94 1. iJIMA. 



The shape of the hotly may host he compared to that of a 

 lamp-chiimiey, hroadest at the lower half and more or lesj narrowed 

 superiorly. The upper end is terminated hy a hemispherically arched 

 sieve-plate ; the lower end is also closed hy a thin perforated plate (lower 

 sieve-plate). Body-dimensions of a representative specimen as follows : 

 length 145 mm., greatest hreadth 59 mm., hreadth at the collor 35 mm., 

 height of the upper sieve-plate vault 18 mm. It seems the present 

 species never attains a size much exceeding the ahove dimensions. 

 In cross-section, the hody is circular. The basal tuft, whose fibres 

 emanate from the body-wall at the periphery of the lower sieve-plate, 

 forms a thick bundle as long as or longer than, the body propar. The 

 body-surface between the parietal gaps, which measure 2 mm. in dia- 

 meter, elevates into prominent knob-like or la}>pet-like protuberances or 

 into intersecting ledges which may run either somewhat after the 

 manner of E. aspergiUnni or in such a way as to form a rectan- 

 gular meshwork, each mesh being deeply depressed and with a parietal 

 gap at the bottom. Such prominences may attain a height of 11 mm. 

 and give a very corrugated appearance to the sponge. Around 

 the upper sieve-plate, there is a circular ledge, forming a cuff, whose 

 irregular edge is always directed more or less superiorl3^ 



Witli respect to spicules, the present species closely agrees 

 with E. Oiceni, in the fact that they remain luifused and in having 

 so-called compass-needles around the parietal gaj), not to menti'jn 

 other ])oints of similarity. In fact, I do not know yet of any dis- 

 tinctive character either in shape or in kind of spicules between the 

 two species. In E. MarsliaUi I find that graph iohexasters, which had 

 never yet been described from E. Otveiii, are of common occurrence ; 

 but I have reasons to believe that that form of spicules is not al- 

 together absent in the latter species. 



I have, to compare with, a few specimens of E. Oivenl, the habitat 

 of which I have ascertained to be Genkai Sea, somewhere between 

 Tsushima and Kyushyu. These, as also Marshall's original descriptions 

 (Z. f. wiss. Z. Bd. 30. Suppl.), show several important points of con- 



