BRITISH SPONGIADiE. 39 



2. Leuconia fistulosa, Bowerbanh. 



Grantia fistulosa, Johnston. 



Sponge. Eistular, sessile ; surface hispid, with large, stout, 

 fusiformi-acerate spicula. Cloaca single, central, 

 cylindrical, nearly as long as the sponge ; armed in- 

 ternally with spiculated equiangular triradiate spicula ; 

 spicular ray attenuated ; mouth of cloaca simple or 

 very slightly fringed with short, slender, acerate spi- 

 cula. Oscula simple, numerous, disposed irregularly 

 over the surface of cloaca. Pores inconspicuous. 

 Skeleton spicula. Large, stout, fusiformi-acerate; 

 equiangular triradiate, radii attenuated, long, and 

 slender; and slender rectangular triradiate spicula; 

 coincident radii very long, angulating ray very short. 



Colour. Pure white alive ; cream white dried. 

 Habitat. Plymouth, Mr. John Howard Stewart ; off 

 Saint's Bay, Guernsey, Rev. A. M. Norman. 

 Examined. In the dried state. 



I am indebted to my late friend Mr. John Howard Stewart 

 of the Royal College of Surgeons, for the loan of two 

 specimens of this sponge. He found them on the rocks 

 of the Eddystone Light House at low water. The largest 

 one is two inches in length, and seven lines in width, at 

 about one third its height from the base. It is somewhat 

 compressed, and is irregular in form, one side being straight, 

 while the other is sinuously curved. The other specimen 

 is one inch and a quarter long, nearly cylindrical in form, 

 but curved to about the fifth part of a circle. I have also 

 a specimen that was presented to me many years ago by 

 my late friend Professor Edward Eorbes, who could not 

 recollect the locality. It is two inches and two lines long, 

 four lines at its greatest diameter ; is nearly cylindrical 

 and is curved into a slightly sigmoid figure. 



