. Bulletin. Science. 42 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. Genus DIORCHIS Clerc, 190S. (For generic diagnosis see p. 98.) DIORCHIS ACUMINATA (Clerc, 1902) Clerc, 1903. Figs. .30-30. Drepanidotcenia acuminata Clerc, 1902a. p. f>59, figs. ?>. 4. Diorchis acuminata (Clerc, 1902) Clerc, 1903, pp. 24S, 249, 255. 281-284, pi. 8, fig. 13; pi. 9, fig. 25; pi. 11, figs. 78, 79. Diorchis accuminata Clerc, 1903, p. 249 (misprint for D. acuminata). Taenia acuminata Clekc, 1903, p. 283 Specimens of a tapeworm (from the collection of H. B. Ward, de- posited in the U. S. National Museum Helmin
. Bulletin. Science. 42 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. Genus DIORCHIS Clerc, 190S. (For generic diagnosis see p. 98.) DIORCHIS ACUMINATA (Clerc, 1902) Clerc, 1903. Figs. .30-30. Drepanidotcenia acuminata Clerc, 1902a. p. f>59, figs. ?>. 4. Diorchis acuminata (Clerc, 1902) Clerc, 1903, pp. 24S, 249, 255. 281-284, pi. 8, fig. 13; pi. 9, fig. 25; pi. 11, figs. 78, 79. Diorchis accuminata Clerc, 1903, p. 249 (misprint for D. acuminata). Taenia acuminata Clekc, 1903, p. 283 Specimens of a tapeworm (from the collection of H. B. Ward, de- posited in the U. S. National Museum Helminthological Collection, No. 7237) collected in Nebraska from Fulica americana apparently belong to the species Diorchis acuminata. External anatomy. These specimens measure 35 mm. in length by mm. in maximum breadth. The final segments were not yet gravid, and it is consequently evident that the full-grown worm may be considerably larger than indi- cated by the above figures. The head (figs. 30, 31) measures 160;u, in length by 225 to 235/^ in width. The rostel- lum is cylindrical when protruded, slightly broader at the tip than at the base, measur- ing 100/x in length by 50/x in diameter at the base and 70ja in diameter at the tip. It is armed with 10 hooks (fig. 32), with long dorsal and short ventral root and measuring 38|U in length, the dorsal root being 25/x, and the prong 13/x in length. The suckers are about 80ju, in diameter and are armed with minute spines less than 5ju, in length, set close together in diagonal rows covering the entire surface of the sucker- Segmentation begins very close behind the head, and in this region the strobila is of about the same breadth as the head. The breadth then becomes re- duced to about 150|Li and afterwards gradually increases throughout the remainder of the strobila. The segments are broader than long, the largest measuring 80/i in length by 650^ in I 1 lOQir. Fig. 30.—DioKCHis acumi- nata : Head and an- terior porti
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