Mr. A. Hancock on the Esccavating Sponges, 237 



of four new foreign species. The characters of the additional 

 spicula in the former are put in italics, so that the reader may- 

 see at a glance what is now added. 



Cliona celata, PI. VII. fig. 7. 



Spicula pin-like^ long and stout, a little fusiform and some- 

 what bent, measuring upwards of -t-',j of an inch in length ; the 

 head is well defined, globular, approaching to ovate, with gene- 

 rally a terminal obtuse point, being placed not exactly at the 

 end of the shaft. 



Cliona gorgonioides. 



Spicula pill-like, large and stout, measuring -yV of an inch 

 long; the head oval, and frequently at some little distance from 

 the extremity; thence the shaft gradually tapers to the other 

 or pointed end, and is usually much bent, particularly towards 

 the head, and sometimes the pointed extremity is a little recurved. 



This is a critical species, and is probably a mere variety of 

 C. celata. 



Cliona Northumhrica. PI. VII. fig. 1. 



Spicula of three kinds. The 1st much the largest, measuring 

 -^}j of an inch in length, is pin-like, straight, sharp-pointed, with 

 the head large, round, and terminal : the 2nd kind is fusiform, 

 scarcely more than one-fourth the length of the first, rather 

 stout, much and suddenly bent in the centre, with both ends 

 sharj)ly pointed, and when viewed through the ^th-of-an-inch 

 object-glass is seen to be minutely spinous : the Si'd form is 

 very minute^ being not more than --yVo ^i^cJi long ; it is cj/lindrical, 

 bent sharply in the centre, and apparently smooth under the ^-inch 

 object-glass, though occasionally there are slight indications of 

 spines ; the extremities are recurved,, slightly enlarged, and rounded. 



The second and third forms are more numerous than the first, 

 which is most abundant in the papillae. 



AVhen dry, the sponge is of a pale, clear ochreous-yellow co- 

 lour. Since the publication of my former paper, a few additional 

 specimens have occurred on the Northumberland coast, and one 

 in an oyster-shell, probably from Scotland, 



Cliona vastifica. PI. VII. fig. 2. 



Spicula of three kinds. The first pin-like, -^\- inch in length, 

 straight, rather slender, and diminishing imperceptibly to a very 

 fine point at one end, the other terminating in a perfectly 

 globular head : the second kind is about one-third the length of 

 the first, and is mucli thinner; it is stoutish in the centre, 

 where it rather suddenly bends a little, and thence tapers 

 gradually towards the ends, which arc sharply pointed; it is 



