iQiQ-l ^- H. Gravely : Fauna of Chandipore. 397 



AcUnians are sometimes found attached to shells inhabited by 

 hermit crabs. One species attaches itself to Chaetopterid 

 tubes below the surface of the ground, rising up to spread 

 its tentacles at the surface. The largest form ( ? Cerianthus 

 sp.), common every year, except 1919 when none were 

 . found, lives with its elongate column deeply embedded in 

 the sand, and its tentacles expanded, usually at the bottom 

 of a slight depression in the ground. 



POLYCHAETA. 



Syllidae. Small worms, some of them strobilizing, found 

 among Obelia on Chaetopterid tubes. 



Polynoidae. Sometimes found in large shells inhabited by 

 hermit crabs. 



Spionidac. Small worms living among debris at base of Obelia 

 on Chaetopterid tubes. 



Chaetopteridae ( ? n. gen,). A small Chaetopterid with a single 

 pair of tentacles, 7 short chaetigerous segments (including 

 the specialized fourth segment), 2 longer ones, 2 very long 

 ones and then a number of short ones, forms slender and 

 strongly anulated hyaline tubes (diameter abo^t i mm.) in 

 the sand near low- tide mark. About 60 mm. of the tube 

 project above the ground and are often covered with 

 hydroids on which small nudibranchs feed and among which 

 small SylHds and Spionids live. Actinians sometimes 

 attach themselves to these tubes below the surface of the 

 ground, stretching up to spread their tentacles in the water. 



Other worm tubes, including tubes of Pectinaria washed up by 

 the tide, are common. 



MOLIvUSCA. 



Nassa. A large species is the commonest gastropod between 

 tide-marks. Its shell is often covered with Clavactinia gal- 

 lensis which is found on living individuals as well as on 

 shells inhabited by hermit crabs. 



Nudibranchs, probably minute iVeoHds, were found eating and 

 laying eggs among hydroids on Chaetopterid tubes. A 

 larger nudibranch without cerata was washed up by the 

 tide in considerable numbers in 1916. 



Lamellibranch shells washed up by the tide are both varied 

 and numerous. Meretrix meretrix is sometimes found alive 

 on the surface of the ground between tide-marks. 



ECHINODERMATA . 



Small Kchinoid shells are sometimes washed up by the tide, 

 and were specially abundant in 1919, when a few living 

 specimens were found between tide-marks. Their tube-feet 

 were very small, and appeared to be useless for walking, 

 this function having been taken over b}' the somewhat long 

 purplish spines. 



