62 Mr. C. R. Narayan Rao on some 
they resemble closely except in size. In view of the absence 
of the dorsal pores, and consequently the complete shutting 
off of the segmental cavities from the outside world, it is 
only reasonable to associate in some sort of manner the 
uniform occurrence of the bubbles with the cell-aggregates 
of the secondary chambers. In other words, the ventral 
portion of the celomic cavity perhaps acts as a hydrostatic 
chamber, which in worms whose environment is susceptible 
of being frequently inundated by sudden floods must be 
extremely of a useful character. 
Glyphidrilus elegans, sp. n. 
External characters.—The largest specimens measure 
136 mm. ; number of segments 186-270; circumference of 
body about segments 9-14 35 mm. where the body is round; 
from segments 18-24 5 mm. across the body where it is 
flat ; between the inner borders of the clitellar wing 5°5 mm., 
here the body is thick and flat. Behind the body gradually 
narrows and is four-cornered, with the dorsal, ventral, and 
lateral canals. Sometimes the dorsal depression may extend 
forward up to segment 13; segments 7-13 are broad and 
those behind are extremely short, nearly half or less than 
half of the anterior ones. Segments in the posterior part 
of the body only gradually become short and can be counted 
up to the anus, which is dorsal and terminal. The anterior 
preclitellar segments have secondary annular ridges and 
grooves. 
Prostomium zygolobous. 
Dorsal pores absent. Nephridial pores from behind 
segment 12 in seta-space 6c. 
In segments 24-82 aa=2tab and=2ab both in front 
and behind this region, and gradually becoming less than 2a 
both ways ; aa@ is greater than be or dd; ab=cd. 
The clitellum is marked from segments 14-35, 48 
( =22-35). 
The genital markings are three, or only two rows of 
puberty-tubercles. The median, when present, commences 
from segments 12-18, and quite variable in number (7, 12), 
-and the laterals, which are uniform in their occurrence, 
begin on segment 13 extending up to segment 24. Behind 
the puberty-wing, the lateral series may be continued on 
segments 32-86 on one or both sides and the median ones 
on segments 41-42. Each of these tubercles, which in 
point of disposition and microscopical structure resembles 
the foregoing species, differs from them in a marked manner 
by their oval or transversely elongated shape. The secondary 
annular ridges from segments 18, 22 are very strongly 
