THE METAMORPHOSIS OF ECHINODERMS. 181 
two groups, we seem to have a chain of evidence of their con- 
nection, which though not indeed conclusive—that, embryolo- 
gical evidence alone can never be—is at least as strong as that 
which binds together any two of the great subdivisions of the 
Animal Kingdom. 
15. 
16. 
LT. 
LITERATURE. 
. Acassiz, A.—‘ Embryology of the Starfish,” ‘Contrib. Nat. Hist. U.S.,’ 
vol. v, 1864. 
. Barranpe, J.—‘Systéme Silurien du centre de la Bohéme,’ vol. vii, 
Prague, 1887. 
. Bateson, W.— Materials for the Study of Variation,’ London, 1894. 
. Bory, H.—‘‘The Early Stages in the Development of Antedon 
rosacea,” ‘ Phil. Trans. Roy. Soc.,’ London, 1888, vol. clxxix. 
. Bury, H.—“Studies in the Embryology of Echinoderms,” ‘ Quart. 
Journ. Mier. Sci.,’ April, 1889. 
. Birscuut, O.—‘ Versuch der Ableitung des Echinoderms aus einer 
bilateralen Urform,” ‘ Zeitsch. f. w. Zool.,’ vol. liii, suppl. 
. Cuinor, L.—“ Etudes Morphologiques sur les Echinodermes,” ‘ Arch. de 
Biologie,’ vol. xi, 1891. 
. Frevp, G. N.—“ The Larva of Asterias vulgaris,” ‘Quart. Journ. 
Mier. Sci.,’ vol. xxxiv, pt. 2, p. 105, 1894. 
. Gottr, A.—“ Vergleichende Entwicklungsgeschichte der Comatula 
mediterranea,” ‘Arch. f. Mikros, Anat.,’ vol. xii, p. 583, 1876. 
. H&rovarp, E.—“ Recherches sur les Holothuries des Cétes de France,” 
‘Arch. Zool. Exp. et Gén.,’ vol. vii, 2 ser., 1889. 
. Lovin, S.—* Etudes sur les Echinoidées,” ‘Kéngl. Svenska Vetensk- 
Akad. Handlungen,’ Bd. ii, No. 7, Stockholm, 1875. 
. Loven, S.—‘ Echinologica,’ Stockholm, 1892. 
. Lupwiec, H.—“ Beitriige zur Anatomie der Asteriden,” ‘ Morph. Stud.,’ 
vol. i, p. 150, Leipsic, 1877. 
. Lupwic, H.—‘ Ueber den primaren Steinkanal der Crinoideen,” &c. - 
‘Morph. Stud.,’ vol. ii, p. 34, Leipsic, 1880-82 (and ‘ Zeitsch. f. wiss. 
Zool.,’ vol. xxxiv, p. 310, 1880). 
Lupwie, H.—‘‘Entwicklungsgeschichte der Asterina gibbosa,” 
‘Morph. Stud.,’ vol. ii, p. 3 (and ‘Zeitsch. f. wiss. Zool.,’ vol. xxxvii, 
1882). 
Lupwiec, H.— Zur Entwicklungsgeschichte der Holothurien,” ‘Sitz- 
ungsberichte d. Kongl. Preuss.Akad. d. Wissenschaften,’ 3, Berlin, 1891, 
pt. i, p. 179. 
Lupwic, H.—‘‘ Zur Entwicklungsgeschichte der Holothurien,” ‘Sitz- 
ungsberichte d. Kéngl. Preuss. Akad. d. Wissenschaften,’ 3, Berlin, 
1891, pt. ii, p. 608, 
