REPORT ON THE POLYZOA. 
XVll 
C. The lower border may be 
1. Entire, sinuous, or straight. 
2. Mucronate. 
3. Emarginate. 
4. Dentate. 
5. Bidenticulate. 
6. Incised. 
D. The peristome may be 
1. Thin or thick. 
2. Elevated, produced or level. 
3. Armed with oral spines, either rigid or articulated 
4. Unarmed. 
III. Special pores may be present on the front of the zooecia, and are 
1. Lunate — crescentic and usually fimbriated. 
2. Simple — circular and either (a) suboral or labial, formed by the constriction of a notch 
in the lower lip ; or (b) central, independent of the orifice. 
IY. The Ocecia may be 
1. Erect or recumbent. 
2. Front entire, fissured, or punctured. 
3. Cucullate — when the front is widely deficient. 
4. Stigmate, with a trifoliate or circular bordered mark or space (stigma) in front. 
V. Special Organs. — Under this head are included 
vibracular organs. 
all forms of avicularian and 
A. Avicularia, may be 
1. As to form — 
(a) Pedunculate and usually articulate. 
(b) Sessile. 
(c) Immersed. 
(ZOOL. CHALL. EXP. PART XXX. 1884.) Gg C 
