. Bulletin. Natural history; Natuurlijke historie. 44 A SYSTEMATIC STUDY OF THE DEMOSPONGIAE OF JAMAICA new genus, Axocielita, for M. similis on the erroneous assumption that all its megascleres are smooth. Axocielita is therefore a synonym of Microciona. The species conforming to de Laubenfels' definition of Axocielita can be included within Axociella Kallmann. De Laubenfels used Axociella for massive sponges with the same spicule complement as the incrusting species placed in Axocielita. The species which must be transferred or returned to Axociella include Axociella calla de Laubenfels, 193
. Bulletin. Natural history; Natuurlijke historie. 44 A SYSTEMATIC STUDY OF THE DEMOSPONGIAE OF JAMAICA new genus, Axocielita, for M. similis on the erroneous assumption that all its megascleres are smooth. Axocielita is therefore a synonym of Microciona. The species conforming to de Laubenfels' definition of Axocielita can be included within Axociella Kallmann. De Laubenfels used Axociella for massive sponges with the same spicule complement as the incrusting species placed in Axocielita. The species which must be transferred or returned to Axociella include Axociella calla de Laubenfels, 1934; Axocielita kilauea de Laubenfels, 1951a; Axocielita linda de Laubenfels, 1954a; and Ophlitaspongia membranacea Thiele, 1905. Microciona aceratoobtusa Carter, 1887, has styles with microspined heads, and can best be retained in Microciona. The presence of a graded series of intermediates between Microciona and Axociella suggests that the validity of de Laubenfels' family Ophlitaspongiidae is open to question. Genus THALYSEURYPON de Laubenfels Thalyseurypon conulosa n. sp. (Text-fig. 9; plate VL fig- 1). 100// Fig. 9. —Spicules of Thalyseurypon conulosa. A. Subtylostyles. B. Acanthostyle. YPM 5042. Holotype. HoLOTYPE. YPM 5042. Off Maiden Cay, August 12, 1961. Habitat. The single specimen was collected in about 10 feet of water near Maiden Cay. Shape. The lobate sponge arises from a narrow region of attachment. It attains a maximum height of 8 cm and a maximum overall width of 10 cm. The partially fused lobes are 1-2 cm in diameter and several centimeters in height. The sponge is a dark purple with a reddish tinge in life and retains that color in alcohol. The sponge emits a purplish exudate and darkens the preservative. Consistency. Compressible, but tough and difficult to tear. Surface. The surface is strongly conulose. The conules are 3-6 mm in height, fre- quently mm in thickness, and often bifid. Adjacent conules are 2-5 mm apart and are often connected by thick rid
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