Abstract
1. A new species of the Ascothoracican genus, Bacca-laureus is described. It is distinguished by the possession of lateral processes which contain branches of the gut and of the gonads. 2. The orientation of the segmented body within the mantle is described, and a detailed description of the segmented body is given. 3. A description of the structure and method of attachment of the mantle is given, and of the structure of the lateral coils. 4. The nauplius larva, found within the lumen of the coils, is described. There is a possible further larval stage in some of the larger parasites. 5. The systematic position of the parasite, and the general relationships of the genus Baccalaureus are discussed.

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