150 Sponges. 
bose; concave now and then, and with large, irregular opet- 
ings, as if large branches were anastomosed ; circumference 
branched or lobed, very jagged, sinus obtuse, lobes elongated 
obtuse, truncate or flat, unequally divided. The substance is 
entirely of a cinereous white, outside and inside, of a soft and 
brittle nature, rather friable ; covered outside with minute 
_ pores, of an oblong or round shape, and full of small unequal 
cells inside. 
2. Sponga ostracina, Raf. (Oyster sponge.) Very branch- 
ed, erect, red, papillose ; branches unequal, often dichotome, 
obtuse; cells porose, oblong, nearly equal. 
It is often found on the common oyster. (Ostrea virginica.) 
It rises from four to six inches, the colour is a fine red, it bran- 
ches from the base; the branches are unequal, straight, cylia- 
drical, or compressed. Substance stupose. Surface cov 
with small papilla and small oblong unequal pores. 
3. Spongia cespitosa, Raf. (Bushy sponge.) Branched, ces- 
pitose, yellowish, rough, papillose ; branches fasciculated, up- 
right, unequal, flexuose, compressed, slightly anastomosed, 
nearly dichotome upwards; cells porose, oblong, nearly eq 
margin lacerated. 
Found also on the oyster, but more seldom than the foreg” 
ing; the specimens which I saw, were found on the Bluepoint 
oysters, by Dr. Eddy. It becomes brown by drying: It rises 
from four to six inches, the magin of the cells or pores is torn 
into papillar, stiff processes, which produce a rough surface. 
Substance stripose. Internal cells oblong, very small, 
4. Spongia cladonia. (Cladonian sponge.) Branched effuse, 
smooth, pale fulvous, stem procumbent, branches distichal, one 
sided, erect, simple or divided, obtuse ; cells porose, minute; 
some larger round. 
I have found this species at Bath, and at Sandy-Hook, 0 
sandy bottoms. Length about six inches. Stem and branches 
cylindrical or compressed. Substance fibrose, anasto 
branches divaricate, ascendent, semi-dichotomose oF simple 
unequal, thicker towards the top. 
5. Spongia virgata. (Slender spone.) Nearly branche 
smooth, fulyous, stem divided, slender, cylindrical, knobby 
