DR. A. FARRE ON THE STRUCTURE OF THE CILIOBRACHIATE POLYPI. 423 
showing 1 a regular gradation in growth. The apertures are seen 
left by the falling off of the cells, and below them the apparent line 
of connexion. The stem occupied by granules. 
Fig. 3. X 100. The animal expanded (not very perfectly). The arms and alimentary 
canal short compared with the former species. The gizzard and 
other parts the same. The parietes seen separated from the cell at a. 
Fig. 4. A similar animal in the act of protruding. 
Fig. 5. Another completely retracted. The parietal granules seen in each of 
these figures. 
Fig. 6. A young animal. 
Fig. 7- Upper half of a cell, showing the setae. 
Fig. 8. Two animals, showing the various muscles. 
a. Gastric retractors. 
b. b. Tentacular retractors, 
c. c. c. Parietal muscle. 
d. d. d. d. Opercular retractors. 
Plate XXIII. p. 402. 
V alkeria cuscuta. 
Fig. 1. Natural size. Growing on Ceramium, like Dodder. 
Fig. 2. X 6. A similar portion separated. 
Fig. 3. X 40. Two portions showing the arrangement of the cells. At a in groups 
surrounding the stem, and sessile. At b raised upon short branches 
from each joint. On a portion of Ceramium. 
Fig. 4. X 100. Group of animals. 
a. Expanded 
b. Retracted. 
This figure shows also the opercular retractors, the brown body and 
the parietal granules. These two latter are also seen in the cell c, 
which in other respects is empty. 
Fig. 5.X 250. Single animal magnified to show the cercariae in the cavity of the 
body. 
g. Separate cercariae. 
a. Tentacula. 
b. Line in the pharynx. 
c. Stomach. 
d. Pylorus. 
e. Rectal enlargement of intestine. 
f. Operculum protruding. 
