Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 - 0-2 MM. Fig. 15. Rhadinorhynchtis wheeleri. Anterior end of female, lateral view. </., dorsal proboscis-hook; s., body-spine; v., ventral proboscis-hook. 0-2 MM. Fig. 16. Rhadmorhynchmjohm. Anterior end of female, lateral view, d., dorsal pro- boscis-hook; s.,body-spine; v., ventral proboscis-hook. are much larger than those in the dorsal rows. The former (measured in a straight line from tip to insertion) reach a length of about 0-15 mm., while the latter are only about o-o6 mm. long. The spines on the a
Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 - 0-2 MM. Fig. 15. Rhadinorhynchtis wheeleri. Anterior end of female, lateral view. </., dorsal proboscis-hook; s., body-spine; v., ventral proboscis-hook. 0-2 MM. Fig. 16. Rhadmorhynchmjohm. Anterior end of female, lateral view, d., dorsal pro- boscis-hook; s.,body-spine; v., ventral proboscis-hook. are much larger than those in the dorsal rows. The former (measured in a straight line from tip to insertion) reach a length of about 0-15 mm., while the latter are only about o-o6 mm. long. The spines on the anterior portion of the body are small (0-025- 0-03 mm. long), and are arranged in fairly regular transverse ventral rows, extending well round on to the lateral surfaces. The proboscis-sac is about 1-1-3 mm. long. The lemnisci are apparently short, oval sacs. The eggs measure about 0-09 mm. x 0-025 mm. Of the species of Rhadinorhynchus already known, R. pristis (Rud., 1802), R. horridus (Liihe, 1912) and R. tenuicornis Van Cleave, 1918, are said to possess 14 longitudinal rows of hooks on the proboscis. The two first-mentioned species are much larger than the present form, while in all three the number of hooks per row is much larger (26 in pristis, about 26 in tenuicornis, 31 in horridus). Indeed, in no species oi Rhadinorhynchus hitherto described, so far as the writer is aware, is the number of hooks in each row less than about 20. Rhadinorhynchus johni, sp. n. (Fig. 16) This second species of Rhadinorhynchus occurred in the rectum of a hake {Merlucciiis sp.) off the Falklands (Station WS 73), March 7, 1927.
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