— 21 — 
tentacles there is seen a thin single series of colourless needles, ex- 
tending from the base and almost to the point. Between the po- 
lypcells the zooids are situated in groups, consisting of three indivi- 
duals or singly, which latter case is the most frequent. The lateral 
zooids without much regularity, but there are also seen sloping series 
of 3 — 4 zooids, proceeding from the dorsal to the ventral side, or 
groups of 3 zooids, in same manner as the zooids between the po- 
lyps. The zooids are small, oval, with a round oral aperture and 
are not souronded by spicules. The ventral surface round, bare, 
1.5 mm. broad, at each of its sides the zooids, previously spoken 
of, are observed. The sarcosoma thick, sparingly furnished with co- 
lourless spicules, especially in the stalk, which has very small needles. 
The needles are most numerous in the cells. In the cells and rachis 
they are 0.133 mm. long 0.018 mm. broad. In the tentacles the 
needles are 0.020 mm. long 0.007 broad. Axis round, shorter 
than the whole seepen, terminating below obtusely, 0.15 mm. thick. 
The seepen redishbrown. 
Stichoptilum n. gen. 
Seapens of the family of the Protoptilidæ, Kolliker. The polyp 
with cells sessile, disposed on each side of the rachis in two single 
rows. The outer row with fullgrown polyps, the inner with rudi- 
mentary polyps. The cells cylindrical with eight, little prominent, 
spines. The zooids small, in three single rows, an inner row in the 
dorsal midline, the outer rows, one on each lateral surfaces of rachis. 
The rachis round, pointed straight at both ends. Calcareous cor- 
puscles in the stalk, rachis, cells and the tentacles of the polyps. 
Stichoptilum articum n. sp. 
Tab. VIII flg. 4, 5, Tab. IX. 
Small, rachis much longer than the stalk. The stalk with a 
small terminal bulb, narrowest in the upper end next to the rachis. 
Rachis round, stifif, 2.5 mm. broad. The ventral side bare, smooth. 
The fullgrown polypcells sessile, with eight little prominent spines, 
1. 1 mm. in length. The rudimentary polypcells sessile, like thick 
conical nodes, 0.3 mm. in length. The fullgrown polyps without 
