182 
Neorhynchus longirostris n. sp. 
Body rather robust, posterior end slightly flexed ventrad. Proboscis 
making an angle with anterior end of body, inclined toward the ventral. 
Females average 6,2 mm. long, average maximum breadth 0,63 mm. 
Males average length 4 mm., average maximum breadth 0,47 mm. 
Proboscis cylindrical, average length 0,50 mm., average diameter 
Xv 
Figure 2. N. longirostris n. sp. Proboscis 
(x. 145), embryos (X 465). Camera lucida 
drawing. 
0,150 mm. Hooks rather irregu- 
larly arranged in about twenty cir- 
cular rows of six to ten hooks each, 
largest hooks at tip, 0,054 mm., 
length in succeeding rows dimi- 
nishing gradually to within a few 
rows of base of proboscis, then a 
distinct change in size of hooks 
occurs, basal hooks 0,016 mm. 
long. Embryos 0,027 mm. long by 
0,008—0,010 mm. broad, oval. 
The rather robust body of 
this species is distinctly different 
from the body form described for 
N. gracilisentis. Instead of taper- 
ing gradually toward either end, 
thus becoming spindle shaped in 
form, the body of this species 
maintains afairly uniform diameter 
until within a very short distance 
from the posterior end and then 
narrows down to a rounded termi- 
nation. A similar condition holds 
for the anterior end of the body. 
The uniform diameter is retained 
up toa short distance back of the 
base of the proboscis and then a 
gradual decrease in diameter 
brings the body width down to 
that of the proboscis. In the gravid 
females the middle third of the body becomes somewhat distended by the 
accumulation of egg-masses and embryos. 
From a mere cursory glance at specimens of this species one might 
be inclined to refuse them admission into the genus Neorhynchus. The 
reason for this lies in the unique form of the proboscis, and the number 
and arrangement of the hooks upon it. The short, bulbous proboscis 
