2 
vee 
oe) 
- 
PLATE 4. 
Pennaria tiarella, page 7. 
The figures are from camera drawings finished by J. H. Emerton. 
Fig. 1. A very young hydranth showing the filiform tentacles and the most 
tentacles appearing first, the capitate in a verticil. x 40. 
Fig. 2. A somewhat older hydranth with the second verticil of capitate tentacles sh 
x 40. 
Fig. 3. A later stage with the capitate tentacles still in verticils. x 40. 
Fig. 4. A still older hydranth with the filiform tentacles eut away, showil 
tentacles now in an irregular arrangement, especially on the pro 
the hydranth. x 40. 
