EXPLORATION OF ALASKA. DAYQ 
buceal crop making nearly half of the whole bulbus, and of the usual 
form ; the walls very thick ; the compressed and rather small cavity 
communicating through a long cleft with the anterior half of the 
small buccal cavity. The lip-disk (fig. 1) of rounded contour, clothed 
throughout its whole breadth (on each side to about 0.5 mm.) with the 
light, horn-yellow colored armature; the lowest part of this, as usual 
in the Acanthodorides, injured or wanting; the breadth of the belt 
decreasing towards the upper end, where it is interrupted in the middle 
line, also at the lower end. The armature (fig. 2b), 3), 4) composed 
of hooks, whose points are directed forwards (towards the opening of 
the mouth), nearly like, but still differing a little from those in the 
typical Ac. pilosa, reaching the height of about 0.04 mm., yellowish, 
with rounded, bifid or irregularly cleft points. The lancet-shaped 
(fig. la, 2a, 3a) blades at the inferior angle of the mouth as usual. 
The tongue with nine or ten series of ‘plates, farther backwards 
thirteen to fifteen developed and three undeveloped series; the tota] 
number in this way, twenty-five to twenty-eight. The large lateral 
plates relatively larger than in the Ac. pilosa, and (fig. 5, 6) less 
thick in the anterior-inferior part of the body, with relatively larger 
hook; the denticulation of this last much weaker and much more 
irregular; in one specimen generally two to four denticles, sometimes 
only a few very insignificant ones or none at all (fig. 6); and this was 
the case with the other specimen, in which only some few plates showed 
two small denticles.'_ he outer lateral plates as in the typical form, 
scarcely more than from four to six. 
The salivary glands whitish, rather strong at their short first part, 
in the rest of their length thin (fig. 7), accompanying the cesophagus 
to the cardia; the duct rather short (fig. 7a). 
The cesophagus forming a little crop,? with thin walls and longitu- 
dinal folds on the inside; in the rest of its length rather thin. The 
stomach rather small, with the usual biliary apertures. The intestine 
(fig. 8a) somewhat inflated in its first part, with many rather strong 
folds and one particularly thick; a little over the point, where it 
appears on the surface of the visceral mass, on the right side, a little, 
scarcely pedunculated bag (fig. 8b), of the length of 1.0 to 1.25 mm., 
with fine, longitudinal folds; the rest of the intestine (fig. 8c) some- 
what narrower; the total length of the intestine about 12.0 to 13.0 
1 Although very like the plates of the Atlantic form, they still bore a 
somewhat peculiar aspect. 
2 Cf. my Gattungen nordischer Doriden, 1. ¢., Taf, xix, fig, 14, 
