' Jena, 1902. 
13. Weiss, F. E. — “Excretory Tubules in Amphioxus,” ‘Quart. Journ. 
Micr. Sci.,’ vol. 31, 1890. 
14. Wljhe, J. W. van. — “ Beitr. z. Anat. des Kopfregion des Am- 
phioxus,” ‘Petrus Camper,’ vol. 1, 1901. 
15. Willey, A. — “ The Later Larval Development of Amphioxus,” 
“Quart. Journ. Micr. Sci.,’ vol. 32, 1891. 
16. Legros, R. — “ Sur le dcvel. des fentes hranchiales et des canalicules 
de Weiss-Boveri cliez I’Amphioxus,” ‘Anat. Anz.,’ Bd. 34, 1909. 
Published anonymously. 
List of Refkkence Letters. 
a. c. and «. ep. Atrial epithelium, ao. Aorta, h. Secondary gill-har. 
b. c. Buccal cavity, b. ep. Epithelium of buccal cavity, hr. Brain. 
br. c. Branchial eiiithelium. bv. Blood-vessel. cii. Cavity in whicli 
runs Hatschek's nephridium. c. ep. Coelomic epithelium, c. gl. Club- 
shaped gland. ch. Solenocyte chamber. cr. Cirrhus. c. w. Cut 
wall of nephridial canal, d. n. Dorsal nerve, e. <j. s. Edge of gill- 
slit. e. m. Margin of mouth. end. Endostyle. c. op. External oijen- 
ing of club-shaped gland, cp. Ejjidermis. fl. Flagellum, g. Glandular 
area. g. m. Branchial muscle, g. s. i— Gill-slits. gt. Wall of 
gut. h. c. Pre-oral head-cavity. H. ncph. Hatschek’s nephridium. 
ibw. Inner blood-vessel, i. op. Internal opening of club-shaped gland. 
I. Lumen of nephridial canal. 1. p. Lower margin of mouth, 'lucl. 
Myocojle. mt. i— -. First and second myotome. vit.f. Metapleural 
fold. my. Myotome, n. Wall of neidiridial canal, negdi. Nephridium. 
II. c. Nerve cord. ne. Nerve from left side. id. Notochord, oji. 
External opening of nephridium. pi). Peripharyngeal ciliated tract. 
p. III. Pre-oral muscle, p. o. m. Anterior oral muscle, p. t. m. Pos- 
terior oral muscle, sol. Solenocyte. s. s. Pre-oral sense-organ, t. and tb- 
Tul)e of solenocyte. up. Upper margin of mouth, v. Velum, v. b. v. 
Ventral l)lood- vessel now on right side. vt. Velar tentacle. 
