. Guide leaflet. 25-—THE TRUMPET SPONQE ( Tuba pliciftrn 246 THE AMERICAN MUSEUM JOURNAL from a common base, and connected with each other by root-likestolons, which form the attachments to the rocks on which theygrow. The texture of the skeleton is very fine and smooth. Tuba.—The genus Tuba is represented by two species and T. plicifera. These are more or less trumpet-shapedas the name implies. The specimen illustrated on page 245 isespecially fine. The Horny Sponges (order Monoceratida) includes the spongeswhose skeletons are entirely made of the spongin mos
. Guide leaflet. 25-—THE TRUMPET SPONQE ( Tuba pliciftrn 246 THE AMERICAN MUSEUM JOURNAL from a common base, and connected with each other by root-likestolons, which form the attachments to the rocks on which theygrow. The texture of the skeleton is very fine and smooth. Tuba.—The genus Tuba is represented by two species and T. plicifera. These are more or less trumpet-shapedas the name implies. The specimen illustrated on page 245 isespecially fine. The Horny Sponges (order Monoceratida) includes the spongeswhose skeletons are entirely made of the spongin most typical and most important of these are the commercial. F G- 26-—THE ZIMOCCA SPONGE {Euspon^/a zimocca Schulze) sponges. They are divided into the genera Euspongta andHippospongia. In addition to these the fine finger-like spongesof the genus Chalinopsilla, the black branching skeleton ofHircinia atra Whitfield (type) and the graceful cup-like-specimensof Stelospongia (see illustration on page 227) are worthy of note,although they possess no commercial value. THE COMMERCIAL SPONGES. The sponge of commerce is the elastic horny skeleton ofspongin from which all the living tissues of the animal have beenremoved. The principal sources of supply are: [32]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
