236 LIVERPOOL BIOLOGICAL SOCIETY. 
species. These differences are: 1. In Leucaltis pumila 
there are no tetracts with hook-hke rays, such as are found 
in Leucalt’s tmpressa. 2. The proportion in size of the 
eastral tetracts is different in the two species, the stalk 
bemg much longer in the new form. 3. The inner surface 
of the body-wall in Leucalt?s mpressa 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 pumilu has, according to 
Heckel, a very wide geographical distribution. It has 
been found at Guernsey by Norman; at Magador (coast 
of Morocco) by Heckel; at the Cape by Wilhelm Bleek ; 
and in the Indian Ocean (Bass Strait) by Wendt. 
Leucandra gosset, 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 Fleshwick Bay (April, 1890). It is one of the rarest 
calcareous sponges in our district. 
Leucandra johnstoni, 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. 
Leucandra 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 Puffin Island, April, 1889; and a few specimens 
also at Hilbre Island, June, 1889. An unusually large and 
_ highly corrugated specimen of it, recalling Leucandra john- 
stonia, C., was collected by Mr. Charles Walker at Flesh- 
wick Bay, April, 1890, 
