134 Dr. S. Wright on British Protozoa and Zoophytes. 



by two septa (/). These septa were continued downwards, as 

 in the Actinias, to the lower extremity of the body, and had 

 their free edges bordered by a convoluted ciliated band, fur- 

 nished with cnidse, or thread-cells. The stomach and parietes 

 were further connected by four intersepta {g), as he should call 

 them — one between each of the lateral and anterior angles of the 

 stomach, and one between each of the lateral and posterior 

 angles; but these intersepta bore no convoluted bands. The 

 septa probably bore ovaries or spermaries, the intersepta not, in 

 which case the reproductive system of the animal now described 

 agreed in simplicity with that of the polyp of the Alcyonidse, 

 which had only eight septa, each bearing ciliated bands. The 

 upper part of each of the septa and intersepta was perforated by 

 an oval opening, so as to give an uninterrupted passage beneath 

 the tentacles to the circulation of the fluids of the body. By 

 tracing this passage in the Lucernarias, he had come to the 

 conclusion that it was the homologue of the circular canal of the 

 gymnophthalmatous Medusa. The attachments of the stomach 

 thus resembled those of the same organ in the other Helianthoid 

 and Alcyonian polyps ; but in shape it widely differed from 

 these. In Actinia and Alcyonia the stomach was a flattened 

 sac, open, and evenly truncated at its lower extremity. In the 

 animal now described the lower border of the stomach curved 

 gently downwards from the 

 superior to the lateral angles 

 (fig. 4«, 6), and from the la- 

 teral to the inferior angle it 

 bent deeply and abruptly 

 downwards (6, c), while the 

 last-named angle itself was 

 produced outwards and down- 

 wards, so as to form a beaked 

 process, as shown in the figure. 

 The thread-cells of the tenta- 

 cles are simple and unbarbed, 

 those of the septal bands fur- 

 nished with a zigzag thread. 

 When the animal was sepa- 

 rated from the peduncle of the 

 Medusa and placed in a dish 

 of sea-water, it slowly moved 

 from place to place by the aid 

 of the tenacious palpocils 

 which studded the tentacles 

 and upper part of the body, and alternately filled itself like a 

 balloon, and emptied itself by a vermicular contraction of the 



Ym. 4. 



Lateral view of stomach of H. Fultoni : 

 a, superior angle; b, lateral angle; c, in- 

 ferior angle ; dd, septa ; e e, intersepta. 



