LEÜCOPSACUS SCOLIODOCUS. 49 



only in the larger specimens of the species. The larger paren- 

 chymal oxyhexactins lead over by forms of intermediate sizes to 

 the small and slender-rayed gastral oxyhexactins, which measnre 

 generally only 2()0-340 /-'- in axial length. The rays gradually 

 attenuate outwards and are usually smooth except near the finely 

 pointed ends which are more or less rough-surfaced. Only the 

 smaller oxyhexactins, notably those which I consider to be 

 gastralia, have rays rough all over on account of very minute 

 and sparsely scattered tubercles. Both the parenchymal and the 

 gastral oxyhexactins in the present species are characterized by 

 the fact that the rays are seldom straight luit for more usually 

 curved to a greater or less degree — sometimes gently and at other 

 times in an arch-like or a wavy manner — apparently in no definite 

 plane or direction. Accordingly, when they combine to form a 

 bundle, as they sometimes do, this takes an irregular sinuous 

 course ; hence the name I have given to the species. In this 

 respect the species is at once distinguishable from L. orthodocus 

 in which the parenchymal hexactins have straight rays and give 

 rise to a skeletal framework with rectangular meshes. 



The parenchymal diactins are present in such a small number 

 that in many slide-preparations of the wall they have to be 

 specially searched for. However, they are to be constantly found 

 in tolerable abundance, either isolatedly or in bundles, in the 

 basal region of the body, where they pass out from among the 

 basidictyonal mass and upwards into the body- wall. In size and 

 characters the diactins agree with those of L. orthodocus. 



The dermal skeleton again is very similar to that of the 

 species just referred to. It consists exclusively of moderately 

 large oxypentactins, amongst which none can be distinguished as 



