EXPLANATION OF PLATE XV. 



Photographs of shells of Modiola from brackish water on the coast of India. 



Modiola undulata (Dunker). 



Figs. 1-4. — Variously coloured specimens from a single handful of weed from the 



outer channel of the Chilka Lake (September, 1914). 

 Fig. 5. — Type of M. chilkaënsis , Preston, from algae growing on stones at Breakfast 

 I., Chilka Lake. 

 ,, 6. — Type of M. undulata var. crassicostata, Preston, from weeds growing on 

 bottom off Samal I., Chilka Lake. 



Modiola striatula, Hanley. 



Fig. 7. — Type of M. jenkinsi, Preston, from oyster-shell from Manikpatna, Chilka 

 Lake. 

 ,, 8. — Specimen from the Chilka Lake identified by Blanford as M. striatula var. 



(identification confirmed by Preston). 

 ,, 9. — Type of M. cöchinensis, Preston, from oyster-shell from Cochin backwaters, 



near Ernakulam. 

 ,, 10. — Specimen from the Chilka Lake identified by Blanford as M. emarginata, 



Benson. 

 ,, 11. — Type of M. annandalei, Preston, from stone from Chilka Lake near 



Rambha. 

 ,, 12.— Type of M. celator, Preston, from worm-eaten driftwood from the beach at 

 Puri, Coast of Orissa. 

 Figs. 13-15. — Three specimens from a worm-eaten log, probably from the Gangetic 

 delta. 

 ,, 16-18. — Abnormal specimens from Port Canning, Gangetic delta, identified by 

 Nevill as " M. striatula, Hanley (= M. emarginata, Benson)." 



Specimens i — 4 were photographed in spirit ; the other figures are from dried shells. The line 

 below each figure shows the actual length of the shell. 



