. Bulletin. Natural history; Natuurlijke historie. 30 A SYSTEMATIC STUDY OF THE DEMOSPONGIAE OF JAMAICA Indies. P. carbonaria (Lamarck) as described by de Laubenfels from Dry Tortugas is a black sponge with larger oxeas and a network of subdermal canals. The white P. coela de Laubenfels (1950a) of Bermuda differs from the Jamaican sponges by its smaller spicules and less robust spicule tracts. The type species of Pellina, P. seinitubulosa, de- scribed from the Mediterranean, is also white in color. The Adriatic specimens studied by Babic (1922) and Keller (1878) do have spicules similar in siz
. Bulletin. Natural history; Natuurlijke historie. 30 A SYSTEMATIC STUDY OF THE DEMOSPONGIAE OF JAMAICA Indies. P. carbonaria (Lamarck) as described by de Laubenfels from Dry Tortugas is a black sponge with larger oxeas and a network of subdermal canals. The white P. coela de Laubenfels (1950a) of Bermuda differs from the Jamaican sponges by its smaller spicules and less robust spicule tracts. The type species of Pellina, P. seinitubulosa, de- scribed from the Mediterranean, is also white in color. The Adriatic specimens studied by Babic (1922) and Keller (1878) do have spicules similar in size to those of my speci- mens. Topsent's Mediterranean specimen, however, has more robust oxeas and a second category of small ectosomal microxeas. He reported an extensive network of subdermal canals in the basal regions of his material. Schmidt (1862, 1870) and Topsent both emphasized the presence of a well-developed, easily detachable skin in their specimens. The Jamaican sponge, by contrast, has a closely adherent dermal skeleton. Genus SIGMADOCIA de Laubenfels Sigmadocia caerulea n. sp. (Text-fig. 5; plate IH, fig. 4) A. 50// Fig. 5. —Spicules of Sigmadocia caerulea. A. Oxea. B. Sigmas. YPM 5037. Holotype. HoLOTYPE. YPM 5037. Rasta's wreck. July 19, 1959. Habitat. Common on pilings and mangrove roots on the outside of the Port Royal mangrove thicket. Sponges of similar appearance were collected at Drunkenman's Cay in a sandy turtle grass bed. Shape. The base is thickly incrusting to massive. Many of the oscules, particularly in the Port Royal specimens, are at the apex of cylindrical to volcano-shaped projections which may be several centimeters in height. The projections have axial cloacae and thick walls. Color. Both the surface and the interior are light blue in the living sponge. The specimens become beige to drab in alcohol. Consistency. The Port Royal specimens are soft but very easily broken. The speci- mens from Drunkenman's Cay are heavily penetrated by coarse al
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