Dr. J. V. Barboza du Bocage on Hyalonema boreale. 37 
curious example of Hyalonema lusitanicum, in which there are 
two bundles of filaments to a single sponge, nearly as in the 
annexed drawing (p. 36). Now I can perfectly conceive that the 
two bases, originally distinct, have become confounded together 
with increasing age; but I cannot understand this confusion 
if we are to assume that the natural position of Hyalonema 
is the reverse of that indicated in my sketch. 
I am now convinced that Hyalonema is a sponge. As to 
the polypes (Palythoa fatwa, Schultze), I regard them as para- 
sites. Ihave several specimens of Hyalonema with other para- 
sites: two are covered with an Antipatharian, three abso- 
lutely destitute of polypes and sponges, one embraced by the 
foot of an Actinia of what seems to me a new species. It is a 
flesh-coloured Actinia of enormous size. 
I am still sufferig from my recent illness. As soon as I 
am a little recovered, I shall endeavour to publish some sup- 
plementary notes upon the discovery of our learned friend 
Lovén. 
Believe me, always your devoted friend, 
J. V. Barsoza Du Bocace. 
My DEAR FRIEND : Lisbon, May 10, 1868. 
After a more careful examination of our two little sponges, 
I have arrived at somewhat different results, which I hasten to 
Fig. 1. a, head; }, stem; ¢, base. Fig. 2. Aggregation of linear spi- 
cules forming the stem. Fig. 8. Interior of the head to show the radiating 
bundles. Fig. 4. Spicules implanted perpendicularly upon the head and 
base. Fig. 5. Spicules of the radiating bundles. Fig. 6, Spinous spicules 
of the sarcode of the stem. Fig. 7, Spicules of the stem or axis. 
