654 
Pt. flava, var. muscula. 
R. C. PUNNETT. 
TABLE 


No. of specimen 
(1) 



IBrobOScis|COClOM sees. -caceeceseesete 
Collar coelom 
Dorso-ventral proboscis muscles 
Dorsal collar septum 
sede eeeweees 
Ventral collar septum 
Racemose organ 
Dorsal proboscis muscle decus- 
sation 
Dorsal roots 
Proboscis pores 
Nerve cord 
Length of post-branchial groove 
Length of branchial region 

Length of cornua x 100 
Length of collar 
Circumference of branchial ces. 
Circumference of cesoph. ces. 
Synapticula 
Length of branchial region 
Length of collar 


Very small 
Spacious 
Not nearly 
to tip of 
stomochord 
Absent 
After 1st 
root. Not 
complete 
Traces 
Very small 
Strong with 
ventral cir- 
cular fibres 
*RRR 
*Lr 
Lumen with 
tendency to 
obliteration 
14:0 
| (2) 
| Small 
Fairly large 
as (1) 
as (1) 
After 1st 
root complete 
Absent 
Well marked. 
Slightly 
lobulated 
as (1) 
RRrr 
LR 
as (1) 
14°5 
15°8 
1:30 


5. 
Pt. flava, var. cooperi. 
(1) 
Spacious 
Very 
spacious 
Not nearly 
to tip of 
stomochord 
Absent 
Complete 
after 1st root 
Absent 
Well marked. 
Unlobulated 
Feeble. No 
ventral cir- 
cular muscles 
IR 
Lumen with 
tendency to 
obliteration 
“12 
119 
Not more 
than 8 
2°23 



Pt. viridis. 


(2) (1) (2) 
Small Very small Small 
as (1) Small Very small 
as (1) | Not nearly | Not quite 
to tip of to tip of 
stomochord | stomochord 
as (1) Absent as (1) 
as (1) Complete After Ist 
after Ist root| root but not 
at once 
complete 
Traces in || Complete at Traces 
extreme hind|/extreme hind 
end of collar || end of collar 
as (1) Large. Large and 
Unlobulated | _ slightly 
lobulated 
Moderately 2 Strong with 
developed. a few ventral 
No ventral fibres 
circular 
muscles 
Rr RRr 2 
R 2 LR 
as (1) Lumen as (1) 
completely 
obliterated 
Very short 
‘15 and insigni- as (1) 
ficant 
53°7 161 27°8 
1:13 1:02 95 
Not more = = 
than 7 
2°06 “85 1:44 





* See foot-note on p. 645. 

