R. W. H. ROW—REPORT ON THE SPONGES : CALCAREA. 205 
A single specimen of this species was obtained at Suez. 
Instribution, Red Sea. 
Family AMPHORISCIDA, Dendy. 
LEUCILLA BATHYBIA (Haeckel). 
Synonymy ; 
1872. Leucaltis bathybia, Heckel (8). 
1877. Leucaltis bathybia, SchufMer (16). 
Three specimens were obtained from a buoy in Suez Harbour. 
Distribution. Red Sea; Amirante Is., Australia. 
LEUCILLA INTERMEDIA, sp.n. (PI. 20. fig. 7.) 
The specimens in the collection are small, irregularly massive, and usually 
with a single osculum at the top; there are no specimens present in which two 
oscula occur. They vary in diameter, the largest being 8 mm. at its widest 
part, which is close to the base. 
The canal-system is sylleibid, with slightly elongated flagellated chambers 
arranged in groups round wide exhalant canals (PI. 19. fig. 7). 
The spiculation of the chamber-layer is irregular. 
Skeleton arrangement. (PI. 19. fig. 7.) 
A. Dermal cortex. 
(i.) Quadradiates (Text-fig. 5, a).—Large slender quadriradiates usually 
with the basal ray slightly longer than the paired rays, but spicules occur 
with the basal ray much the shortest. All the facial rays are straight and 
equal in diameter. They are also of the same diameter throughout nearly 
the whole of their length, the ends being somewhat abruptly pointed in most 
cases. In the case of those spicules which have a short basal ray, however, 
the basal ray tapers gradually throughout its length. The facial rays are 
not orientated in any special direction. The apical ray, which is directed 
gastralwards, is small and slender. 
(ii.) Triradiates (‘Text-fig. 5, d).—A thin irregular layer of regular, tan- 
gentially placed triradiates occurs interspersed among the quadriradiates. 
The rays are straight, equal in length, and taper gradually from base to 
point. The spicules are scattered over the surface of the sponge without 
regard to orientation. 
B. Gastral Cortex. 
The spiculation of the gastral cortex consists entirely of small sagittal 
quadriradiates with extremely short apical rays (text-fig. 5,b). They form 
a dense but thin layer over the gastral surface of the sponge. The facial rays 
are all equal in length, and of the same diameter. They taper gradually 
