Indian Deep-Sea Mollusca. A specimen of Xenophora pallidula, from the Andaman Sea, 185 fathoms.... Among the dead shells used as a fortification are--(a) Pleurotoma congener, (b) Pleurotoma travancorica, (c) Pleurotoma carinata, and (d) Drillia captiva. The dead shells utilised as biulding-material are not stuck on indiscriminately, but are arranged along the edge of each whorl
