304 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
situated, as in the specimens of 7. lyncurium, at the summit of a very small 
papilla. : 
The sponge itself and the spicular measurements agree exactly with those 
described and figured by Keller (18). 
A third specimen, which is dark brown in colour, has also been assigned 
to this species. It is very small indeed, being only 15 mm. in greatest 
diameter ; and only a very few of the characteristic irregular, somewhat 
branched oxyasters were seen. 
Locality. One specimen was obtained from the Htulah Shoals, Suez Bay ; 
and two others from Khor Dongonab. 
Distribution. Red Sea, Seychelles, Australia, Philippines, Brazil, Porto 
Rico. 
TETHYA LYNCURIUM, Linneus. 
All the specimens obtained by Mr. Crossland, referable to this species, are 
small subspherical cushions attached to rock or coral by a large base. The 
largest is 30 mm. in diameter and about 25 mm. from base to summit. They 
each possess, exactly in the centre of the cushion, a small papilla, at the top 
of which occurs an osculum ; and in no specimen could a second oseulum be 
seen. The surface of the sponge is quite smooth, and the brush-like ends of 
the spicule-bundles show clearly. The colour in spirit is white. 
The spiculation and spicule measurements agree exactly with those given 
by Dendy (11) for 7. lyncuritum, var. a, of the Ceylon Sponges. They also. 
agree very closely with those of T. seychellensis, save that the irregular and 
sometimes branched oxyasters of the latter are lacking in these specimens. 
Locality. Five specimens occur in the collection—one trom Suez, the 
others from Tella Tella Kebira. 
Distribution. Red Sea, Ceylon, North Atlantic, Porto Rico, Mediterranean.. 
Family SUBERITID4Z. 
Astrotetraxonida in which the megascleres are styli or tylostyl, and in 
which the microscleres have completely disappeared. 
SUBERITES CARNOSUS, Johnston. 
Synonymy : 
1842, Suberites carnosus, Johnston (17). 
1900. Suberites carnosus, Topsent (34). With complete synonymy. 
1891. Suberites carnosus, Keller (18). 
Locality. Two specimens of this cosmopolitan species were obtained in 
Suakin Harbour. The larger measures 75 mm. x 55 mm. 
Distribution. Red Sea, Atlantic Ocean, Mediterranean, Indian Ocean, 
Australia. 
