EEPORT ON THE ACTIISTIARIA. • 37 



pairs of directive septa, the faces provided with longitudinal muscles are turned to one 

 another. The directive septa on both sides (fig. 5, rh) are formed very irregularly ; in 

 each pair one septum is very strong, whilst the other is rudimentary ; the latter never 

 reaches as far as the CBSophagus, and was so small in one case that it was not possible to 

 perceive the manner in which the muscles were arranged. 



The other pairs of septa vary in size, though they could not be divided into different 

 orders, as a series of strong, large septa, which have almost all attained to an equal degree 

 of development, is followed by a number of smaller septa ; the former reach to the 

 oesophagus, whilst the latter are imperfect. There were, on the whole, probably from 

 thirty to forty pairs of septa. This difference of size in the septa, and especially the 

 disproportion between the directive septa, is so unusual that it comes to be a question 

 whether the specimen examined was normally developed. 



Tealia hunodiformis belongs to those species in which I have observed that two 

 adjacent septa may be connected by their free margins. In such cases it is two septa of 

 diflferent adjacent pairs which pass continuously into one another inside the strong 

 longitudinal swellings. 



The reproductive organs of the animal examined were ovaries, and were found on all 

 the septa, except on those which were behindhand in their development. Two of the 

 directive septa were consequently sterile, whilst the other two were furnished with 

 reproductive organs. 



Tealia hunodiformis differs very markedly from Tealia crassicornis. In Tealia 

 bunodiformis the muscular fibres of the tentacles and oral disk are ectodermal, whilst in 

 Tealia crassicornis they have passed into the mesodei-m ; in the former, reproductive 

 organs are present on the septa of the first and second order, whilst in the latter they 

 are absent. It may, therefore, perhaps be well at some future time to make Tealia 

 bunodiformis represent a new genus distinct from Tealia crassicornis. I have chosen 

 the name " bunodiformis," because in some parts the warts are grouped in longitudinal 

 rows, and therefore have the same arrangement which characterises the genus Bunodes. 



Leiotealia, Hertwig. 



Tealidse with smooth body surface, without warts, and without spherules, but with 

 longitudinal furrows corresponding to the insertions of the septa ; tentacles of equal 

 size, arranged in several rows. 



Leiotealia, as the name shows, is a Tealia with smootli body surface, and therefore 

 bears the same relation to the true Tealia as Paractis does to Tealidium. According 

 to Milne-Edwards they belong to the genus Paractis, from which I have separated 

 them on account of the eudodermal position of the circular muscle. 



