1921.] Fauna of the Chilka Lake : Polychaeta. 567 



The Sunderbans. In a pool of brackish water inside the protection em- 

 bankment of a clearing high up the Munda River. Vide p. 602. 



Port Canning. The variation in the salinity of the ponds at Port Canning 

 is very great, ranging from 0/82 to 22 - 88 parts per thousand of saline 

 residue. ■ 



The following species were collected in the Gangetic Delta : — 

 Lycastis indica, sp. nov. Beliaghatta Canal ; Garia. 

 Nereis glandicincta, sp nov. Barantolla ; Garia ; Dhappa. 

 Dendronereis aestuarina, sp. nov. Sunderbans. 

 Dendronereides heteropoda, gen. et sp. nov. Barantolla. 

 Polydora (Carazzia) kempi, sp. nov. Chingrighatta Canal. 

 Barantolla sculpta, gen. et sp. nov. Barantolla. 

 Mastobranchus indiens, sp. nov. Barantolla. 

 Potamilla leptochaeta, sp. nov. Port Canning. 



In addition, Matla bengalensis Stephenson, and Spio bengalensis Willey, have 

 been recorded from Port Canning. 



2. The Cochin Backwater. 



Collections were made in the Cochin Backwater near Ernakulam, on the south- 

 west coast of the Madras Presidency. These backwaters are part of a system con- 

 nected both with the sea and with large freshwater lakes. The salinity is probably 

 very variable, according to the season of the year, but precise information is not 

 available. 



The following species occur here : — 



Lycastis indica, sp. nov. Glycera alba, Rathke, var. cochinensis, 



Nephthys oligobranchia, sp. var. nov. 



nov. Ficopomatus macrodon, gen. et sp. nov. 



3. The Chiuca Lake. 



The following species were obtained here : — 



Ancistrosyllis constricta, sp. nov. Ltimbri coner eis simplex, sp. nov. 



Tylonereis fauveli, sp. nov. Glycinde oligodon, sp. nov. 



Nereis chilkaensis, sp. nov. Scoloplos niarsupialis, sp. nov. 



Nereis reducta, sp. nov. Polydora hornelli, Willey. 



Perinereis marjorii, sp. nov. Myriochele picta, sp. nov. 



Nephthys polybranchia, sp. nov. Heteromastus similis, sp. nov. 



Nephthys oligobranchia, sp. nov. Euclymene annandalei, sp. nov. 



Diopatra variabilis, sp. nov. Sterna spis costata, Marenzeller. 



Marphysa gravelyi, sp. nov. Laonome indica, sp. nov. 



Lumbriconereis polydesma, sp. Fabricia spongicola, sp. nov. 

 nov. 

 No species is common to the three districts. Lycastis indica was found in the 



Gangetic Delta and the Cochin Backwater, whilst Nephthys oligobranchia was found 



