and the end vesicle opening by the proboscis pore is lacking. 
one side and sometimes on 
THE ENTEROPNEUSTA. 
the other. 
TABLE 2. 
Pt, flava, var. laccadivensis. 

647 
Sometimes this occurs on 

(2) 



No. of specimen (1) (Regenerated) (3) (4) 
Proboscis CoelOM!..< 22... .ccce.-n eee Fairly large as (1) Large Spacious 
Collsricoclomies...5.c..2c0e-ce-s-eeee Spacious Small but as (1) as (1) 
well defined 
Ventral proboscis septum ......... To tip of — as (1) as (1) 
stomochord 
Dorso-ventral proboscis muscles Absent _ Traces Present 
Dorsal collar septum ............... Complete | (Regenera- as (1) as (1) 
after 1st ting) 
root 
Ventral collar septum ............ Absent Complete at as (1) as (2) 
hind end of 
collar 
Racemose OrgaM ........+..0..0ee0e- Large and | Small and_ | Well marked | Well marked. 
lobulated | unlobulated | and slightly | Unlobulated 
lobulated 
Dorsal proboscis muscle decus- | Strong with | Feeble. No | Distinet. A | Distinct but 
sation 
Dorsal roots 
Proboscis pores 
Nerve cord 
Bee e eee were nen ee eeneennee 
Length of post-branchial groove 
Length of branchial region 

Length of cornua x 100 
Length of collar 

Circumference of branchial ces. 
ventral circu- 
lar muscles 
*RRRRRR 
*1R 
Lumen 
continuous 
bo 
i) 
1 

Circumference of cesoph, ces. 
Synapticula 


ventral circu- 
lar muscles 
Collar cord 
in contact 
with 
epidermis 
throughout 
LR 
Middle of 
cord solid 

few ventral 
circular 
muscles 
RRRr 
LR 
Lumen 
continuous 


no ventral 
circular 
muscles 
Rrrr 
LR 
Lumen 
continuous 

as (4) 
After Ist 
root. In- 
complete in 
places 
as (1) 
as (1) 
Strong with 
a few ventral 
circular 
fibres 
RRr 
Lr 
Lumen with 
strong ten- 
dency to 
obliteration 
22°5 


* See foot-note on p. 645. 

as (2) 
as (4) 
Well marked. 
No ventral 
circular 
muscles 
RRR 
IR 
Lumen 
continuous 
on 
cr 
83—2 

