. Bulletin of the Natural History Museum Zoology. . 3c Fig. 3a-c Strobila of Nybelinia southwelli sp. nov. a. acraspedote arrangement of the proglottids with characteristic convex margins, b. mature proglottid with the large cirrus sac and oviform testes, c. gravid proglottid. Scale bar b=100 urn and scale bar c=l 10 urn. more slender and slightly curved; L=, B=8-9. The basal armature is heteromorphous (Fig. 5b). The basal hooks are of the same shape and size as those in the metabasal region of the tentacle. External surface hooks, L=, B=—; internal hooks, L=, B=8
. Bulletin of the Natural History Museum Zoology. . 3c Fig. 3a-c Strobila of Nybelinia southwelli sp. nov. a. acraspedote arrangement of the proglottids with characteristic convex margins, b. mature proglottid with the large cirrus sac and oviform testes, c. gravid proglottid. Scale bar b=100 urn and scale bar c=l 10 urn. more slender and slightly curved; L=, B=8-9. The basal armature is heteromorphous (Fig. 5b). The basal hooks are of the same shape and size as those in the metabasal region of the tentacle. External surface hooks, L=, B=—; internal hooks, L=, B=8-9. The morphology of the mature proglottid of N. perideraeus (VNHM 2109) is given as Fig. 6. N. perideraeus has a long acraspedote strobila of about 300 proglottids (strobila on 2 slides). While the anterior proglottids are wider than long (520-560 x 266- 300), the final proglottids are longer than wide (559-741 x 520-530), and continuously increasing in size. The genital atrium is ventrosubmarginal in about the anterior third of the proglottids and alternates irregularly. The cirrus sac is elongate (254 x 60), directed anteromedially from the genital atrium and the sac is thin-walled. The cirrus is unarmed, coiled within the sac and an internal seminal vesicle was not seen; external seminal vesicle absent. Testes ar- ranged in double layer, number 86-97, ovoid, 33-49 in diameter, encircle the female genital complex, and some testes are present anterior to the cirrus sac. Other details of the female genital complex not seen. Remarks. In the original description of Tetrarhynchus perideraeus, Shipley & Hornell (1906) described long worms with a slender scolex bearing long bulbs as well as slender tentacles. The tentacles as well as the tentacular sheaths are short and the tentacular armature consists of oblique rows of very minute hooks of uniform size. However, these characters do not adequately define the species. Dollfus (1930) remarked that without examination of the o
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