REPORT ON THE ACTINIARIA. 13 



Anthozoa, the development of radial (mesenterial) folds which commences in the 

 former being' further advanced in the latter. In this case the ectodermal lona;itudinal 

 musculature of Corynactis and the Cerianthi would be, as it were, heirlooms from the 

 Scyphostomse. Both genera would thus" retain an ancestral character no longer to be 

 found elsewhere among Anthozoa, with' which would agree that both genera must on 

 other grounds be placed near to the original ancestor of the group. Of all Hexactinise, 

 the Corallimorphidse are, next to the Halcamjjw, the most primitive ; the Cerianthidae 

 again must be derived from the extremely primitive Edwardsi^. 



Family 2, Antheomoephid^, Hertwig. 



Genus Uyanthopsis, n. gen. 



Antheomorphidse with the tentacles in several rows ; body-wall smooth ; body 

 goblet-shaped, broadening upwards from the small pedal disc to the broad oral disc. 



Uyanthopsis longifiUs* n. sp. (PI. II. fig. 2). 



Tentacles very long, pointed, with an obvious terminal pore, ranged in four circlets, 

 increasing in length from the centre outwards. 



Habitat. — Eeef of the Bermudas, June 1873. One specimen. 



Dimensions. — Diameter of base, 4 cm., of oral di.sc, 7 cm. ; height, 3"5 cm. 



The single specimen, which was well preserved but strongly contracted, in its 

 shape occupies a middle position between Aiptasia and Anemonia. The base is 

 relatively small, the body not very high, but broadening out conically towards the 

 mouth. The body -wall being raised in goblet shape over the edge of the oral disc, the 

 animal possesses a " collar " in the sense of Augelo Andres, and consequently, owing 

 to the absence of cinclides and acontia, must l)e reckoned near the Ilyanthida^. From 

 these it differs in the presence of a well-developed pedal disc, by which it undoubtedly 

 attaches itself to rocks. 



The thin body-wall is smooth, except for transverse wrinkles due to the strong 

 contraction of the mesenteries. No spliincter is present. The circular muscle-lamella 

 is, in all parts of the body-wall cijually, pleated into muscular laminae, which are low, 

 and cither not at all or only sligiitly arborescent. 



The tentacles are vcr}' numerous, and are aiianged in four rows, the oi'al disc being 

 free from them in the immediate neigl)b()urhuod of the mouth. Since I counted but 

 IGO, not all the tentacles of the sixth onh r can as yet have l)eeu developed. The 

 longest of them were .some 4 cm. in Iciigtii, and 0.5 cm. bmad at the liase; the slightly 

 truncated tip possessed a small j^ore. In studying the ectodermal muscle-lamellae, 

 peculiarities presented themselves which suggested the Inngitudinal muscles on the 

 outer surface of the body-wall in Cerianthits. The muscular iilcats are generally 



