Terrestrial nematodes from Jan Mayen Author Allgén, C. A. text Annals and Magazine of Natural History 1953 12 6 665 688 journal article 10.1080/00222935308654469 10811051 Alaimus primitivus de Man. de Man, 1884 , p. 30, pl. l, fig. 1. D i m ensions.-Body-length:1. 0 mm., max. width = - 0.023 mm., oesophagus = 0.265 mm ., α. =43. 48, ß =3. 77. * * a, ß, and y are the well-known ratios by de Man. a: body-length: max. width, ß: body-length: length of the (esophagus and y: bodylength: length of the tail. V: the distance of the female sex opening (vulva) from the anterior end of the body in percentage of its total length. . samples the among species of n 0 Distributi — -. I TABLE F a F a F a TABLE II.--Geographical distribution of all known arctic nematoda. Unfortunately the position of the anus and the vulva could not be exactly determined. The female organs are short, with reflexed ovary.