30 THE VOYAGE OF H.M.S. CHALLENGER. 



respects the following family, the Antheadae. Like the latter they have long tentacles, of 

 which the muscles are hut slightly developed, and which are consequently capable of a small 

 amount of contraction, and they are also unable to draw the upper margin of the w T ah over 

 the oral disk. The most important difference between the two families is, that in the Antheo- 

 morphidae incapacity for protecting the oral disk is caused by complete want of the circular 

 muscle, whilst in the Antheadae it is owing to the muscle being only slightly developed. 



The Antheomorphidae are easily distinguished from the Corallimorphidae by the absence 

 of the intermediate secondary tentacles ; in other respects the grade of development is 

 the same in both famdies. The principal tentacles form a single corona, which exactly 

 occupies the point of junction of the oral disk and the mural membrane. The muscular 

 layers of the oral disk and of the septa are hardly pleated at all. The reproductive 

 organs are developed on all the septa. 



Besides the species described two other species should perhaps be added to this 

 family, but these were unfortunately not sufficiently well preserved to allow of detailed 

 examination. I have therefore inscribed them on the roll of doubtful forms under the 

 names of Porponia clongata and Porponia robusta. 



Antheomorphe, n. gen. 



Antheomorphidae with a corona of tentacles placed in a single row ; tentacles of 

 different sizes decreasing according to the orders ; wall smooth. 



Antheomorphe elegans, n. sp. (PI. I. fig. 8). 



Twenty-four extremely long marginal tentacles of different sizes, the six largest corre- 

 sponding to the six pairs of principal septa, the six middle to the six pairs of septa of 

 the second order, the twelve last to the interseptal spaces. 



Habitat— Station 244. June 28, 1875. Lat. 35° 22' N., long. 169° 53' E. Depth, 

 2900 fathoms. Three specimens. 



Dimensions. — Height, l"5-2 - cm.; breadth, l"5-3'0 cm. 



The three specimens upon which I founded the erection of the new genus and new 

 species were unfortunately not well preserved, so that I had almost to desist from any 

 examination of the inner parts, such as the septa with their muscular system. On the 

 other hand, the general form of the body was very well preserved. 



The animals had been dredged from the depth of 2900 fathoms, and were attached to 

 stones by their extended bases. In the largest specimen the diameter of the base 

 amounted to 3 cm., whilst the height of the cylindrical body was only 2 cm., and the 

 diameter of the oral disk again 3 cm. The lines of origin of the septa shone distinctly 

 through the wall as twenty-four streaks ; these passed on to the oral disk, which was 

 somewhat raised and thickened in the periphery of the mouth. In one specimen the 

 mouth even rose like a proboscis above the upper surface of the peristome. 



