. Bulletin of the British Museum (Natural History). CESTODE PARASITES OF R. BATIS AND S. ACANTHIAS 167 anteriorly to the cirrus-pouch, turning in mid-segment to run back to the ootype, situated behind the central portion of the ovary. The two unequal lobes of the ovary are connected midway along their length by a long isthmus, giving the organ an 'H'-shaped appearance, with the posterior arms of the 'H' turning inwards to the middle of the segment (Fig. 3a). It is contained in the area within the longitudinal excretory vessels, and occupies the whole of the depth of the field between the longi
. Bulletin of the British Museum (Natural History). CESTODE PARASITES OF R. BATIS AND S. ACANTHIAS 167 anteriorly to the cirrus-pouch, turning in mid-segment to run back to the ootype, situated behind the central portion of the ovary. The two unequal lobes of the ovary are connected midway along their length by a long isthmus, giving the organ an 'H'-shaped appearance, with the posterior arms of the 'H' turning inwards to the middle of the segment (Fig. 3a). It is contained in the area within the longitudinal excretory vessels, and occupies the whole of the depth of the field between the longitudinal musculature, except for the connecting isthmus, which spans the ventral field of the segment. The vitellaria are disposed in two continuous longitudinal rows laterally to the excretory canals, being broken only by the genital ducts on the poral side. The uterus initially has many small lobes, which grow until they occupy the whole of the segment. The rounded eggs measure o-oi8-o-022 mm and contain embryos measuring o-oi-o-oi4 mm in diameter. These specimens are very similar in many respects, especially in the shape and size of the hooks and the number of testes, to A. septentrionale Baer & Euzet, 1962. This species was erected to represent A. coronatuni (Rud., 1819) of Johnstone, 1906, from R. clavata and R. bails; A. ijimai Yoshida, 1917, of Southwell, 1925, from Raja spp.; and^. coronatuni (Rud., 1819) of Linton, 1925 (proparte). However, according to their respective authors, all these worms have three accessory suckers in front of. 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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Keywords: ., 1973, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
