APPENDIX. 529 



cularis. From the position of the animals, they appear to 

 have remained in one place while the sponge grew round 

 them, and in some instances almost enclosed them. Mr. 

 Eobertson remarks, " It may be a nice point to settle whether 

 the sponge serves for shelter or for food." 



AMPHITHOE 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, Mr. 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 antennae 

 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. 



