Dr. W. C. M'lntosh on the Zoophytes of St. Andrews. 219 



cimens occasionallj appear ou stones at extreme low water, 

 and when veiy hungry greedily swallow green seaweeds. 

 Some expand the disk like a Don's or Larnellaria^ and float 

 on the surface of the water. 



Genus 2. Sagartia. 



Sagartia troglodytes^ Johnston ; Gosse, Brit. Anem. p. 88, 

 pi. 1. fig. 3, pi. 2. fig. 5, &c. 



Ever^^iere abundant under stones, and attached to rocks 

 near low- water mark. In regard to the physiology of the 

 digestive sac, ]\Xr. Gosse * states that the walls of this chamber 

 are only separated for the reception of food ; but in this species 

 the mouth often expands, and the digestive cavity dilates, so 

 as to be readily viewed as an open and empty sac. The 

 ciliary currents course over the lip and into the stomach ; so 

 that minute particles of nutriment might be available, though 

 by no means necessary. 



Fam. 4. Actiniadse. 



Genus 1. Actinia, L. 



Actinia mesertibryanthemum, Ellis & Sol. ; Gosse, Brit. Anem. 

 p. 175, pi. 6. figs. 1-7. 



Very common on stones and rocky ledges between tide- 

 marks. 



Fam. 9. Bunodida. 



Genus 3. Tealia, Gosse. 



Tealia crassicornisj O. F. Miiller ; Gosse, Brit. Anem. 

 p. 209, pi. 4. fig. 1, 



The variety coriacea {Actinia coriacea^ Cuvier) is extremely 

 abundant along the West Rocks at low water, while the other 

 comes in great profusion and of large size from the deep water 

 of the bay. A bifid specimen occurred at the Castle rocks. 

 This species is also found in the stomach of the cod. 



Genus 5. Stomphia, Gosse. 

 Stomphia Chirchice, Gosse, Brit. Anem. p. 222, pi. 8. fig. 5. 

 Occasionally from deep water. 



• Brit. Anem., Introd. p. xvi. 



