GRANTIA. 181 



is Montagu's description of the Sp. ananas : " This elegant 

 minute sponge is nearly allied to coronata, but is very different 

 in shape and texture ; the surface is not covered with spicules 

 as in that species, but is apparently vesicular or scaly, and when 

 magnified, somewhat resembles an extremely fine Millepora, 

 except that no openings or pores are visible, nor is it of the 

 same consistence." 



6. G. FiSTULosA, simple and compressed, the surface 



villose, the vent terminal and naked ; spicula triradiate, very 



unequal. 



Plate XX. Fig. 7. 



Hah. Coast of Ireland. Portaferry, Wm. Tliompson. 

 Sponge forming a long simple tube, perhaps subcylindrical 

 when recent, three or four inches in height, and about half an inch 

 in diameter, attenuated at the base, with a wide even vent at the 

 opposite truncate extremity ; the surface not porous nor muricat- 

 ed but shortly villose ; the walls imperfectly cellular : spicula tri- 

 radiate, very unequal in size, the rays diverging also at various 

 angles, often very long and evenflexuous. Some of the spicula are 

 remarkable for their great size ; and there appears to be inter- 

 mixed with these compound sort a simple one shaped like a 

 needle, but these may be merely rays of the other broken away 

 near the base. 



The specimens I have seen have attached to their base the 

 stalk of some slender fucus which grows usually near low-water 

 mark. In a dried state the sponge is of a whitish colour and 

 friable. 



** Crustaceous. 



6. G. NiVEA, of a close texture, pure white, the fecal 

 orifices small and level ivith the surface ; spicula triradiate 

 and quadriradiate. 



