British Protozoa and Zoophytes. 



133 



there denominated ' Peachia Fultoni,' but it evidently belongs to 

 the genus Halcampa (Gosse). 



"The author stated that, in the summer of 1858, he took, by 

 dipping, a great number of Medusas of the genus Thaumantias, 

 off Granton Pier. To the peduncle of one of these was attached 

 a small Actinia, about half an inch in length and one-eighth of 

 an inch in diameter. From its general appearance he considered 

 it to be a young specimen of Actinia troglodytes, which had been 

 seized by the Medusa, dragged from its native mud, and brought 

 captive to the surface of the water; but it was unfortunately 

 lost before he could examine it carefully. In June, his friend 

 Mr. Fulton, of Granton Pier, brought him some specimens of 

 Thaumantias, to one of which another Actinia, of the same spe- 

 cies as the one he had before observed, had attached itself by 

 swallowing the peduncle of the Medusa. The body of this Ac- 

 tinia was of a transparent yellowish-white colour, and marked 

 by twelve paler lines, indicating the situation of the longitudinal 

 septa within. The oral disk was oval, and formed by the basis 

 of the tentacles and the mouth. The tentacles were twelve in 

 number, of a rich umber-brown colour. About one-half of each 

 from the base was marked with five opake pale-yellow lozenges, 

 and from thence to the top by four bands of the same pale- 

 yellow colour. The brown matter consisted of amorphous 

 pigment-granules, the yellow matter of highly refractive and 

 exceedingly minute molecules, ap- 

 parently calcareous. Each tentacle 

 was curved backwards, and resem- 

 bled the abdomen of a wasp. The 

 pigment could be forced through 

 the top of the tentacle by pressure, 

 indicating an opening at that part. 

 The mouth, instead of being linear, 

 as in the Actinias, tended to assume 

 a quadrangular or crucial form, 

 though the constantly varying shape 

 of the disk rendered a description of 

 it difficult. The stomach was very 

 peculiar, and differed from that of 

 the Actinias. It was a flat and ob- 

 scurely quadrangular sac in trans- 

 verse section (fig. 3). Its angles he 

 should describe as superior (a), la- 

 teral (6), and inferior (c). The su- 

 perior angle was connected to the 

 parietes of the body by four septa (d), 

 the lateral angles each by one septum (e), and the inferior angle 



Fiff. 



Transverse section of H. Ful- 

 toni : a, superior angle of sto • 

 mach ; b b, lateral angles of 

 ditto ; c, posterior angle of 

 ditto ; dddd, ee, ff, septa, 

 g g g g, intersepta, uniting sto- 

 mach with parietes. 



