EXPLORATION OF ALASKA. 215 
in the previously examined form, the largest (in the largest specimen ) 
reaching the height and the diameter of about 1.5 mm., those in the 
neighborhood of the gill somewhat larger. 
Two smaller individuals were dissected, the larger being harder than 
these and not so suitable for that purpose. The peritoneum was 
colorless. 
The central nervous system just as in the former specimens, but the 
buccal ganglia smaller than the olfactory, and the gastro-cesophageal 
short-stalked. 
The eyes as above. The otocysts, under the glass, very distinct as 
chalk-white points on the hinder and outermost part of the cerebral 
ganglia. The leaves of the rhinophoria without spicula. The skin 
and the papille of the back as above or still more crowded with very 
hard spicula. 
The oral tube large, (in both individuals) about 2.5 mm. long. The 
bulbus pharyngeus of the usual form, (in both individuals) about 3.0 
long, by a breadth of 1.8 mm, and the height nearly the same; the 
sheath of the radula projecting straight backwards 2.0 mm. The 
buccal crop, lying to the left side of the bulbus, somewhat compressed, 
of about 3.0 mnf® largest diameter, the stalk nearly half as long as 
the largest diameter of the crop. The tongue with ten rows of teeth, 
further backwards also eleven or twelve developed and three younger 
rows, the total number thus being twenty-four or twenty-five. They 
were entirely as in the form first examined. 
The salivary glands, the pyloric part of the intestine, with its biliary 
sac, and the liver as usual. The sanguineous gland whitish, much 
flattened, covering the whole upperside of the bulbus pharyngeus and 
the central nervous system; a flattened cavity in its interior. The 
hermaphroditic gland, through its more reddish color, contrasting with 
the grayish color of the liver. 
The anterior genital mass 11.0 to 12.0 mm. long, by a height reach- 
ing 7.0 to 8.0 mm., and a breadth of 4.0 to 4.5 mm. The ampulla of 
the hermaphroditic duct lying transversely on the lowest and most 
anterior part of the back of the mucous gland, rather straight or 
forming nearly a circle, about 5.0 to 7.0 mm. long, whitish. The 
spermatoduct making many coils on and before the anterior part of 
the mucous gland; the first part about 35.0 to 45.0 mm. long, the 
second nearly 25.0 mm. long; the penis about 1.5 to 2.0 mm., pro- 
jecting freely from the vestibulum, conical; the glans seemed rather 
short. The spermatotheca of about 3.0 mm. diameter, whitish. The 
