236 LIVEEPOOL BIOLOGICAL SOCIETY. 



species. These differences are : 1. In Leucaltis pumila 

 there are no tetracts with hook-hke rays, such as are found 

 in Leucaltis impressa. 2. The proportion in size of the 

 gastral tetracts is different in the two species, the stalk 

 being much longer in the new form. 3. The inner surface 

 of the body-wall in Leucaltis impressa appears not to be pro- 

 vided with triacts in addition to tetracts as in Leucaltis 

 pumila. 4. Bowerbank mentions the " very large size of 

 the surface spicula" in Leucaltis pumila, of which there is 

 no trace in our species. 



I may mention that Leucaltis piimila has, according to 

 Hseckel, a very wide geographical distribution. It has 

 been found at Guernsey by Norman ; at Magador (coast 

 of Morocco) by Haeckel ; at the Cape by Wilhelm Bleek ; 

 and in the Indian Ocean (Bass Strait) by Wendt. 

 Leucamira gossei, Bowerbank. 



This form had previously been recorded from Port Erin 

 and Holyhead. A few specimens of it have been collected 

 again at Port Erin (April, 1889, and April, 1890), and also 

 at Flesh wick Bay (April, 1890). It is one of the rarest 

 calcareous sponges in our district. 

 Leucamira jolinstoni, Carter. 



A number of fine specimens of it were collected by me 

 at Fleshwick Bay, Isle of Man, and a few also at Port 

 Erin, in April, 1890. It had previously been found at Port 

 Erin and Holyhead. 

 Leucamira nivea, Fleming. 



In Mr. Higgin's report this species was recorded from 

 the Isle of Man only. I have found it since, and in pro- 

 fusion, at PufHn Island, April, 1889 ; and a few specimens 

 also at Hilbre Island, June, 1889. An unusually large and 

 highly corrugated specimen of it, recalling Leucamira john- 

 stonia, C, was collected by Mr. Charles Walker at Flesh- 

 wick Bay, April, 1890. 



