474 ME, W. H. POLLOCK ON THE 



depended upon as specific characters. I have named T. ennius 

 by comparison with specimens separated in our collection by the 

 author of the species when last in England. 



73. Thanaos teistis, Boisduval, Ann. Soc. Ent. France, 1852 

 p. 311. Mendocino County. 



Mr. Grodman adds the following species : — 



74. Caeteeocephalus omaha. — Hesperia omaba, Edwards, 

 Proc. Ent. Soc. Phil. ii. p. 21 (1863). Siskiyou County. 



" Very like our English species." 



On Indications of the Sense of Smell in Actinice. By Waltee 

 Heeies Pollock; with an Addendum by Gteoege J. 

 EoMANEs, LL.D., E.R.S., Sec. Linn. Soc. 



[Eead June 15, 1882.] 



About two years ago, when I was staying on the west coast of 

 Scotland, I spent a morning among the rock-pools left by a 

 receding tide. Many of these pools were occupied by specimens 

 of the common Sea-anemone lying in circles; and presently 

 something in the behaviour of these creatures attracted my 

 notice. This was that they appeared to become conscious of the 

 presence of any kind of food (pieces of Mussel, Limpet, &c.) which 

 I placed near them. If this was held near an individual Anemone 

 the creature opened ; if it was held in the centre of one of the circles 

 the Anemones gradually opened in succession. Thinking that a 

 burst of sunlight, coinciding with the ofier of the bait, might 

 have something to do with this, I repeated the process in pools 

 shaded from the sun, with the same result. Pieces of stick or 

 stone placed in the water (if placed, that is, so as to make a con- 

 siderable disturbance) seemed to make some slight agitation, 

 which, however, soon subsided ; if placed so as to avoid any dis- 

 turbance they had no visible efi'ect. 



I told my friend Mr. Eomanes some time afterwards what I 

 had observed. He, I believe, first verified my observations for 

 himself, and then proposed that we should repeat the experiment 

 together. This we did at the Aquarium of the London Zoological 

 Gardens, and afterwards at the Crystal-Palace Aquarium. Mr. 

 Eiomanes provided for the experiment some morsels of Cockle, 

 which we attached to threads. Some of these morsels we sus- 



