18 PERCY SLADEN TRUST EXPEDITION 
these small spicules is, however, not well represented ; the sinuosity of the rays and the 
swelling of their extremities being exaggerated. He does not figure the characteristic 
small, regular tri- and quadriradiates of the chamber layer, though these are abundantly 
present in his specimen. The canal system of the sponge, though no longer well 
preserved, is evidently closely similar to that described by Poléjaeff and Dendy for 
“ Heteropegma nodus gordi.” 
Similarly an examination of a specimen of Ridley’s Leucaltis bathybia var. mas- 
carenica, received from the British Museum, proves conclusively that this also is really 
Leucaltis clathria. 
In 1892 I showed that Carter’s Clathrina latitubulata is in reality a “ Heteropegma,” 
but thought that it might be distinguished from H. nodus gordw of Poléjaeff by shght 
spicular peculiarities. Further investigation has convinced me that such differences in 
spiculation as exist cannot be regarded as of specific value. 
Previously known Distribution. Coast of Florida (Haeckel); off Bermudas (Polé- 
jaeff) ; Cape York, Torres Straits (Poléjaeff); near Port Phillip Heads (Carter, Dendy) ; 
Ceylen (Dendy); West Coast of Portugal (Hanitsch); Amirante group, Seychelles 
(Ridley), Wasin, E. Africa (Jenkin). 
Register Nos., Localities, &c. XXx1x. 1 and xc. 3, Cargados Carajos, 45 fathoms ; 
LXXVI. 3, xc. 2 and cv. 1, Amirantes, 28—29 fathoms; cx. 11 and cx. 2, Egmont 
Reef. 
Family Sycettide Dendy. 
Flagellated chambers elongated, arranged radially round a central gastral cavity, 
their ends projecting more or less on the dermal surface and not covered over by a 
continuous dermal cortex strengthened by tangential dermal spicules. Tubar skeleton 
articulate, with subgastral sagittal radiates. Collared cells usually confined to the 
radial chambers in the adult, and probably always with apical nuclei. 
Genus Sycon Risso (emend.). 
Radial chambers usually more or less united in places where they come in contact 
with one another, always crowned distally with tufts of oxeote spicules. Properly defined 
inhalant canals usually present, which may be covered by a thin, pore-bearmg dermal 
membrane without special skeleton. 
Sycon? sp. 
Three very minute Syconoid sponges were picked out from amongst other specimens 
from Coetivy, but when I came to examine them microscopically, I found that all the 
spicules had been completely dissolved out, presumably by some acid in the spirit in 
which they were kept. They probably belong to the genus Sycon and are most likely 
immature. 
