200 Memoirs of the Indian Musturn. [Vol. VIT, 



Genus S t y 1 a r i a . 

 Stylaria lacustris (L.). 



Open pool in the reed-beds of the Hamun-i-Helmand, a few miles east of Lab-i-Baring, Seis- 

 tan. Water very slightly brackish, fairly clear, about five feet deep ; bottom muddy with a 

 luxuriant growth of Potamogeton pectinalus. 8-xii-1918. N. Annandale and S. W. Kemp. Several 

 specimens. 



Fam. TUBIFICIDAE. 

 Genus Branchiura. 

 Branchiura sowerbyi, Bedd. 



Lucknow, Gaumati River. 15-iii-1919. G. S. Thapar. A single specimen. 



The specimen was of fair size, 50 mm. in length, and is interesting from the fact 

 that both penes are protruded. As I have previously noted (14), a penis was not 

 described or suspected to exist in this animal, until it was found in specimens from 

 the Inlé Lake. 



I have also received, taken on the same day and from the same source, a number 

 of specimens of a species of Branchiodrilus, the Naid worm with gills remarkably 

 like those of Branchiura, but on the anterior part of the body instead of the pos- 

 terior. The occurrence of the two together is a point of some interest. I much 

 regret not to be able to give the specific diagnosis of the Branchiodrilus, of which 

 three species are known, all Indian ; but the worms came to hand when the present 

 paper was already completed, and I fear it will be some time before I have the 

 opportunity of undertaking detailed investigations. 



Fam. MONILIGASTRIDAE. 



Genus Drawida. 



Drawida barwelli (Bedd.) var. impertusus, var. nov. 



Bombay, Victoria Gardens. 30-vi-1917. B. Prashad. Five specimens. 

 Bombay, under a tree near the Fort. 30-vi-1917. B. Prashad. Seven specimens. 

 Elephanta Island, Bombay; high up on a hill. 30-vi-1917. B. Prashad. Three specimens. 

 Elephanta Island, Bombay; in a rotten tree. 30-vi-1917. B. Prashad. A single specimen. 

 Elephanta Island, Bombay ; on the sea-shore. 30-vM917. B. Prashad. A single specimen, 

 immature. 



External Characters : — The length of fair-sized specimens is from 45 to 48 mm., 

 and their diameter 3*5 mm. The colour is a rather blotchy olive, darker on the 

 dorsal surface than ventrally, with a still darker mid-dorsal line ; the first few seg- 

 ments are pale. The number of segments in two specimens was 130 and 132, 



The prostomium is small, prolobous, and under cover of the first segment. 



Dorsal pores are absent. 



The setae are small and closely paired, and are visible as far forward as the 

 second segment. The interval aa is rather less than be (f or fee), or may be fully 

 equal to it towards the hinder end ; dd is about f of the circumference. 



The nephridiopores are in a single line, just below the level of the setae c. 



