76 PLATE XXX. 



acquired three others which were found by Mrs. Brett 

 at the same locality as the type one. One of them is 

 one inch and two lines in length, and nine lines in 

 breadth ; the second one is rather less in size, and the 

 third one about the size of the figured specimen. The 

 oscula are more numerous in all the three, and are 

 rather more elevated above the dermal surface of the 

 sponge. In every other respects they agree very 

 closely with the type -specimen. 



HYMENIACIDON FEAGILIS, Bowerbanfc. 



Vol. ii, p. 159, ' Mon. Brit. Spongiad^.' 



Fig. 10. Represents an average-sized specimen of 

 the sponge in the dried state of the natural size. 



Fig. 11. One of the slender fusiformi-acerate spicula 

 of the dermal membrane. X 1-50 linear. 



Fig. 12. A fusiformi-acerate, stout, skeleton spicu- 

 lurn. X 150 linear. 



This species appears to be very local in its habits. 

 I found it near the mouth of the Dart about twenty- 

 five years since, and I have never seen or heard of a 

 specimen having been found in any other locality. 



