194 MARINE INVERTEBRATES 
opening of the cell has no operculum. Ovicells, containing the 
embryos, appear like pear-shaped swellings. 
Genus Crisia 
C. eburnea. This species is found in tide-pools on alge, especially 
on the red seaweeds, growing in bushy tufts from one half of an inch to 
an inch high. Caleareous, with horny joints; cells in 
two rows, semi-alternate, cylindrical, free at one end, 
bent; no operculum; ivory-white; ovicells large and 
pear-shaped. Common from Long Island Sound north- 
ward and on the Pacific coast. 
Genus Tubulipora 
T. flabellaris. This species is found attached to 
slender branched alge, in coral-like masses of long, 
crooked, tubular cells united at the base and spreading 
into fan-shapes placed flat against the fronds. It is 
sometimes one quarter of an inch in diameter. On the 
same alga may often be found Crisia, Mollia, and Celle- 
pora. (Plate XLIX.) : 
Genus Diastopora 
Crisia eburnea; a -D. patina. Tubular cells rise from a saucer-shaped 
arch pearing evi’ disk about a quarter of an inch in diameter; cells lie 
Sane eee obliquely or stand erect, and are crowded toward the 
center; margin of disk without cells; colony white 
and calcareous. Found on alge and eel-grass from Long Island 
Sound northward. 
SUBORDER CHEILOSTOMATA 
In this suborder the zocecia are either horny or calcareous, and 
the orifices are usually surrounded with spines and have opercula. 
The orifices generally have raised margins, or peristomes. Ovicells 
form helmet-like coverings overhanging the orifices. 
GENUS Altea 
4. anguinea. Delicate, white, creeping, calcareous stems, from which 
rise numerous club-shaped cells, about one eighth of an inch high, each 
one with an aperture in the end. This species creeps in wavy lines 
along the fronds of algz, and is frequently found on Dasya, Griffithsia, 
Plocamium, and eel-grass. 
