File:Bulletin (1909) (20427836391).jpg

Title: Bulletin
Identifier: bulletin69smit (find matches)
Year: 1909 (1900s)
Authors: Smithsonian Institution; United States. Dept. of the Interior; United States National Museum
Subjects: Science
Publisher: Washington, Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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26 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. Internal anatomy. Nervous system.—The lateral longitudinal nerves (fig. 18, I. n.) are large and well developed, located in the lateral portions of the segment inside the inner layer of longitudinal muscles. Musculature.—The longitudinal muscles (fig. 18) are arranged in numerous small bundles disposed in two layers close together, and a considerable distance from the surface of the segment. Dorsoventral fibers are numerous. Trans- verse fibers are compara- tively few, in relation with the outer and inner sides of the inner longitudinal mus- cles which they cross at right angles. Excretory system. — The excretory system is well de- veloped. The dorsal (fig. 18, (I. ex.) and ventral ca- nals (fig. 18, r. ex.) are located a considerable dis- tance mediad from the lat- eral nerves. The ventral canal is much the larger, measuring in places 80ju, in diameter, whereas the dor- sal canal measures less than 8/i,. The ventral canals are connected by a transverse canal in the posterior por- tion of each segment, and also send off anastomosing branches which run among the various organs of the Fig. is.—rhabdometea NnLLicoLLis: heab and segment and also form a ANTERIOR PORTION OF STROBILA. ' i • i plexus, which extends later- ally on each side of the segment as far as the lateral longitudinal nerve. The vagina and cirrus pouch pass between the dorsal and A^entral excretory canals and dorsal of the lateral nerve. Male reproductive organs.—The testicles (figs. 17, 18, 20, t.) are about 60 in number, arranged in two layers in the middle field, in the posterior portion of the segment. They measure from 80 to 100;U, in diameter when fully developed. The mass of testicles is hollowed out in front, and this depression is occupied by the female
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