APPENDIX. 
145 
Order II. CORNEA. 
The polypes covered with a horny flexible external case, forming 
a massive or arborescent polypidom. 
a. The body of the polype adnate to the cell. 
Fam. 2. Pedicellinid,®, p. 93. 
Polypidom creeping, sending forth club-shaped cells ; tentacles 
numerous, contractile (not retractile) into the cells. 
B. The body of the polype separate from the parietes of the cell. 
Fam. 3. Vesiculariad,®, p. 94. 
Polypidom confervoid, homy, fistulous, continued, not jointed ; 
polype cell tubular, cylindrical, deciduous. 
Fam. 4. Cristatellid,®, p. 99. 
Polypidom tubular, not jointed, often united together into a 
mass ; polype cells cylindrical, tubular, permanent. 
Fam. 5. Paludicellaid.®, p. 102. 
The polypidom confervoid, jointed ; polype cells ovate, with a 
roundish rather tubular lateral subapical aperture, all opening 
on one side of the polypidom. 
c. The polypes covered with a coriaceous external case, which is 
thicker on the sides and underpart and thinner above ; opening 
of the cell subapical, linear, transverse. 
Fam. 6. Flustradje, p. 103. 
Polype cells placed side by side, forming an expanded crust on 
rocks, or continued frond, bearing cells on one or both of its 
sides ; ovicells numerous, subglobose. 
a. Interspaces between the cells coriaceous. 
1. Flustra, p. 103. 
Coral frondose, expanded, forked, with cells on both sides, or 
crustaceous, applied to marine bodies ; cells ovate, six-sided, 
broad above, narrower below, semi-alternate with scattered mar- 
ginal denticles ; ovarial cells globular. 
2. Ciiartella, p. 104. 
Coral frondose, expanded, lobed, with cells on both sides ; 
cells linear-oblong, in many series, with smooth edges. 
G 
