PORIFERA OF THE L.M.B.C. DISTRICT. 937 
It generally forms small white patches on the rocks, 
and is easily recognizable. 
Sycandra ciliata, Fleming. 
Owing to an oversight Sycandra ciliata was not re- 
corded in the two previous reports as having been found 
at Huilbre Island. It had been collected there in the 
summer of 1885 by the members of the Liverpool Marine 
Biological Committee,* and I have found a few small 
specimens of it mm the same locality in March, 1890. 
Common in other parts of the district. 
EXPLANATION OF THE PLATES. 
ch. choanosome. m. gastric cavity. 
cy. cystenchymatous tissue. p.a. pore area. 
d.m. dermal membrane. p.c. “ problematic cells.”’ 
é. ectosome. pg. pigment cells. 
e.c. exhalent canals. — pr. prionorrhabds. 
j.c. flagellated chambers. — s.c. subdermal cavities. 
2.c. inhalent canals. s.l. layer of scleroblasts (?). 
PLATE X. 
Fig. 1. Vertical section through outer portion of Halisarca 
rubra, N. Sp., semi-diagrammatic (xX 250). 
Fig. 2. Vertical section through inner portion of Halisarca 
rubra, n. sp. (X 250). Itis doubtful whether 
the parts in figs. 1 and 2, named “‘i. ¢c.,” are 
inhalent or exhalent canals. 
Fig. 3. Awinella mammillata, n. sp., natural size. 
Hig. 4. Scleroblasts (?) of Awenella mammillata (X 800). 
Fig. 5. Portion of a longitudinal section through one of 
the papillee of Awinella mammillata (X 150). 
PuATE XI. 
Fig. 1. Chalina montagw, Johnston, natural size. 
*W., A. Herdman, in ‘‘ Introduction” to ‘‘ Fauna of Liverpool Bay,” Vol. I. p. 8. 
