. Bulletin. Natural history; Natuurlijke historie. 10// Fig. 15.—Spicules of Corticium tetralophum. Tetralophs. YPM 5047. Holotype. Spicules, (a) Tetralophs, 17-30 ju, in total diameter (100 spicules). The protoclads are 3 ^u, in diameter. They bear 2-6, typically 4, deuteroclads. The latter are about equal in length to the protoclads. The smooth protoclads are 1-2 ix in basal diameter. Smooth and rough or spiny deuteroclads may be present on the same spicule. A typical spicule has 4 similar deuteroclads on each of the 4 rays. A rhabd cannot be distinguished from 3 clads. (b) Very rare triloph
. Bulletin. Natural history; Natuurlijke historie. 10// Fig. 15.—Spicules of Corticium tetralophum. Tetralophs. YPM 5047. Holotype. Spicules, (a) Tetralophs, 17-30 ju, in total diameter (100 spicules). The protoclads are 3 ^u, in diameter. They bear 2-6, typically 4, deuteroclads. The latter are about equal in length to the protoclads. The smooth protoclads are 1-2 ix in basal diameter. Smooth and rough or spiny deuteroclads may be present on the same spicule. A typical spicule has 4 similar deuteroclads on each of the 4 rays. A rhabd cannot be distinguished from 3 clads. (b) Very rare trilophate spicules, with the unbranched ray shortened or bent. The spicules are similar in size to the tetralophs. (c) Rare, thin triradiates and tetraradi- ates, 10-17 fx in total diameter (15 spicules). Some or all of the rays are terminally branched. The rays are only \ jx in basal diameter. The spicules may be developmental stages of the tetralophs and trilophs. Discussion. The species is characterized by the lack of a special category of heterolo- phose candelabra. In addition, modified calthrops are absent. Two other species of Corticium occur in the West Indies. C. versatile Schmidt, 1880, has peculiar candelabras and variously modified caltlirops. C. quadripartitum Topsent, 1923, has special dermal heterolophose candelabras. Its tetralophs are similar in form to those of the Jamaican sponge but are slightly larger in size. Distribution by Habitat The sponge fauna of individual habitats can now be summarized. (A) Port Royal Docks: The common species are: Ircinia fasciculata Halichondria melanadocia Ircinia strobilina Tedania ignis Darwinella rosacea Microciona microchela Desmapsamma anchorata Microciona rarispinosa lotrochota biro tula ta Mycale laevis Gelliodes areolata The following species were present but less common: Verongia fistularis Placospongia carinata Dysidea fragilis Zygomycale parishii. Please note that these images are extracted from scanned page images that m
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