. Fresh-water biology. Freshwater biology. 3^4 FRESH-WATER BIOLOGY is about one-half as wide as the pharynx and orbicular in outUne. Apparently eyeless. White. Length 4 mm., breadth mm. Brooks, Carter Caves, Plagiostoma (?) planum Silliman 1885. Length mm., breadth mm. Mouth opening in anterior end. Pharynx hes within a sheath and has both longitudinal and transverse muscle layers. Radial muscle fibers pass from the base of the pharynx to the body wall. Without eyes or other sense organs. The poorly developed brain Kes in front of the phar- Sx as a transverse band. The i
. Fresh-water biology. Freshwater biology. 3^4 FRESH-WATER BIOLOGY is about one-half as wide as the pharynx and orbicular in outUne. Apparently eyeless. White. Length 4 mm., breadth mm. Brooks, Carter Caves, Plagiostoma (?) planum Silliman 1885. Length mm., breadth mm. Mouth opening in anterior end. Pharynx hes within a sheath and has both longitudinal and transverse muscle layers. Radial muscle fibers pass from the base of the pharynx to the body wall. Without eyes or other sense organs. The poorly developed brain Kes in front of the phar- Sx as a transverse band. The intestine is capacious and has short era] diverticula. This species probably belongs to the genus Prorhynchus. Fig. 649. Plagiostoma (?) planum, ph, pharynx; d, intestine. X about 30. CAfter Silliman.) Acmostomum crenulatum Schmarda 1859. The body is cylindrical, yellowish, 1 mm. long. Pharynx cylindrical, protractile with six deep lobes on its margin. Otolith large and spherical contained within a transparent capsule which is located at the end of the first third of the body. The ovaries form a large spherical mass in the posterior part of the body. The cirrus is short knife-shaped and has a slight double curve. Found in brackish water, Hoboken, N. J. Fig. 650. Acmostomum crenulatum. From life. X about 30. *=^ "immm^' (After Schmarda.) Dendrocoelum sp. Pearl 1903. Agrees with description of Dendrocoelum ladeum, except in respect to the color. Color ranges from a Ught grey to nearly black, and is uniform. Found about Ann Arbor, Mich. IMPORTANT REFERENCES ON NORTH AMERICAN FRESH- WATER TURBELLARIA Graff, L. von. 1882. Monographie der Turbellarien. I RhabdocoeUda. Leipzig. 1904-1912. Bronn's Klassen und Ordnungen des Tierreichs. IV. Bd., Wiir- mer: Vermes, Turbellaria, Acoela, and Rhabdocoela. Leipzig. 1911. Acoela, Rhabdocoela und AUoeocoela des Ostens der Vereinigten Staaten von Amerika. Zeitschr. f. wiss. ZooL, 99 : 321-428. Taf. I-VI. Silliman, W. A. 1885. Beobachtungen i
Size: 1184px × 2111px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
