ISODICTYA. 139 



showing a tendency to branch, measuring from half to 

 three quarters of an inch long, have been thus deter- 

 mined by Dr. Bowerbank. I procured them among 

 the Hebrides, I think in the Minch (N.). 



48. ISODICTYA LOBATA (Montagu), n, 326 ; in, PI. LVIII, 

 figs. 1922. 



1867 Corybas lobata, Gray. Proc. Zool. Soc., p. 537. 



49. ISODICTYA PAUPEEA, Sow., n, 328 ; in, PI. LV, 

 figs. 47. 



1861 Halicliondria pauper a, Bowerbank. List British Marine 

 Invert. Fauna (Brit. Assoc.), p. 69. 



Habitat. Growing intermixed with Microciona plu- 

 mosa, between tide-marks at Herrn (N.). 



50. ISODICTYA UNIFORMIS, Bow., n, 329 ; in, PI. LY, 

 figs. 810. 



51. ISODICTYA CLARKEI, Bow., n, 330; in, PI. XLIX, 

 fig. 6 ; PI. LVI, figs. 1116. 



1861 Halichondria Clarkei, Bowerbank. List Brit. Marine 

 Invert. Fauna (Brit. Assoc.), p. 69. 



Habitat. Three fragments of this rare sponge, each 

 about three quarters of an inch long, are in my cabinet, 

 which probably when found formed one continuous 

 branch, and then would have been an inch and three 

 quarters long, and a sixth of an inch in greatest 



