. Bulletin of the British Museum (Natural History). 172 B. R. MANGER The scolex, bothridia, and hooks, together with the overall size, are the few morphological characters available in this young worm. The bothridia measure 0-39 mm to 0-4 mm in length, and the hooks are from o-io8 to o-i2 mm long. The handle measures o-046-0'056 mm, the inner blade o-072-o-074 mm and the outer blade o-074-o-o8 mm. There is some speculation as to the stage in development at which the hooks of Acanihobothrium and allied genera stop growing, and for this reason the above specimen has not been allotted to a new, o
. Bulletin of the British Museum (Natural History). 172 B. R. MANGER The scolex, bothridia, and hooks, together with the overall size, are the few morphological characters available in this young worm. The bothridia measure 0-39 mm to 0-4 mm in length, and the hooks are from o-io8 to o-i2 mm long. The handle measures o-046-0'056 mm, the inner blade o-072-o-074 mm and the outer blade o-074-o-o8 mm. There is some speculation as to the stage in development at which the hooks of Acanihobothrium and allied genera stop growing, and for this reason the above specimen has not been allotted to a new, or previously-described species. Echeneibothrium minutum Williams, 1966 (figs 7 and 8a) Many complete worms, together with several fragments, were found in four Raja batis caught in Faxa Bay on 22 and 23 October 1966. The worms are slightly larger than the specimens described by Williams, measuring between 1-29 mm and 375 mm in length (one specimen, however, reaches 5-48 mm) as opposed to 2 mm for Williams' material. There is a corresponding increase in the number of segments (up to thirty instead of ten), the myzorhynchus is fractionally larger, and the spine-covered, muscular bothridia may be a good deal longer. In the original description of E. minutum the bothridia are quoted as being 0-27 mm long, but are figured at about 0-5 mm. In the present material the bothridia are usually between 0-5 and 0-7 mm in length, but can reach a size of 0-9 mm, varying in shape and size quite considerably. Fig. 7. Echeneibothrium Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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