474 REVISION OF THfE AXINELLID^, i., 



are nearly always sharply and regularly pointed. Styli are of 

 rather frequent occurrence, their proportionate number being 

 approximately one in ten; anisoxea are met with in the stalk 

 and very rarely also in the branches. They range in length from 

 about 280 to 420 or 430//. (with a maximum stoutness of 14 or 

 15/x) in the branches, and up to 5.30//- in length by 23/x in stout- 

 ness in the stalk. 



The spirulie and their derivatives are without distinctive 

 features, either as regards size or relative lunnbers. 



The microstrongyla appear to be exclusively of the stouter 

 kind occurring in the typical variety, and never centrotylote; 

 they are moderately scarce, and attain a size of 20 by 5/i.. • 



Trachycladus digitatus var. clavatus, var.nov. 



(PL xxii., fig.-l: Pl.xxiii., fig.3: PI. xxv., fig.2: PI. xxvii. fig.3: 



PL xxviii., fig. 5; PL xxix., lig.l.) 



Diatjiiosis. — Branches gradually increasing in diameter distally, 

 thus becoming elongately club-shaped and attaining to fair stout- 

 ness. Oscula in part scattered irregularly, and in part (or some- 

 times almost without exception) arranged more or less distinctly 

 in two longitiKlinal series on opposite sides of the branches. 

 Radial fibres generally nearly twice the diameter of the axial 

 fune. Megascleres chiefly sharp-pointed oxea, but intermediate 

 forms between these and strongyla are more or less frequent; 

 stylote modifications comparatively rare; maximum size varying 

 (in different specimens) from 400 x 14 /a to 480 x 17/x in the stalk, 

 rarely exceeding 300 x 9 /a in the branches. 



Luc.—Vovt Phillip. 



This variety is based upon three specimens markedly distin- 

 guished from all the remaining available examples of the species 

 by the shape of the branches, which gradually increase in diam- 

 eter upwards from their base, attaining their maximal stoutness 

 at no great distance from their extremities. Two of the speci- 

 mens are comprised amongst those recorded by Dendy(7) as ex- 

 amples of Trachycladus Irevisphndifrr Carter, — being, namely, 

 the two (with the reg. nos. 415 and 1046) referred to by him as 

 distinguished from the others by their more robust and stouter 



