AIJTHOZOA. 
Coel. 23 
the tentacles of the polyps. M. willemoesi, South of Yeddo, p. 26, pi. vii. 
fig. 27. 
Leptoptilum^ g. n., also belonging to the Protoptilidce. Polyps with 
cells, sessile, disposed alternately in one single row on each side of the 
rachis ; cells cylindrical, with eight long spines ; no real zooids, but a 
certain number of rudimentary polyps between each pair of the full- 
grown individuals; axis round, pointed, and straight at both ends ; cal- 
careous corpuscles in the stalk, rachis, the cells, and the tentacles of the 
polyps. L. gracile, North-east of New Zealand, p. 27, pi. vii. fig. 28. 
Proptilum aherrans, p. 28, North Atlantic South of Now York. 
Trichoptilum, g. n., also belonging to the Protoptilidm. Polyps with 
cells, sessile, disposed alternately in one single row on each side of the 
rachis ; cells cylindrical, with eight strong spines ; zooids dorsal, one to 
three between the polyps, small, without spines ; axis quadrangular ; cal- 
careous bodies numerous in the cells and tentacles of the polyps, very 
scarce in the sarcosoma of the rachis, abundant in that of the stalk. T. 
brunneum, South-east of Ceram, p. 29, pi. viii. fig. 31. 
Scderoptilunij g. n., also belonging to the Protoptilidoi. Polyps without 
cells, sessile, with broad bases, disposed on each side of the rachis in a 
single row ; zooids dorsal, apparently in one row; axis round ; calcareous 
corpuscles of large size, abundant in the polyps and their tentacles and in 
the sarcosoma of the rachis, those of the stalk numerous, but smaller. S. 
grandijiorum^ p. 30, pi. vii. fig. 29, East of Japan, durissimum, p. 31, South 
of Yeddo. 
GoRGONIIDtE. 
Isis danai and var., p. 108, Naigh Nai, clongata^ p. 108, compressa, 
p. 109. Tandra Rahim Khan, Duncan, (6). 
Tubipora replans, Carter, (4) p. 152, Gulf of Manaar. 
Favositid^e. 
Beaumontia ? zignoi, D’Achiardi, (6) p. 261, Monte Alba. 
