PHOXICHILIDIUM COCCINEUM. MW YPf 
into dishes, and by accident a hand-lens was applied to one of 
the dark-red sacs, when it was seen that the red colour depended 
principally upon a central portion, resembling in an extraordi- 
nary degree a small Pyenogon with very short legs. The sac 
was then ripped up; and the imbedded object, being extracted 
and gently freed from the investing mucus, proved to be a veri- 
table young Pycnogon. Here was a discovery—a Crustacean (?) 
within a Zoophyte! Puzzled and surprised, I endeavoured to 
ascertain more of the extraordinary partnership (the benefit all 
on one side, I am inclined to think) that appeared to exist be- 
tween the Coryne and the Pycnogon. 
The natural inference on first finding these sacs would be that 
they had been attached by the mature Pycnogon—in fact, were 
the germs cemented to the polypary, and that the difference in 
form (pear-shaped, instead of globular as when attached to the 
false feet of the female) might be the result of growth. On 
submitting, however, the sacs to microscopical examination, their 
external appearance so closely resembled the growth of Coryne, 
and, on the other hand, was so totally different from anything 
that could be imagined to be the product of a Pycnogon, that 
little doubt remained on my mind that the sacs were really the 
result of some peculiarly directed growth of this zoophyte. To 
ascertain, therefore, how far the cavity of the sac communicated 
with the central portion or ccenosare of the Coryne, a sac was 
cut transversely, near to its connexion with the supporting stem; 
and a gentle pressure being applied, the nutrient matter of the 
Coryne escaped from the wound, just as would be seen if a stem 
was so cut. Transparent specimens were next examined, and 
the result left no doubt of the sacs being part and parcel of the 
Coryne. All question upon the matter was, however, completely 
set at rest by my finding that these sacs had been already noticed 
by Prof. Allman, who, in a communication made to the British 
Association in 1859, arrived at a precisely similar conclusion 
with respect to their zoophytic origin. The abstract of his 
paper, being very short, may be here quoted entire: — ; 
“ On a remarkable form of Parasitism among the Pycnogonide.” 
By Professor Attman, M.D., F.R.S. 
‘“ The author described the occurrence, on the branches of some species 
