3i 



The opening may be narrowed or quite shut by contraction. Parallel to the central 

 canal are secondary ones, resembling the state of things in trop. vagabunda. Texture 

 comparatively compact. Surface not shining, but, by the presence of projecting tylostyles, 

 velvet-like or hispid. Color generally yellowish. No robust spinispirae; small spinispirae 

 not forming a dermal crust, often scarce or absent. Tylostyli rather stout. Typical 

 representatives are: Suberites inconstans var. digitata (B.M. 23), 1365, 1971, 1975, 2049- 

 In the other specimens we see low processes (B. M. 11), still lower and undistinct in 1947, 

 which is, however, undoubtedly identical with it. Probably are 638,1211,1260, M. M. 61, 

 M. M. 62, M. M. 63 to be included here. By 1947 and B. M. 11 trop. digitata is allied to 

 trop. pyramidalis (1949). 



Trop. concrescens. The most characteristic feature of trop. concrescens is the marked tendency 

 ot the processes to fuse together. We find this tendency likewise in trop. tubilifera but 

 here it is less conspicuous. Whereas the central canals in typical tubulifera-spedmens 

 is very wicle and the process more or less cylindrical, we observe in trop. congrescens 

 central canals which are of an intermediate size between those of trop. tuberosa and 

 those of trop. tubulifera; the ratio between the diameter of the central canal and the 

 process is about as it is in many specimens of trop. digitata. Another characteristic 

 feature seems to be the tendency the processes show to become club shaped (PI. I, fig. 3). 

 In 1341a we have an interesting specimen, showing processes of very different shape: 

 one is digitate like often in trop. tubulifera and in trop. digitata ; another is more or 

 less club shaped (PI. II, fig. 3). In 6i2d it is seen how neighbouring clubs fuse together 

 (PI. I, fig. 3), whilst a part of their sterns remain separate. In 1047 the processes are 

 almost entirely fused ; this specimen agrees with Lendenfeld's figure of " Vioa florida" '. 

 For the rest concrescens and tubulifera have the same characters: yellowish color, often 

 stout tylostyli and not abundantly furnished with spinispirae. It is worth while to draw 

 attention to the fact that in 1047 there is a distinct dermal crust of spinispirae, like we 

 find in trop. digitata a. o. Typical representatives are: 305 a-d, 612 b-d, 1341 a-d, 1047, 

 Vioa Jïorida Ldfd. Perhaps may be included: i^g, 210, 1141. 



Trop. glaebosa l ). Irregularly spherical or cakedike masses, without digitate processes. Surface 

 uneven, minutely hispid, showing numerous comparatively large openings or pits with 

 irregular outline, not unfrequently slitdike, meandering. Color generally yellowish. Tylostyli 

 often rather stout; spinispirae small sized, often very scarce or absent. Typical examples 

 are: Suberites inconstans var. globosa and var. maeandrina (B.M. 9, B M. 25 ), 98, 612 a, 

 93la-b, g64a-b, g66a-c, Hymeniacidon angulata Bwk. (B.M. 8, B.M. 21, B. M. 29)- 

 Included in this tropus can be : 245, 764, 1418, 1447, 2030, 2031, 2032, M. L. B. 135, 

 M. L. B. 136- V\ e will see hereafter that trop. concrescens almost imperceptibly passes into 

 trop. glaebosa ; and as the former is likewise in many ways related to trop. tubulifera 

 and trop. digitata, we find all our six tropi, in spite of enormous differences, representing 

 but one species. 



i) glaeba, lump. 



