538 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
The following details were taken from specimens belonging to lot 
No. 5, collected August 18, 3887: 
One of the largest females afforded in alcohol thefollowing measure- 
ments : Length of body, 18 mm ; neck, 5 nim ; proboscis, l mm ; entire length, 
25 mm ; diameter of body, anterior, 2 mm ; diameter of neck, 0.34 mm ; 
diameter of bulla, 1.6 ram ; diameter of inner core of neck, modified pro- 
boscis sheath, 0.2 mai ; length of ovum, 0.08 mm ; breadth, 0.011* im . 
A few males were observed, each with bursa everted, and with the 
slender neck expanding at the apex into an elliptical head filled with 
granular material (fig. 88). The length of these males was about 6 lura . 
Other males were found which had the normal shape of the species; 
body straight, long-fusiform ; neck slender, cylindrical, expanding into 
a thin- walled bulla immediately behind the proboscis. 
The length of one of the males was 16 mm ; testes 0.6 to 0.7 mm in length, 
0.26 mm in width. 
The proboscis in this species is, when fully everted, somewhat fusi- 
form, cylindrical at base, swollen in front of middle. A typical proboscis 
had the following dimensions: Length, l mm ; diameter at base, 0.27 min ; 
diameter in front of middle point, 0.33 mm ; diameter at apex, 0.13 mm . 
The hooks on the swollen part of the proboscis and towards the apex 
are stout, with a long bifid basal support. Behind the swollen part 
the hooks are more slender, conical, arcuate, with short bifid base. 
A young male Echinorhynchus, which I take to be P. proteus, was 
found in the peritoneum of Paralichthys dentatus , Wood’s Holl, Septem- 
ber 2, 1887. 
The proboscis was partially inverted. The hooks near the base, 
slender, slightly recurved, with bifid basal supports; those near the apex, 
broader, more abruptly recurved, basal supports also bifid. Proboscis 
sheath, long, slender, linear, rounded and slightly swollen posteriorly,' 
enlarging slightly a short distance from anterior end. Lemnisci short, 
inserted near the base of the proboscis sheath. Anterior part of the 
body constricted, somewhat inflated near the proboscis, but not globular 
as in adult. 
Length, 6.25 mra ; length of proboscis, about 0.74 mm , 0.46 mm of which 
is inverted; length of sheath, 2.6 mm ; length of testis, 0.3 mm . 
The elongated proboscis sheath of this young specimen suggests the 
anterior part of the adult, which, after it is imbedded in the tissues of 
the host, becomes reduced to a filiform neck in which the sheath forms 
a central core. 
The plates here numbered I to VIII follow page 542 and are there 
numbered LIII to LX. 
