EXPLORATION OF ALASKA. 265 
decreasing size (Pl. XV, fig. 6ed); the fourth lateral plate, on 
the tongue especially, with a small hook (fig. 7a) that is more 
developed backwards, and in the four youngest rows is developed 
quite (Pl. XIV, fig. 17) as in the three plates mentioned. On the 
lateral parts of the pleuree ten to eleven external (uncinal) plates, 
the four to five interior (fig. 7, 8ab, 10; 17bc) with a more devel- 
oped crest, the rest (fig. 7b) narrower. 
The salivary glands (Pl. XV, fig. 11a) nearly as long as the 
duct (fig. 116); both together about 5.5 mm. long, descending 
along the whole back side of the bulbus pharyngeus ; the gland 
whitish, smooth. 
The csophagus rather long (6.5 mm.), and wide especially 
in the posterior part (diameter 2.0 mm.), entering into the inferior 
part of the liver; with rather strong and numerous folds; the 
contents (as in the intestine) spongiary masses and different Ra- 
diolariz of a diameter of 0.09 mm. The intestine issuing from the 
liver a little before the middle of the upper side of this organ; 
the anteriorly proceeding part reaching the anterior margin of 
the liver and about 4.5 mm. long by a diameter of 1.5 mm.; the 
retrocessive part 7.0 mm. long by a diameter of 0.75 mm. The 
liver divided by a deep furrow from the right margin into two 
halves of nearly equal size; 6.0 mm. long by a breadth of 3.75 
and a height of 3.4 mm.; the posterior extremity rounded ; the 
anterior half of the inferior side obliquely flattened; the color 
yellowish-gray ; the cavity of the interior rather small. 
The pericardium of oval form, large, having the length of 
3.5mm. The sanguineous gland whitish, of the length of 2.5 mm. 
by a breadth (at the anterior end) of 2.5mm. The renal syrinx 
short-pyriform ; the tube of the organ strong. 
The hermaphroditic gland not much developed, paler than 
the liver, with large odgene cells. The anterior genital mass 
small, about 1.5 mm. long by a height of 0.75 and a breadth of 
about 0.5mm. The ampulla of the hermaphroditic duct yellow- 
ish, rather long, forming corkscrew-like windings. The sperma- 
toduct not long, passing into the short penis. This, with its 
armature of very minute hooks, the spermatotheea, the spermato- 
eysta and the vagina, as far as could be determined, as in the 
typical Triopa.! The gland whitish. 
' See for comparison, Pl. XV, fig. 18. 
