Discovery reports (1956) Discovery reports discoveryreports27inst Year: 1956 60 DISCOVERY REPORTS supplied by Kramp, I am satisfied that these ridges are present, though not well marked. In all three species the place of attachment to the muscular lamella is deeply sunk, as Kramp says, in a narrow longitudinal furrow. The lateral radial canals follow a straight course to the ring canal. There is a ventral, medianly cleft mouth-plate. Whilst in 'S.' orthocanna, and in its antarctic counterpart men- tioned on p. 59, the proximal side of the nectosac, bearing the junction of the canals, is free
Discovery reports (1956) Discovery reports discoveryreports27inst Year: 1956 60 DISCOVERY REPORTS supplied by Kramp, I am satisfied that these ridges are present, though not well marked. In all three species the place of attachment to the muscular lamella is deeply sunk, as Kramp says, in a narrow longitudinal furrow. The lateral radial canals follow a straight course to the ring canal. There is a ventral, medianly cleft mouth-plate. Whilst in 'S.' orthocanna, and in its antarctic counterpart men- tioned on p. 59, the proximal side of the nectosac, bearing the junction of the canals, is free of muscular tissue, in it is not so, nor is the wall of the nectosac of Marrus orthocannoides sunken in as it is in those two species. Cbr
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