37 
plenty of pores are to be seen On the stem on the contrary the 
pores are very few in number, they are totally absent even along 
a considerable tract. The colour of this pedicel is more browny, 
that of the body gray-yellowish. The inner surface of the body, 
i. e. the entrance of the funnel, shows a few oscula. These oscula 
are in the centrum; at the periphery there are many smaller ope- 
nings. Perhaps these are oscula too, but it seems to me more 
probable that they are pores. I must however add that I cannot 
prove that the large ones are osceula. But this will never be pos- 
sible when the Sponge is dead; we simply call the openings „os- 
cula”’ when they are large and pores when they are small. There 
are indeed many analogious cases with other Sponges! — Fig. 145 
on Plate IV shows that these oscula are the openings of a few 
wide canals, one of which even continues itself in the stem. The 
walls on the upper part of the sponge-body are very thick in this 
variety. For that reason I have named it crassa. 
The skeleton of the stem consists of rather strong so called kera- 
tode-fibre, containing the acuate spieules. The fibre in the body is 
a much softer, and even not always present. The spicules are acuate , 
often a little constrieted at the top; these are swbspinulate. It is 
remarkable that they vary much in length, but not in diameter, 
as the figg. 68a—h, on Plate III show. 
16c. Cribrochalina variabilis var. salpingoides”*) [Pl. I, fig. 17; 
pl. IV, figg. 146 and 147]. 
In this variety there is again a rather long pedicel, but here no 
difference in colour is to be seen between the pedicel and the body. 
The margin is bent outwards; hence the trumpet-like shape of the 
Sponge. The surfaces (external and internal) are much more smooth. 
Only one osculum is to be seen, and accordingly only one large 
canal, with which the smaller ones communicate. (Pl. IV, Fig. 
*) adırıys = a trumpet. 
