Gatty Marine Laboratory, St. Andrews. 137 
are more or less agglomerated on stones or shells. Certain 
specimens have the branchiz coloured red at the extremitics 
—an accidental condition. The collar-bristles have the web 
at the base of the tip with large teeth (two or three prominent) 
and with a few capillary bristles. There is no operculum. 
The uncini have numerous teeth. He distinguishes S. dysteri, 
Huxley, from the foregoing by the numerous fine teeth on 
the basal web of the collar-bristles. All the specimens had 
sausage-like cellular masses at the tips of the branchial 
filaments. He was of opinion that the S. edificatriz, 
Claparéde, was the same species. He never encountered a 
true representative of this species, which, he says, is distin- 
guished from S, dysteri by the absence of the enlargements 
at the tips of the branchial filaments, and adds, strange to 
say, that the tubes are often intertwined with those of 
Filograna implexa. 
ee Orton’ (1914) states that the common species of 
‘““ Filograna carries ripe eggs and trochospheres at an age 
probably less than 4: months, having grown through the 
snmmer, About the same time another experiment yielded 
specimens with leit toy eggs at an age not greater 
than 10 weeks and 4 days. Later in the year full-sized 
specimens with buds had an age not greater than 4 weeks 
and 2 days. There can be little doubt, therefore, that in 
this species there is an alternation aE generations, the 
summer forms producing eggs and sperm, aud the autumn 
and winter ones producing buds.’ 
(6) Faunistic. 
In order to give a satisfactory view of the remarkable 
variations of Filograna, it is necessary in the first instanee to 
glance at the condition of the specimens from the several 
grounds, which range from Shetland to the Channel Islands 
in Britain, and elsewhere from diverse distant localities 
stretching almost from pole to pole +. 
In those from Plymouth no operculum has been seen 
up to date. In an example with a bud the bianchi had 
short pinne, but the tips had sausage-like enlargements ; 
the anterior region had seven lateral bristle-tufts besides 
the collar-tuft, two segments succeeded the anterior region 
without bristles ; thirteen bristled segments followed ; then 
the bud, the first two segments of which had no bristles, 
and twenty-three with bristles succeeded, two papille occur- 
ring posteriorly. Its branchiz were simple filaments. In 
* Jour. M. B. A. vol. x. p. 316. 
+ Those from the area of the Clyde was sent by Mr. L, Renouf of the 
Museum and Laboratory at Rothesay. 
