566 Memoirs of the Indian Museum. [Vol. V, 



Tylonereis fauveli, sp. nov. Chilka Lake. 

 Nereis (Nereis) chilkaënsis, sp. nov. Chilka Lake. 

 Nereis (N.) glandicincta , sp. nov. Gangetic Delta. 

 Nereis (N.) reducta, sp. nov. Chilka Lake. 

 Perinereis marjorii, sp. nov. Chilka Lake. 

 Dendronereis aestuarina, sp. nov. Gangetic Delta. 

 Dendronereides heteropoda, gen. et sp. nov. Gangetic Delta. 

 Nephthys polybr anchia , sp. nov. Chilka Lake. 



Nephthys oligobranchia, sp. nov. Cochin Backwater ; Chilka Lake. 

 Diopatra variabilis, sp. nov. Chilka Lake. 

 Marphysa gravelyi, sp. nov. Chilka Lake. 

 Lumbriconereis polydesma, sp. nov. Chilka Lake. 

 . Lumbriconereis simplex, sp. nov. Chilka Lake. 



Glycera alba, Rathke, var. cochinensis, var. nov. Cochin Backwater. 

 Glycinde oligodon, sp. nov. Chilka Lake. 

 Scoloplos marsupialis, sp. nov. Chilka Lake. 

 Polydora hornelli, Willey. Chilka Lake. 

 Polydora (Carazzia) kempi, sp. nov. Gangetic Delta. 

 Myriochele picta, sp. nov. Chilka Lake. 

 Heteromastus similis, sp. nov. Chilka Lake. 

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

 Mastobranchus indicus, sp. nov. Gangetic Delta. 

 Euclymene annandalei, sp. nov. Chilka Lake. 

 Sternaspis costata, Marenzeller. Chilka Lake. 

 Potamilla leptochaeta, sp. nov. Gangetic Delta. 

 Laonome indica, sp. nov. Chilka Lake. 

 Fabricia (Manayunkia) spongicola, sp. nov. Chilka Lake. 

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



The species represented in the collection fall naturally into three geographical 

 groups, viz. (1) those living in the Gangetic Delta and in the neighbourhood of Cal- 

 cutta, (2) those collected in the Cochin Backwater, near Ernakulam, on the south- 

 west coast of the Madras Presidency, and (3) those collected in the Chilka Lake. 



r. The Gangetic Deeta. 



Specimens were collected at the following localities : — 

 Barantolla. In brackish pools and salt lakes. 

 Chingrighatta. In a canal of slightly brackish water. 

 Durgapur. In a canal of slightly brackish water. 

 Beliaghatta Canal. Water slightly brackish. 

 G aria. Pools of slightly brackish water. 

 Dhappa. Salt lake and adjacent ditches of brackish water. 



All these places are within 10 miles of Calcutta. The salinity of the water is 

 very variable, but never high, probably never exceeding sp. gr. 1-015 at I 5°C 



