. Süßwasser-Biologie. Süßwasser-Biologie. Die Schwämme (Porifera) 3" 34{33) Birotulates oft mehr als der Durchmesser der rotules. Ephydatia crateriformis (Potts) 1882. Schwamm inkrustierende, dünn. Gemmules kleine, weiße, sehr zahlreich. Granulare Kruste von gem-mules extrem dick, die Foraminalen Röhrchen in einem Krater - wie Depressionen. Skelett spicules Schlank, allmählich hingewiesen, dünn microspined. Birotulates sehr lang und schlank, Wellen reichlich Spined. Rotules von drei bis sechs kurze recurved Haken. Im flachen Wasser, schnell fließende Flüsse; Schuylkill und Delaware, Pennsylvania. Durch F gefunden

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. Fresh-water biology. Freshwater biology. THE SPONGES (PORIFERA) 3" 34 {33) Birotulates many times longer than diameter of rotules. Ephydatia crateriformis (Potts) 1882. Sponge encrusting, thin. Gemmules small, white, very numerous. Granular crust of gem- mules extremely thick, the foraminal tubes in a crater-like depression. Skeleton spicules slender, gradually pointed, sparsely microspined. Birotulates very long and slender, shafts abundantly spined. Rotules of three to six short recurved hooks. In shallow water, rapidly flowing; Schuylkill and Delaware Rivers, Pennsylvania. Found by F. Smith in the Sangamon River, Dl. Annandale places this species in Spongilla owing to the imperfect development of the rotules (see Fauna of British India; Fresh-water Sponges, 191T, p. 83). Bowerbank, in 1863, described, under the name of Spongilla bail' eyi, a sponge from a stream at Canterbury Road, West Point, N. Y., which may be the same as this species. The description is too in- complete to allow of an accurate determination. His description is quoted by Potts (1887: 227) Fig. 572. Spicules of Ephydatia crateriformis. Three types ol spicules figured here; slender microspined skeleton spicules; mature gemmule birot- ulates with short hooked rays; supposed immature forms. X loo. (After Potts.). 35 (20, 36) Dermal spicules, minute birotulates. Ephydatia everetti (Mills) 1884. Sponge green consisting entirely of slender filaments, little more than a sixteenth of an inch in diameter. Gemmules few, but usu- ally large with a thick crust. Skeleton spicules slender, cylindrical, smooth. Dermal spicules, minute birotulates with slender cyhndrical shafts and cap-like rotules notched into five or six hooks. Gemmule birotulates long and club-like; shafts smooth and slender; rotules formed of five or six stout, recurved, acuminate hooks. In cold water, Berkshire County, Mass., and Nova Scotia. Fig. 573. Spicules of Ephydatia everetti. Four types of spicules figured here: smooth, ske

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• bookcentury1900
• bookdecade1910
• booksubjectfreshwa
• bookyear1918