240 
G. L. PURSER. 
nection with the veins from the intestine and to the liver 
respectively. The arterial supply of blood develops from the 
coeliac artery rather later. 
(4) The organ remains throughout ontogeny embedded in 
the sheath of the foregut, and is therefore inconspicuous. 
Bibliography. 
Brvce, T. H. — “ The Histology of the Blood of the Larva of Lepido- 
siren paradoxa,” ‘ Trans. Roy. Soc. Edin.,’ vol. xli, p. 454, 
1904. 
Kerr, J. Graham. — “Notes on Certain Features in the Alimentary 
Canal of Lepidosiren and Protopterus,” ‘ Quart. Journ. Micr. Sci. r 
vol. liv, p. 484, 1909. 
Lagtjesse, E. — “ Recherches sur le developpement de la Rate chez les 
poissons,” ‘Journ. de l’Anat.,’ vol. xxvi, pp. 345-406 and 425-495, 
1890. 
Parker, T. J. — “ The Blood-vessels of Mustelus,” ‘ Phil. Trans. Roy. 
Soc. Lond.,' vol. clxxvii, pt. 2, 1886. 
Parker, W. N. — “The Anatomy and Physiology of Protopterus 
annectens,’* ‘ Trans. Roy. Irish Acad.,’ vol. xxx, pt. 3, 1892. 
EXPLANATION OF PLATES 15, 16, and 17, 
Illustrating Mr. G. L. Purser's paper on u The Early Develop- 
ment of the Spleen of Lepidosiren and Protopterus." 
All these figures have been drawn with the aid of a Zeiss Abbe 
drawing apparatus. I have to thank my sister, Miss Dorothy Purser, 
for making the diagrammatic drawings forming Plate 1 5. 
List of Abbreviations. 
ao. Dorsal aorta. er. Erythroblasts. /. g. Foregut. g. b. Gall- 
bladder. g.b.d. Bile-duct. h.p. v. Hepatic portal vein. int. Intestine. 
int.v. Intestinal vein, i.v.c. Inferior vena cava. k. Nepliridial tubes. 
li. Liver, lu. Lung. pa. Pancreas, sp. Spleen, sp. a. Splenic artery. 
tr. Trabeculae, v.s. Yenous sinus. 
