alb.gl. Albumen gland b.c. Buccal cavity c. Crop f.ov. Free oviduct h.d. Hermaphrodite duct h.gl. Hermaphrodite gland int. Intestine m. Muscle œ. Œsophagus ov. Oviduct p. Penis pr. Prostate r.d. Re...
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Walter E. Collinge (1897) studied this question.