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distal part of the branches. The aperture, which is turned a little 
outwards «and  frontally, is provided with two" well-developed 
roundedly triangular lateral teeth and lacks an adcaulihe median 
projection. The bottom of the adcauline sinus is convex, and 
the short adcauline membrane is convex from side to side. 
The gonothecae are pyriform, smooth, and the short an- 
nular aperture is surrounded by 6—8 short spines. 
Of this species I have seen 8 cøolonies from Japan (33? 10' N. 
129? 18' E.), depth 38 fath. (Schån au). 
Sertularia intermedia n. sp. 
(Pl. IV, figs. 7—10). 
The colony, which has a height of 95 mm. is provided 
with a thin slender stem, presenting a number of indistinct inter- 
nodes with 6—12 branches. it is divided into a proximal half 
with simple alternate branches, and a distal half, the branches 
of which are -spirally arranged and composite, each being provided 
on each side with 3—5 branchlets, which gradually deerease in 
length towards the tip, and, therefore, these branches give the 
impression of being flabelliform. 
The hydrothecae which are alternate and divided. from 
each other by an interstice, which may attain the length of a 
half hydrotheca, are in the whole length of the colony provided 
with a distinctly obliquely ascending and gracefully outwards 
curved abcauline wall, and with a rather short free distal end. 
The aperture which is turned directly towards the margin of the 
colony, is provided with two broadly rounded, but low lateral 
teeth, and with a convex or indistinctly angularly bent sadcauline 
wall, the membranous portion of which is very low and indistinctly 
defined. 
The gonotheeae are pyriførm, and the short ring-shaped 
aperture is surrounded by 6—8 short spines. Besides the above 
described mature colony there are found two small (height 32— 
