10 EMBRYOLOGICAL MONOGRAPHS. 
11. Embryo after the formation of the mouth. A small cluster of cells, not represented in the figure, is 
represented in Kleinenberg’s figure just above the mouth. The tentacles appear in pairs, as hollow 
processes. 
12-22. Development of Candclabrum phrygium, De Blain. Myriothela phrygia, Fab.). From Allman, On the 
Structure and Development of Myriothela. Phil. Trans. Roy. Soc. CLXV., Pl. LVIL., figs. 1, 2, 3, 4; 
Pl. LVIII., figs. 1, 2, 4, 5, 6, 7, 8. 
12. Very young bud, which later forms a gonophore. eb. Epiblast forming a slight elevation. h0!. Accompany- 
ing hypoblastic prolongation into the epiblastic prominence. y. Cavity filled with granular protoplasm. 
c. Diverticulum from the chamber or cavity ef the blastostyle. : 
13. ‘More advanced stage (female); the gonophore has formed a very decided projection from the external 
surface of the blastostyle, and the gonogenetic chamber (u) has begun to show a differentiation in its 
contents.” Allman. ¢'. Epiblastic prominence above the surface of the blastostyle. 1b. Hypoblastic 
layer. gw. Gonogenetic chamber.- o. Diverticnlum from the cavity of the blastostyle. 
14. The female gonophore still more developed. mb. Membrane. yu. Gonogenetic chamber. o. Diverticulum 
from the cavity of the Dlastostyle. 
15. A gonophore older than the last. , 
The wall of the gonophore in a stage of the same, older than figure 15, is ruptured, and the contents 
escape. It (the portion escaping) is, however, grasped by a peculiar clasper, which holds fast to its ee 
by a sucker-like body, and certain changes take place while it is in this embrace. 
16. Planula. A segmentation about which there is little known las taken place, and the planula has an , outer 
layer (¢5), an inner layer (h), while a cavity (cav.) has been formed by the liquefaction of the central 
part of the mass. It is enveloped in a membrane (mb), and enclosed in a capsule, which is firmly held by 
the claspers. There are zo cilia. 
17. Embryo with minute pits (\) forming the orifices of invaginations of the wall of the planula, and enclosed in 
a capsule (cp). These invaginations are composed of two layers, and later, when reversed, form the pro- 
visional appendages (ta’). 
18. Embryo still enclosed in a capsule and held by the claspers, both of which SLES are not represented. 
The invaginated appendages (¢a’) have been turned outward. 
19. Embryo taken from a capsule in which small papille have begun to form at one end. These (ta) later elon- 
gate into the permanent tentacles. ¢a’. Provisional appendages. 
20. Embryo free from the capsule, which has begun to fasten itself at one extremity by a disk ({). 7. Position 
of the mouth. fa. Permanent tentacles. ¢a/. Transitory arms. } 
21. The larva permanently fastened, possessing permanent arms (fa), but destitute of transitory-appendages. 
22. Free, locomotive embryo (actinula), just after its escape from the capsule, and younger than the earliest 
attached condition (20). ta. Permanent arms. ¢a’. Transitory arms. ¢ Disk for fixation. 7. Mouth 
region. The arms are represented extended. When retracted, they have the form of ovoid bodies of small 
size. The larva remains in the actinula condition only a few days. 
