EMBRYOLOGICAL MONOGRAPHS. 
Development of Crinoipea (Comatula). 
1-9. 
10- 26. 
27 -35. 
6 de 
SS 
, 3, 4, 
’ 
1 
2 
6 
8 
? 
3 
7 
9 
PALAU ie 
Figures from C. Wrvitts THomson and ALEXANDER 
GOETTE. 
Comatula rosacea. From C. Wyville Thomson, On the Embryogeny of Antedon rosaceus Linck (Coma- 
tula rosacea of Lamark), 1863. Trans. R. S. London, CLY., 1865, Pls. XXIII.-XXVII. 
Comatula mediterranet. From Alexander Goette, Vergleichende Entwickelungsgeschichte der Coma- 
, XXXVI. Archiv fiir Microskop. Anat., XII. 
Comatula rosacea. From C. Wyville Thomson, On the Embryogeny of Antedon rosaceus, quoted above. 
tula mediterranea, 1876, Pls. XXXV. 
1-9. Comatula rosacea. 
shortly after impregnation. 
5. Different stages of segmentation. 
10-26. Comatula mediterranea. 
aa._ Gastrula axis. 
af. 
bb. 
Up. 
Tp. 
Mm. 
m d. 
mt. 
ob. 
ob! 
Anus. 
Longitudinal axis of the gastrula. 
Gastrula mouth. 
Intestine. 
(sophagus. 
Base of the stem of the Comatula Jarva. 
Plate of base of stem. 
Left peritoneal sac (oral body cavity). 
Oral chamber. 
Mouth. 
Mesoderm. 
Mesentery. 
Outer skin. 
Yellow cells of the same. 
ot. 
p. 
10. Median section through a young larva (gastrula form). 
11. Median section through a somewhat older larva. 
12-15. Frontal sections of successively older larve, seen from the dorsal side. 
16. Transverse section of a similar larva, anterior plane. 
17, 18. Sagittal sections; the median section is indicated in outline. 
19. Median sections of a somewhat older larva. 
20. Frontal section, seen from the ventral side ; the perisome begins to be intimately united with the outer skin 
and the parietal plate. 
From C. Wyyille Thomson. 
. Development of the pseudembryo within the vitelline membrane. 
. Dorsal and ventral aspects of the pseudembryo shortly before the disappearance of the ciliated bands. 
From A. Goette. 
Oral funnel. 
Perisome. 
Circular canal. 
. Right peritoneal sac (aboral body cavity.) 
. Continuation of the same into the stem. 
Stem of the young Comatula larva. 
Skeleton of the stem. 
Contractile tentacle. 
Non-contractile (rigid) tentacles. 
Visceral plate. 
. Its continuation between the intestine and the 
water-system. 
Water-system. 
Stone canal. 
. Cords of vibratile cilia. 
