. Text-fig. 36. Cnemidocarpa nordenskjoldi (Michaelsen) and C. drygalskii (Hartmeyer): A, B, comparison of the intestinal loop, ventral view; C, gonad of C. nordenskjoldi (St. WS 805); D, transverse section of the same. Gonads. One elongate cylindrical gonad on each side, bent into the shape of the letter U, and made up of both ovary and testis. Atrial tentacles. The atrial tentacles are thickly scattered over the narrow velum.' Arnback evidently regarded the gonads and the atrial tentacles as the best characters for separating Ypsilocarpa from Cnemidocarpa, but as mentioned above found the st
. Text-fig. 36. Cnemidocarpa nordenskjoldi (Michaelsen) and C. drygalskii (Hartmeyer): A, B, comparison of the intestinal loop, ventral view; C, gonad of C. nordenskjoldi (St. WS 805); D, transverse section of the same. Gonads. One elongate cylindrical gonad on each side, bent into the shape of the letter U, and made up of both ovary and testis. Atrial tentacles. The atrial tentacles are thickly scattered over the narrow velum.' Arnback evidently regarded the gonads and the atrial tentacles as the best characters for separating Ypsilocarpa from Cnemidocarpa, but as mentioned above found the structure of the gonad basically similar. There remains only the number of the gonads, their considerable length, and their shape, together with the distribution of the atrial tentacles, to distinguish the two genera, but I do not consider that these characters, even in combination, are of generic value. The proper genus for nordenskjoldi is therefore thought to be Cnemidocarpa.
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