PLATE IV. 



LEUCOSOLENIA LACUNOSA, Bowerbarik. 



Vol. ii, p. 32, ' Mon. Brit. Spongiadse.' 



Fig. 1 . A magnified view of a fine specimen of 

 L. lacunosa from deep water at the Turbot Bank, 

 Belfast, preserved in spirit in the condition in which 

 it came from the sea by Mr. George Hyndman, of 

 Belfast, exhibiting the rotund form of the sponge, 

 and the tortuous mode of disposition of the fistulas. 

 X 12 linear. 



Fig. 2. -The same sponge. Natural size. 



Fig. 8. A small specimen of the same species, and 

 of the same form, as that represented by figs. 1, 2 

 from deep water off Larne, near Belfast, dredged by 

 Mr. Gr. Hyndman, and preserved in spirit in the state 

 in which it came from the sea. Natural size. 



Fig. 4. A compressed specimen of L. lacunosa 

 from Scarborough, by Mr. Bean. It is remarkable 

 from the breadth of its body being much greater than 

 its height. Natural size. 



Fig. 5 represents a portion of one of the fistulas of 

 a specimen mounted in Canada balsam, exhibiting the 

 mode of the disposition of the equiangular, triradiate, 

 skeleton spicula, the more or less elongation of the 

 ray of the spiculum parallel to the long axis of the 

 fistula. X 123 linear. 



Figs. 6, 7. -Two of the skeleton spicula from the 

 surface of the portion of the specimen represented by 

 fig. 5. X 123 linear. 



Fig. 8. One of the acerate spicula from near the 

 base of the body of the sponge. X 123 linear. 



This species is figured by Dr. Johnston in his 

 ' History of British Sponges,' plate xx, figs. 2, 3. 



