36 MARINE FAUNA OF ST. ANDREWS. 



Order I. Zoantharia. 



Suborder ACTINARIA. 



Fam. 2. Sagartiadae^ Gosse. 



Genus 1. Actinoloba, Blainville. 



Actinoldba dianthus, Ellis; Gosse, Brit. Anem. p. 12, 

 pi. 1. fig. 1. 



[Plate I.] 

 Common in the d^ris of the fishing-boats, and thrown 

 ashore after storms attached to sticks and shells. Young spe- 

 cimens (Plate II. fig. 8, and woodcut, p. 39) occasionally 

 appear on stones at exti-eme low water, and when ver)- 

 hungry greedily swallow green seaweeds. Some expand 

 the disk like a Doris or Lamellaria, 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. 



Everywhere abundant under stones, and attached to rocks 

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

 digestive sac, Mr. 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 com'Se over the lip and into the stomach ; so 

 that minute particles of nutriment might be available, though 

 by no means necessary. 



Fam. 4. Actiniadae. 



Genus 1. Actinia, L. 



Actinia mesemirt/anthemum, Ellis & Sol. ; Gosse, Brit. Anem. 

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



Very common on stones and rocky ledges between tide- 

 marks. 



• Brit. Anem., Introd. p. xri. 



