some Spectes of Crisia. 475 
fig. 9, shows them free for a considerable distance ; however, 
this is not the case in Busk’s figure. - The ovicells are long, 
pyriform, with a tubular oceciostome, usually compressed, s0 
that it is much wider Jaterally (0°12 mm.). Specimens from 
Kola Bay, given to me by Dr. Kluge, have very long inter- 
nodes with as many as thirty zocecia ; in these specimens 
there may be branches after the second zececium, but more 
frequently not until the sixth to ninth on that side, and there 
may be also one, two, or three ae higher up. 
Specimens from Granville B ay, West Greenland, also 
given to me by Dr. Kluge, who had named both C. eburneo- 
denticulata, have not more than twenty- five zocecia to an 
internode, but some of these have a growing end, and so are 
not completed. In this the distance from zocecium to zocecium 
is about 0°5 mm., and in the Kola specimen is about 0-4 mm. ; 
the aperture of the zocecium is about 0:06-0:07 mm., the base 
of the internode is about 0°12 mm., the basis rami is long and 
the joints are light. 
A specimen which I named eburneo-denticulata, from Franz 
Josef Land, has shorter internodes, with the branches arising 
fiom after the first zocecium on that side; the basis rami 
is short, not reaching to the zoarium below; there are not 
above thirteen zocecia to an internode, but the general struc- 
ture is similar to other eburneo-denticulata, though approaching 
C. eburnea. There are, however, no ovicells. The number 
of pores in all is similar. 
Jn specimens in the Natural History Museum from 
Smeerenberg, Spitzbergen ; Rekiavie, Greenland; and Cas- 
trensis O@e, there are not more than eighteen zocecia to an 
internode, so that possibly the preseit form should be looked 
upon as a variety. There does not seem to be sufficient 
reason for separating tle present form generically on account 
of the contracted oceciostome, for in C. eburnea, in the Natural 
History Museum, I have seen a round and contracted ocecio- 
stome on the same e colony. 
The long forms in some respects resemble C. pugeti * 
Rob., but they are not identical. : 
The double name eburneo-denticulata is very unfortunate, 
as the species seems to belong to the eburnea group, and not 
ow) 
to the denticulata group. 1 have from Naples some long 
* “ Cyclost. Bry. of the North-west Coast of America,” Uniy. of Cali- 
fornia Pub. Zool. vol. vi. p. 244, pl. xx. figs. 20, 21 (1910). Dr. Alice 
Lobertson’s figures always give me the impression of being very well 
drawn and instructive, but they are reproduced by such an unsatisfactory 
method that the sharp outlines and details are lost. In my copy of this 
paper the details of the oceciostomes can in no case be made out, though 
evidently drawn sharply. 
