In Herdmania, digestive system includes the alimentary canal and digestive glands. Lying in the atrial cavity inside the mantle is a large bag-like pharynx or branchial sac. The wall of the pharyx is fused to the mantle along the anterior and ventral sides, on account of this attachment the atrial cavity is divided into right and left halves which are, [...]
There is an oval neural gland of brown colour lying immediately above the brain. It is embedded in the mantle in the intersiphonal region and is 4 × 1 mm in size. It has several branching tubules, which open in a non-ciliated canal running along the entire length of the gland. It leads into a short duct which opens by [...]
The animal is hermaphrodite or bisexual and protogynous, i.e., ovary matures first, thus, self-fertilisation is avoided. Gonads: There are two large gonads embedded in the mantle, the left one lies in the loop of the intestine and the right one dorsal to the heart. Each gonad is about 3 × 1 cm, and consists of 10 to 25 lobes lying [...]