107 



PLATE XLIV. 



Halichondeia Thompsoni, BoiverbanJc. 



Vol. ii, p. 243, ' Mon. Brit. Spongiadee.' 



Figs. 1 and 2. — Eepresent tlie largest two of 

 three specimens obtained by the Rev. A. M. Norman, 

 at Jersey, 1867. The specimens were preserved in 

 spirit ; but they are figured in the dried state, of the 

 natural size. The original of No. 1 is in the cabinet 

 of Mr. Norman; that of No. 2 he kindly presented 

 to me. The third specimen in the possession of Mr. 

 Norman is less in size than the one represented by 

 No. 2. 



I applied through my friend Mr. Robert Patterson 

 to the Museum of Belfast for the loan of the type- 

 specimen, that it might be figured, but I regret to 

 say that it could not be found. 



Fig. 3. — One of the skeleton spicula. X 150 

 linear. 



Fig. 4. — A tension spiculum, from the interstitial 

 membranes. X 150 linear. 



Fig. 5. — One of the bidentate, equi-anchorate, 

 retentive spicula, from the dermal membrane. 

 X 530 linear. 



IsoDiCTYA SIMPLEX, Bowerbank. 



Vol. ii, p. 294, ' Mon. Brit. Spongiadae.' 



Fig. 6. — Represents the largest specimens of the 

 species that I have seen in the condition in which it 

 came from the sea, having been preserved in spirit 

 by the Rev. A. M. Norman, who dredged it in 

 Strangford Lough, Ireland, October 8th, 1869. It 

 is attached to a small pebble (a), and some minute 

 fuci are partly enveloped in its substance at (b). 

 Natural size. Specimen in the cabinet of the Rev. 

 A. M. Norman. 



