40 
Mr. W. Sells on the Silk-Worm. 
knowing it was previously known.* The Crustacea were almost 
as visible in the transparent body of the Beroe as they had previ- 
ously been, and very conspicuous by the bright green of their 
colouring. From the 3d of May I was almost daily using my 
towing net, yet did not take another specimen of this animal until 
the 16 th of the same month; on that day I took sixteen of them, 
but was at the time on the point of starting for Belfast, and had 
only leisure to make the rude drawing I have given, and attach 
the specimens hastily to cards. 
“ They swim with a lively and constant motion, and jerk them- 
selves out of the way when pursued. I am anxious to know what 
they are, as they form a portion of the food of a tentaculated Beroe, 
which differs in many respects from the description and drawing of 
the Beroe Pileus given by Dr. Grant, and which I am at present 
inclined to regard as a distinct species.” 
(The descriptions of the other Species alluded to in the intro- 
ductory remarks will appear in the next Number.) 
VII. Notes respecting the Variety of the Silk-Worm which 
spins white Silk. By W. Sells, Esq., M. E. S. 
[Read November 7, 1836.] 
As I was desirous of giving some attention to the history and eco- 
nomy of the new variety of silk-worm, the eggs of which were 
stated to have been imported from China, and were distributed 
among some members of the Society at their June meeting, I made 
some notes from day to day, a copy of which is now submitted to 
the notice of the Society. 
June 7. — The eggs began to hatch on the evening of their dis- 
tribution, and the young worms were all out in the course 
of eight or nine days ; as mulberry-leaves were easily pro- 
cured in abundance, and they were regularly fed, they 
throve remarkably well, and arrived at maturity by the last 
week of July. 
August 4. — The worms have been spinning their cocoons of 
perfectly white silk during the last week ; they are decidedly 
larger than those of the common sort, and vary much in 
figure, several being nearly spherical, others cylindrical, 
* M, Risso mentions liis finding rhronima sedentaria in the interior of a Beroe. 
