182 ZOOLOGY 
No nephridium has been described in Plumatella; in an 
allied form, Cristatella, a pair of ciliated tubes are, however, 
said to lead from the body-cavity and to open by a common 
pore between the anus and brain. The interpretation of these 
Fic. 115.—View of right half of Pluwma- 
tella fungosa, slightly diagrammatic. 
After Allman and Nitsche. 
. Lophophore. 
. Mouth. 
. Epistome. 
Anus. 
. Nerve ganglion. 
. Oesophagus. 
NIaoa rp wn Fe 
. Stomach. 
. Rectum. 
. Edge of fold of body-wall. 
. Wall of tube. Ectocyst. 
. Parieto-vaginal muscles. 
co 0 
a 
So 
—VOO Oo 
jt ft 
SS) ie 
. Funiculus. 
— 
co 
. Body-wall. Endocyst. 
. Testis. 
. Testis, more mature. 
16. Statoblast. 
17. Ovary. 
18. Spermatozoa free in body-cavity. 
19, Calyx. 
20. Retractor muscle. 
et 
oe 
ducts is a subject of uncertainty. The functions of a renal 
apparatus may possibly be delegated to those large cells in the 
stomach in which brown granules accumulate during the life 
of the polypide. 
Plumatella is hermaphrodite. The ova develope from the 
cells which line the body-wall, near the anterior end. The 
testes are formed from cells covering the upper end of the 
funiculus; these cells multiply, and become spermatozoa. 
The cells of the funiculus at its lower end give rise 
