PLATE XXll. 



Phakellia VENTiLABEUM, Bo'werhank. 



Vol. ii, p. 12-2, • Mon. Brit. Spongiada=^.' 



Fig. 1. — Represents an expanded cup-shaped speci- 

 men of the species of the natural size from the Haaf 

 Banks, Shetland, in the Avet condition as it came from 

 the sea. 



Fig. 2. — A smaller sized cup -shaped specimen, the 

 cup being naturally cleft to the base of the sponge, 

 natural size ; in the wet condition. From the Haaf 

 Banks. 



Fig. 3. — An irregularly fan -shaped specimen, natu- 

 ral size, and in the wet condition. From the Haaf 

 Banks. 



Fig. 4. — -A small, cup-shaped specimen of the 

 natural size, from a dried specimen. From the 

 Hebrides. I have received numerous specimens from 

 that locality, the greater portion being cup-shaped, and 

 some of them not exceeding half an inch in height. 



Fig. 5. — A skeleton spiculum from one of the axes 

 of the sponge. X 80 linear. 



Figs. 6 and 7. — Two of the spicula from the ramuli. 

 X 80 linear. 



The greater number of these sponges are more or 

 less cup-shaped, and I have therefore selected that 

 form to illustrate the species ; figuring No. 3 as 

 affording an idea of the irregular fan-shaped speci- 

 mens. The species vary to as great an extent in size 

 as they do in form; some of the cup- shaped ones mea- 

 sui'ed more than ten inches in diameter at their distal 

 margins, and one of the fan- shaped specimens in my 

 possession, a flat specimen gradually expanding from 

 the base upward, measures nineteen inches in height, 

 and nineteen inches in breadth, near its distal extre- 

 mity. The larger specimens are usually in a moi'e or 

 less dilajiidatcd condition. 



