The Annelida Polychaeta Volume 2

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... Locality. Gilbert Islands: off Apaiang. Surface. Surface temp. 84° F. 3 January, 1900. Numerous specimens taken at night by electric light. This species in lacking any distinct markings as well as in limited number of somites of the anterior division of the body presents resemblances to A. prolifer O. F. Muller, though numerous differences appear upon closer study. The palpi present uniformly a strongly marked difference in being conspicuously geniculate near the base, the organs distad of the angle extending directly ectad and presenting a very characteristic appearance. The tentacular cirri are less smooth, showing distinct evidence of numerous annuli. The minor tentacles are attached nearer the middle line. The median tentacles and the tentacular cirri are much longer. The number of somites bearing only composite setae is constantly six. The main division of the body wholly lacks pigment, instead of being yellowish. Atjtolytus Planipalpus, sp. nov.1 Plate 20, fig. 4; Plate 21, fig. 1, 2. Epitokous Male (Polybostrichus). The general color is yellow, excepting the blackish eyes and the anterior seminiferous division, which is brown. The cirri, tentacles, and palpi are nearly colorless, somewhat whitish. The body of the type consists of an anterior region of fourteen setigerous somites, in which the setae are all of the coarse composite type and all of which are crowded with masses of spermatozoa, and of a longer posterior region which contains no sexual products and which has long, simple, natatory setae in addition to the coarse composite ones. The posterior region is regenerated posteriorly, the more slender regenerated portion embracing twenty-four somites and the anterior portion thirty-six less crowded somites, making a total...