INDIAN DEEP-SEA MOLLUSCA. 



Fig. 70. — Rostellaria delicatula, very common in the Bay of Bengal 

 near the loo-fathom line, and one of the most characteristic deep-sea 

 Mollusca of India. 



Fig. 71. — A specimen of Xenophora pallidtda, from the Andaman 

 Sea, 185 fathoms ; reduced. Among the dead shells used as a fortification 

 are — (a) Pleurotoma congener, {U) Pleiirotoma travancorica, (r) Pleuro- 

 toma carmata, and (d') Drillia captiva. The dead shells utilised as 

 building-material are not stuck on indiscriminately, but are arranged 

 along the edge of each whorl. 



\^To face page 278. 



