Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 NEMATODA 553 branches. One of these has a tendency to turn forward at first, but ultimately turns posteriorly parallel to the other. Both turn forward again at a short distance from the anus, and the ovaries lie in the prevulvar region. The eggs are small (o-04-o-045 mm. X 0-025-0-03 mm.) and oblong-oval. They have thick shells, apparently without the polar filaments described for the genotype. Owing to the absence of a full description of the genotype of Spinitectiis, the sys- tematic position of this genus is s
Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 NEMATODA 553 branches. One of these has a tendency to turn forward at first, but ultimately turns posteriorly parallel to the other. Both turn forward again at a short distance from the anus, and the ovaries lie in the prevulvar region. The eggs are small (o-04-o-045 mm. X 0-025-0-03 mm.) and oblong-oval. They have thick shells, apparently without the polar filaments described for the genotype. Owing to the absence of a full description of the genotype of Spinitectiis, the sys- tematic position of this genus is somewhat doubtful. If the present species is correctly assigned to Spiuitectus, the detailed examination of it which it has been possible to make leaves little doubt that the genus belongs to the sub-family Thelaziinae, in an appendix to which it was placed by Baylis and Daubney (1926). Family CUCULLANIDAE Cucullanus fraseri, sp. n. (Figs. ID and 11) This species occurred in the rectum of Chaenocephalus acerafus (four collections, including types) off South Georgia (Stations 45, 154, MS 68 and Gryt- viken), and of Trematomiis hansom (one collection, off South Georgia, Station 154). The male (of which there is only a single specimen) is 5 mm. in length and 0-29 mm. in maximum thickness. Mature females are 6-7 mm. long and about 0-4 mm. thick. The cuti- cular striations are at intervals of about 0-0025 nim. The opening of the mouth is slightly tilted dorsally. The cuticle of the cervical region is relatively very thick. There is a pair of prominent cervical papillae at 0-33 mm. in the male, and about 0-4 mm. in the female, from the anterior end. The expanded anterior portion of the oesophagus contains paired, latero-ventral thickenings within its muscular walls. At about the level of the cervical papillae the oesophagus becomes very narrow, and at a point a little behind them (o-4-o-45 mm. from the anterior extremity) is surrounded by the nerve-ring. Behind this point the oesophag
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