ON THE ANATOMY OF DISTICHOPORA. 59 
Fam. Stry.asTerips. Gray. 
Pores sporadic or not in cyclo-systems. Gastropores with 
styles. Dactylopores without them 
AA. Dactylopores of one kind only. 
Genus Sporapopora. Moseley, 1878. 
Pores of both kinds simple. Gasterozooids with four tentacles. 
Polypora. Moseley, 1876. 
Genus Piioporurus. Pourtales, 1871. 
Dactylopores at the tips of tubular projections.  Gastrozooids 
without tentacles. 
Genus Errina. Gray, 1835. 
Gastropores sometimes covered with a projecting scale. Dac- 
tylopores within nariform projections. 
Genus Disticuopora. Lamarck, 1816. 
Pores simple in a triple linear row at the lateral edges. 
actylopores of two size 
Genus Lapropors. Moseley, 1878. 
Larger dactylopores within nariform projections arranged in 
regular rows. Smaller dactylopores at the sides of these. 
Genus Sprnipors. Moseley, 1878. 
Larger dactylopores within long spine-like se ane Smaller 
dactylopo ain simple cavities at their bases. | Gastrozooids with 
ntac 
B. ive occurring in regular cyclo-systems only. Styles present 
in both kinds of pores ora pe 
BB. kinds of pores with styles. Gastrozooids with ten- 
' Genus Attopora. Eherenberg, 1834. 
cacy losystems budding from one another somewhat irregularly. 
Gasterozooids with twelve tentacles. 
Genus Srynaster. Gray, 1831. ae 
- Corallum increasin g regular alternate gemmation 
: cyclo-systems from Bip sont Gasterozooids with cight tom 
5 =< ERA: Biples alsant gasterozooids without tentacles. Gastero- 
‘Pores with two chambers, 
