REPORT ON THE ACTINIARIA. 51 



were of equal size throughout, and showed a very unusual regularity of development. 

 Directive septa are present, as I have proved from direet observation. 



The longitudinal lamella is not very strong, but pleated in a large part of the septa. 

 The parietobasilar muscle reaches half-way up the wall ; it is partly fused with the 

 septum, partly laid on it in loose folds. 



Finally, the two kinds of openings, already known in various other Actinia?, are 

 found in the perfect septa ; from their small size they might easily be overlooked, though 

 I have observed them in dissected septa, both seen from the surface and in transverse 

 section. 



Tealidium, Hertwig. 



Paractidae, having the tentacles placed in several rows and of uniform size in the 

 same row, and having the wall covered with fine papdlae. 



As I limited the genus Tealia (see p. 34) to animals with an endodermal sphincter, 

 projecting in the form of a swelling into the stomach, it became necessary to form a new 

 genus, which I have named Tealidium, for all forms which agree with the Tealidse in the 

 papillose nature of the wall, but which differ from them in the mesodermal position of the 

 sphincter. I consider it of no importance whether the papilla? are regular or irregular, 

 compacted or scattered, or whether the wall is incrusted with foreign bodies or not. On 

 the other hand, I have included the uniform character of the tentacles in the diagnosis, 

 for I regard Tealidium as a genus parallel to Paractis, which it resembles except in one 

 distinguishing point, viz., the warty nature of the body surface. 



Tealidium cingulatum, Hertwig (PI. III. fig. 3 ; PI. VI. fig. 2 ; PI. VIII. figs. 7, 8). 



Tentacles small, placed in two rows ; the mesodermal circular muscle projecting as a 

 circular swelling from the outer surface of the wall ; the wall covered with numerous lonoi- 

 tudinaJ furrows, corresponding to the origins of the septa. 



Habitat— Station 158. March 7, 1874. Lat. 50° 1' S., long. 123° 4' E. Depth, 

 1800 fathoms. One specimen. 



Colour. — (Determined from the spirit specimen) pale saffron yellow. 



Dimension*. — Diameter of the pedal disk, 1 cm.; height, a few millimetres. 



The single specimen of Tealidium cingulatum,, which was taken attached to a stone 

 from a depth of 1800 fathoms, belongs to the smallest forms among the Challenger 

 material. It is so strongly contracted that the wall closes over the entrance to the oral 

 disk till only a small opening is left. I could therefore neither determine the extent of the 

 oral disk nor the height of the body, and the only means of determining its size was the 

 diameter of the pedal disk, which amounted to about 1 cm. The colour of the body, if it 

 has not been changed by the influence of the alcohol, is a delicate saffron-yellow. 



Twenty-seven sharply-defined longitudinal furrows can be counted on the wall; they 



