The porifera and coelentera . diverticula anastomosingto form the tubar system ; d, small colony with two oscula ; osc, osculum ; iliv, diverticula. Fio. 3.—Small colony of Lciicosolenia Lieberkiihnii, , X6. osc, osculum ; div, diverticula. Fio. 4.—Arborescent colony of Leiicosolenia complicata, Mont., x6. Fio. 5.—Creeping colony of Leucosolcnia variahilis, H., with numerous erect, and for themost i)art simple, oscular tubes, arising from a creeping stolon, x 6. single—that is to say, where the sponge retains a single osculum andgastral cavity. The wall of a primitive vase-like spon
The porifera and coelentera . diverticula anastomosingto form the tubar system ; d, small colony with two oscula ; osc, osculum ; iliv, diverticula. Fio. 3.—Small colony of Lciicosolenia Lieberkiihnii, , X6. osc, osculum ; div, diverticula. Fio. 4.—Arborescent colony of Leiicosolenia complicata, Mont., x6. Fio. 5.—Creeping colony of Leucosolcnia variahilis, H., with numerous erect, and for themost i)art simple, oscular tubes, arising from a creeping stolon, x 6. single—that is to say, where the sponge retains a single osculum andgastral cavity. The wall of a primitive vase-like sponge may increase duringgrowth either in superficial extent or in thickness, or in both ways atonce. We may consider first the results of an increase in the 6 SPONGES surface of the body wall. In the first place, such increase may takeplace more or less evenly and regularly in all parts, hut morerapidly in one direction than in another; then the sponge personbecomes an elongated cylinder or tube if the growth be chiefly. Yonng specimen of CluthriiM lUii^alum, , wrth one osculum, x6. vertical, or assumes the form of a cup or saucer if the growth bechiefly horizontal. In the second place, the growth may be unevenor irregular, being more rapid in one part of the sponge body thanin another, or taking place chiefly in certain limited regions. In
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
