REPORT ON THE ANTIPATHARIA. 



43 



portion of the section passes below the depression in the peristome, the upper portion 

 passing through it. The transverse mesenteries are now seen to be enormously elongated, 

 and to extend the whole length from the stomodreum to the extremity of the zooid. 

 Fig. 10 represents a section at a little lower level, where the secondary mesenteries have 

 become entirely lost. The elongate transverse mesenteries bear the reproductive organs, 



Fig. 8. Fig. 9. Fig. 10. 



Figs. 8, 9, and 10. — Horizontal sections of Parantipathes larix. The tentacles are not represented. 



Fig. 8. — Section through the upper portion of the oral cone. 



Fig. 9. — Subhorizontal section passing through the extreme depression of the peristome in the upper part of the figure, and beneath 



it in the lower portion. 

 Fig. 10. — Section m a plane between the insertion of the lateral and of the sagittal tentacles. 



chiefly near their distal extremities. For the sake of clearness the tentacles have been 

 omitted in the figures. Those in the sagittal axis open into the central portion of the 

 ccelenteron at a lower level than the section shown in fig. 10. The tentacles in this 

 genus are long and slender, differing considerably from those of Antipathella. Lacaze 

 Duthiers and v. Koch have studied the structure of this species ; the former made 

 drawings from living specimens. 



Aphanipathes. 



The zooids in this genus are small, and in many forms are much obscured by the 

 long spines of the axis, which project beyond the surface of the zooid. In all the species 

 examined the zooid is more or less oval in shape, the greater diameter corresponding with 

 the axis of the sclerenchyma. They are somewhat irregularly distributed, not always in 

 a single row, and there is usually a marked interval between the zooids. The tentacles 



