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PLATE XLVUI. 



the same at its greatest breadth, a httle above half its 

 height. The distal end is one and a quarter inch 

 thick, and has three short mammiform cloacge pro- 

 jecting from it, about five lines high and of about the 

 same diameter, their terminal orifices varying from one 

 and a half to two lines in diameter. The proximal or 

 basal end is one and a half inch in breadth and five 

 lines in thickness ; it has not the natural basal surface, 

 but it appears to have been torn oif immediately above 

 it. The colour and surface characters of the sponge 

 are in perfect accordance with the other well-known 

 specimens, but the size and mode of its development 

 is diflTerent from any of those previously acquired. 

 The specimen represented by fig. 1 is very character- 

 istic of the general aspect of the sponge ; it was 

 obtained at Fowey, Cornwall, and was presented to me 

 by my indefatigable friend Mr. C. W. Peach. This 

 specimen is parasitical on a small tubular zoophyte, 

 and following its course it has assumed a lobular form ; 

 bus this is not the case in many other specimens. In 

 a fine one in the cabinet of the Hev. A. M. Norman the 

 sponge has apparently been based on a flat surface, and 

 is spread out evenly for two inches in length by one 

 inch in breadth, and of the uniform thickness of about 

 one eighth of an inch ; in this space there are three 

 simple oscula at about equal distances from each other, 

 and each about a line in diameter. The same flat 

 thinly-spreadiug character is apparent in other speci- 

 mens which I possess or have seen, and when in good 

 condition the same nut-brown colour prevails in all of 

 them in the dried state. In addition to the habitats 

 previously given I may state Fowey, Cornwall, b}^ Mr. 

 Peach ; Bantry Bay and Tobermory, Rev. A. M. 

 Norman, and I have received several specimens from 

 the Diamond Ground, off Hastings ; besides the large 

 one described above I have two specimens from the 

 Diamond Ground, which are based on the cai'apaces of 

 two Pisa (libbsii, and also a specimen from Shetland 

 on the root of a fucus. This species, therefore. 



