1 £ Art. 1.— N. Annandale and T. Kawaniura : 



Yanaidza, Province of Rikuzen. 



Lake Nakatsuna, L. Kizaki and L. Suwa, Province of Shinano. 

 A small pond at Yodo, and Osawa Pond near Kyoto. 

 At Okayama (Province of Bizen) and Hiroshima (Province of 

 Aki) it has been found in the leading pipe of the city water- works. 13 



Genu s Heleromeyenia, Potts. 



Heteroineyenia kawamurae Annandale, sp. nov. 



PL II, figs. 3. 



This sponge is known to me only from two somewhat degene- 

 rate specimens taken on a single occasion. It is impossible, there- 

 fore, to give a detailed description of its external form that would 

 likely be of permanent value. All that can be said is that 

 the type-specimen appears to have consisted of a thin film giving 

 rise to short anastomosing branches and that the colour in life was 

 bright green. 



The skeleton is very fragile. Its fibres are well-defined but 

 slender and lacking in horny matter. They form a loose, irregular 

 network. 



The skeleton-spicules are small, relatively slender, sharply 

 and gradually pointed, smooth or with a few minute scattered 

 spines. 



The free microscleres are minute, relatively very slender, 

 irregularly spined and often bearing a few relatively long spines 

 near the middle. These spicules are very scanty. The gemmule- 

 spicules are not so strongly differentiated into two types as in some 

 species of the genus. Indeed, there is little difference except in 

 point of actual length. The shafts of the shorter spicules are, 

 however, as a rule slightly stouter relatively than those of the 

 larger ones. In both cases the shafts are straight, rather slender 

 and either smooth or armed with but a few scattered spines of 

 relatively large size. In the shorter spicules the shaft is about 

 3 to 5 times as long as the diameter of one rotule, while in the 

 longer ones it may be as much as 10 times, though sometimes not 



1) cf. Parker : Proc. Zool. Soc. London, 1913, Part IV, p. 973-976. 



