E. OWENI. — MISCELLANEOUS NOTES. 215 



malia. For the rest, the spiculation of the phxte is essentially 

 the same as in other species. 



Miscellaneous Notes. 



In PI. VI, fig. 2, I call attention to the presence of a 

 small, accessory sieve-plate on the side of the sponge, at some 

 distance from the normal, terminal sieve-plate. A similar case 

 of abnormality has also been noticed under E. inarsJialU. 



Another observation, which I should mention in this con- 

 nection, is that once in a specimen {L) of E. oiceni the sieve- 

 plate was found to have an unusually irregular outline, and 

 seemed in certain places to have appropriated the adjoining parts 

 of the lateral parietes by converting the skeletal lieams, as these 

 are usually arranged, into sieve-plate beams. 



The above cases of abnormal development are, I think, of 

 interest, as demonstrating the fundamental unity of the sieve- 

 plate with its angular meshes and the lateral wall with its 

 round, parietal oscula. 



The Crustacean inmate of E. oiveni is Spongicola renuxta 

 DeHaan, the same as in E. iimrshalU (see p. 201). The type 

 of that Crustacea, described by DeHaan in the Fauna .laponica, 

 was probably taken from the specimens of E. owcni, which were 

 taken to Europe by Major v. Siebold. Of all the specimens of 

 E. oweni I have examined, seven possessed each a pair — invari- 

 ably a male and a female— of the Crustacea. The others con- 

 tained some one, some none at all ; but since the sponge-wall 

 was more or less damaged in all of these cases, loss of the in- 

 mate may possibly have taken place in certain instances. 



