32 A MONOGRAPH OF THE 



In the dried condition L. contorta and coriacea are more 

 liable to be mistaken for each other than the former and 

 L. hotryoides, but the total absence of defensive spicula on 

 the cloacal cavity of L. coriacea readily distinguishes it 

 from either of the other two species. 



3. Leucosolenia lacunosa, Bowerbank. ' 



Grabtia lacunosa, Johnston. 



Sponge. Massive, more or less eUiptical, pedicelled; 

 surface smooth ; fistulse tortuous. Cloaca unarmed 

 internally; mouth simple, single, and unarmed. 

 Pores inconspicuous. Skeleton : spicula equiangular 

 triradiate; radii very slightly attenuated until near 

 the apices, termination rather obtuse, and a few long 

 acerate spicula near the base of the sponge. 



Colour. — Light gray or white. 



Habitat. — On rocks at low water near Scarborough, 

 very rare, Mr. Bean ; in deep water, coast of Ireland, Mr. 

 Hyndman ; Shetland, Mr. C. W. Peach. 



Examined. — In both the fresh and the dried state. 



The specimen of this sponge figured and described by 

 Dr. Johnston in his 'History of British Sponges,' p. 176, 

 has the body of the sponge five lines in height and two in 

 breadth, while a dried specimen in my possession, for which 

 I am indebted to my friend Mr. Bean, has the same part 

 two and a half lines in height and four in breadth, the 

 proportions in this case being nearly reversed ; the pedicel 

 in both is nearly of the same height. Dr. Johnston 

 describes the species as "flabellate, entire or undivided, white, 

 greatly compressed, the sides perforated with numerous 

 irregularly elliptical holes or vents, so as to give a lacunose 

 appearance to the dried specimen ; structure compact, 

 friable when dry ; spicula all triradiate. The remarkable 

 character afforded by the numerous large holes in the sides, 



