ENTOZOA OF MARINE FISHES. 
533 
EcHINORIIYNCHUS INCRAS8ATU8 Molili. 
[Plate vi, figs. 54 to 69a. | 
Molin, Sitzungsber. cl. k. Akad. xxxm, page 294; Denksclir. d. k. Akad. xix, x 
pages 260-262, tab. vm, fig. 1. 
Some immature specimens, t\Vo from the peritoneum of the angler 
[Lophius piscatorius), several from the peritoneum of the common floun- 
tier ( Paralichthys dentatus ), and one from the peritoneum of the bluefish 
( Pomatomus saltatrix ), appear to be the young of this species. 
The specimens from Lophius are broadly fusiform. The proboscis is 
stout, thickened near the base, from which point it tapers gradually 
towards the apex and abruptly towards the base. The hooks near the 
base are slender, falcate, pointed ; near the middle becoming abruptly 
much larger, broader, and thicker, more strongly recurved and provided 
with elongated basal supports, as long or even longer than the hooks 
themselves ; towards the apex the hooks are like the median hooks in 
shape but not quite so large. There are about ten spiral series of 
hooks, the five basal series small, the remainder large. About seven 
hooks can be seen on a side in a single spiral. Sheath two and a half 
times length of proboscis. Neck conical, smooth. Body behind neck 
inflated, when compressed somewhat rhomboidal, for a distance which 
is a little greater than the length of the sheath. In one of the speci- 
mens this part of the body was thickly covered with small spines. In 
the other specimens the spines were absent, evidently because the epi- 
dermis which bears them had been stripped off. Behind the inflated 
portion the body is cylindrical. The cylindrical part is somewhat less 
than one-half the entire length of the specimen, and its rounded ex- 
tremity is armed with very small sagittate spines. 
One of the specimens was evidently a young male. In the posterior, 
cylindrical part of the body, one of the testes has made its appearance 
a short distance back of the sheath, and what appears to be the other 
near the posterior end of the body. These rudimentary genitalia lie 
surrounded by large undifferentiated nucleated cells, inclosed in a sus- 
pensory ligament, which is attached to the base of the proboscis sheath. 
Two large masses of nucleated cells were observed lying one on each 
side of the sheath and occupying the place of lemnisci. These nucleated 
cells range from 0.02 mm to 0.06 ram in diameter. In one of the specimens 
the proboscis was partly inverted; the posterior end was also partly 
inverted; the genitalia in this specimen were rudimentary and appeared 
to be those of a female. ’ 
A small Echinorhyuclius was found in the peritoneum of a bluefish, 
which I have likewise referred to this species. The proboscis was iu- 
vaginated, but the outline of the hooks was distinct. There were about 
five series of relatively small, slender hooks at the base of the proboscis, 
with variously forking basal supports. (Figs. 69 and 69a.) These were 
followed immediately by very large median hooks, becoming a little 
