THE PORIFERA. 91 



L. M. B. C, No. 85. 12. Collected at Port Erin, Isle of 

 Man. L. F. M., No. 22. 4. 74. 6. Collected at Holyhead. 



FamHy. — Leucones. 



Leucandra gossei, H. 

 Leucogypsia gossei, Bk. 



This is a massive sessile species.'^ 



It is readily recognised by the large acerate spicules lying 

 longitudinally on its surface. Colour white. 



L. M. B. C, No. 85. 13. Collected at Port Erin, Isle of 

 Man. 



L. F. M., No. 22. 4. 74. 3. Collected at Holyhead. 



Leucandra nivea, H. 

 Leuconia ?iivea, Bk. 

 Orantia nivea, Fleming and Johnston. 



Coating smooth or lobular.! Colour white. 

 L. M. B. C, No. 85. 14. Collected at Port Erin, Isle of 

 Man. 



L. F. M., No. 25. 9. 73. 4. Collected at Douglas Bay. 



Leucandra johnstonii, H. 

 Leuconia Johns tonii, C. 



Mr Carter says, a good feature for recognising the species 

 is the large four-rayed surface spicule with a dark centre, 

 the dark centre being the fourth ray, or shaft, penetrating 

 the sponge substance, J Colour white. 



L. M. B. C, No. 85. 15. Collected at Port Erin, Isle of 

 Man. 



L. F. M., No. 26. 8. 82. 1. Collected at Holyhead. 



• Mon. Brit. Spong., vol. ii, p. 42 ; vol. iii. Die Kalkschwdmme, vol. ii, 

 p. 177 ; vol. iii, taf. 37. 



i Mon. Brit. Spang., vol. ii, p. 36; vol. iii, pi. v, fig. 1-8. Die 

 Kalkschwdmme, vol. ii, p. 211 ; vol. iii, taf. 39. 



\ Annals and Mag. Nat. Hist., 1871, ser. iv, vol. viii, p. 3, pi. i, figs. 

 5-12. Die Kalkschwdmme, Haeckel, vol. ii, p. 216, pi. 34. 



