. Fresh-water biology. Freshwater biology. Resembles A. plumosa. In profile the rays of the longer gemmule spicule have almost the form of a J. Ohio and Illi- nois. At Granite City, 111., specimens were taken from settling tanks of the city water works, measuring 42 x 12 X 8 cm. Fig. 576. mount.) Spicules oi Asteromeyenia radiospiculata. X 100. (From 41 (38) Dermal spicules acerate if present. Heleromeyenia Potts . 42 Spongillidae producing gemmules with birotulate spicules of two distinct classes, long and short. Margins of rotules not smooth but dentate or incised. 42 (43) Rotules of gemmule
. Fresh-water biology. Freshwater biology. Resembles A. plumosa. In profile the rays of the longer gemmule spicule have almost the form of a J. Ohio and Illi- nois. At Granite City, 111., specimens were taken from settling tanks of the city water works, measuring 42 x 12 X 8 cm. Fig. 576. mount.) Spicules oi Asteromeyenia radiospiculata. X 100. (From 41 (38) Dermal spicules acerate if present. Heleromeyenia Potts . 42 Spongillidae producing gemmules with birotulate spicules of two distinct classes, long and short. Margins of rotules not smooth but dentate or incised. 42 (43) Rotules of gemmule spicules of smaller class finely serrated. Heteromeyenia ryderi Potts 1882. Sponge massive, often hemispherical. Gemmules numerous, crust thick, foramina short and inconspicuous. Skeleton spicules grad- ually pointed, entirely spined except at the tips. Dermal spicules wanting. Shafts of long birotulates spined, rotules of three to six short recurved hooks, sometimes umbonate. Rotules of small birot- ulates nearly as great in diameter as the length of their shafts. Shafts smooth or with few spines. Shallow flowing water, Florida to Nova Scotia, and inland at least as far as Iowa. Fig. 577. Spicules of Heteromeyenia ryderi. Four types of spicules figured here: skeleton spicule; long gemmule birotulates, hooked and spined; short birotulates: surface of rotules, margins lacinulate, surface microspined or granulated; spherical amorphous spicule. X lOO. (After Potts.). 43 (42) Rotules of gemmule spicules of small class coarsely serrate. 44. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
