NOTES AND QUERIES. 39 



I much regret the unfortunate omission of these records from 

 the catalogue. — E. W. Swanton (Educational Museum, Haslemere). 



Slipper-Limpet in Essex. — Mr. G. 0. Eobson (" On the Extension 

 of the Range of the American Slipper-Limpet on the East Coast of 

 England," ' Ann. and Mag. Nat. Hist.,' pp. 496-499, 8th Ser., vol. xvi, 

 December, 1915) has recently drawn attention to the spreading 

 of the Slipper- Limpet (Grepidula fornicata) on certain portions of 

 the coast. It will therefore be of interest to point out that whilst 

 on a dredging expedition at Walton-on-the-Naze, Essex, on October 

 27th, 1915, I obtained four living examples of this mollusc, two of 

 which, attached to an empty shell of a Whelk, are at present 

 (January 12th) to be seen in one of the public aquaria of the Horni- 

 man Museum at Forest Hill. The Slipper-Limpets were all 

 obtained at one place, about a mile and a half down the irregular 

 arm of the sea which extends from the old mill at Walton towards 

 the open water. I have spent several days at different times of the 

 year in dredging at Walton, but had never before obtained the 

 Slipper-Limpet. The boatman informed me, when I drew his atten- 

 tion to the molluscs, that he was already aware that Slipper- Limpets 

 were to be found in the neighbourhood. — H. N. Milligan. 



ANTHOZOA. 



Sagartia parasitica Mounting on Shells. — On the afternoon of 

 October 22nd, a small so-called Parasitic Sea-Anemone (Sagartia 

 parasitica), of about half an inch in length, was dropped into an 

 aquarium. It fell close to a small Hermit-Crab (Eupagurus bern- 

 hardus) enclosed in a Nassa shell. A few seconds later it so 

 happened that the Hermit- Crab dragged its shell past the Sea- 

 Anemone, and the latter adhered to the pointed end of the Nassa 

 shell by means of its disc and tentacles, and it was dragged behind 

 the crustacean. The Sea-Anemone quickly bent its column, in a 

 way which was suggestive of the action of a looping caterpillar, so 

 that it was able to press a portion of its base on the shell, and by 

 this part of its base it adhered. The disc now released its hold of 

 the shell ; the remainder of the base was pressed on the shell ; and 

 then the column of the Sea-Anemone was raised so that it stood 

 obliquely out from the shell in the characteristic manner of this 

 ccelenterate. This process occupied not more than five minutes, 

 though I neglected to note the exact time taken. In order to 

 observe whether the Sea-Anemone would repeat the action, I 



