PLATE III. 



LEUCOSOLENIA BOTRYOIDES, Bowerbank. 



Vol. ii, p. 28, ' Mon. Brit. Spongiadse,' and vol. i, pi. xxvi, figs. 347-348. 



Fig. 1. A specimen of L. botryoides from Shetland, 

 in which the fistulas are much more developed than is 

 usual with the species. Natural size. 



Fig. 2. A specimen of L. botryoides parasitic on a 

 slender fucus, in which the fistulas are small and 

 scattered along the stem. This form is the usual one 

 under such circumstances. Natural size. 



Fig. 3. One of the equiangular triradiate spicula of 

 the skeleton of L. botryoides. X150 linear. 



Fig. 4. One of the spiculated, equiangular, tri- 

 radiate, internal, defensive, spicula of L. botryoides. 

 X 150 linear. 



Vol. i, Plate XXVI, fig. 348, represents the fistulas 

 clustered in a group, as they are frequently found in 

 Weymouth Bay and at Tenby. Natural size. Fig. 

 347 in the same plate represents two of the fistulas. 

 X 50 linear. 



LEUCOSOLENIA CONTOETA, Bowerbank. 



Vol. ii, p. 29, ' Mon. Brit. Spongiadse.' 



Fig. 5. A small specimen of L. contort a from 

 Guernsey, magnified to illustrate the contort arrange- 

 ment of the fistulas. X 150 linear. 



Fig. 6. The specimen represented by fig. 5. 

 Natural size. 



Fig. 7 represents one of the largest specimens of L. 

 contorta that I have yet seen. Natural size. 



Fig. 8. One of the slender, equiangular, triradiate, 

 internal, defensive spicula of the skeleton of L. contort . 

 X 150 linear. 



