APPENDIX, 529 
cularis. From the position of the animals, they appear to 
have remai i hi 
emammed in One place while the sponge grew round 
them, and in some instances almost enclosed them. Mr. 
Robertson remarks, “It may be a nice point to settle whether 
the sponge serves for shelter or for food.” 
AMPHITHOR RUBRICATA. 
(Vol. I. p. 416.) 
This and all the species described in the pages from 416 to 
493 belong to the section Domicola: the left-hand heading, 
‘ Amphipoda Natatoria,” at the commencement of each genus 
and species, consequently requires correction. 
COROPHIUM LONGICORNE, 
(Vol. I, p. 494.) 
With reference to the passage quoted by us from M. Quatre- 
fages, My. Robertson writes to us: ‘In February last I had 
an opportunity of seeing C. longicorne at Dunbar, both at the 
mouth of the Clyde and in the bays, where there was no admix- 
ture of fresh water, at high water, having little doubt but that 
it is to be found on our shores all the year round. I have 
again seen it burrowing, which it does rather sluggishly. In 
this operation it brings the points. of the long antenne 
together, and pushes them into the mud; the fore-feet assist 
in widening the hole, and in turning the mud sideways; the 
hind-feet throw it backwards ; the tail is carried at an angle 
downwards, which it presses against the mud, and forces itself 
forwards. My experience leads me to think that they do not 
burrow very deeply. I find them plentifully in the soft 
surface mud, but when I remove that away to the depth of 
about three inches, I have not found them in the firmer sub- 
soil.” 
Mr. Robertson has also kept them with Annelids in the 
same vessel until they died, without perceiving them attempt- 
ing to touch the worms. 
VOL. II. M. M,. 
