252 SCIENTIFIC RESULTS OF THE 
plate, farther backwards eighteen developed and three younger rows, 
the total number thirty; the plates denticulated as previously men- 
tioned, the height of the large plates rising to 0.7 mm.; the number 
of external plates four to five. The cesophageal diverticle of a largest 
diameter of about 3.0mm. The pars pylorica of the intestine of about 
4.5 mm. length, with higher folds than in the rest of the intestine, which 
had a length of about 15.0 mm.; the bag at the first part of the intes- 
tine 1.5mm. long. The liver 12.0 mm. long by a breadth of 8.0 and a 
height of 6.0 mm. The sanguineous glands whitish, 5.0 mm. long by 
a breadth of 6.0 mm. and 2.0 mm. thick, convexo-concave, the fore-end 
flattened (by the buccal crop), the hinder end with two transverse fur- 
rows (produced by two coils of the spermatoduct; the anterior genita] 
mass 8.0 mm. long by a breadth of 3.5 and a height of 7.5 mm. The 
ampulla of the hermaphroditic duct 5.0 mm. long, whitish. The coils 
of the spermatoduct and of the vagina in this individual covering the 
upper side of the mucous gland, and ascending to the back between 
the pharyngeal bulbus and the liver; a coil of the former embraced 
the sheath of the radula. The first part of the spermatoduct 12.0 mm. 
long, the last of the length of about 25.0 mm; the penis about 3.5 mm. 
- long, the armature as usual. The spermatotheca nearly spherical, of 
3.5 mm. diameter ; the spermatocysta yellowish, round, with a diameter 
of 1.5 mm.; the chief duct (vagina) 33.0 mm. long with a general 
diameter of 1.2 mm.; the structure of the wall as above; the last, nar- 
rower part (from the m. retractor downwards), 5.0 mm. long, The 
vestibulum, as well as the inferior part of the vagina and of the penis, 
with very scanty black pigment. 
4. Acanthodoris cerulescens, Bgh., n. sp. Plate XIII, fig. 6-7; Plate XIV, fig. 16. 
Color pagine superioris corporis czerulescens. 
Dentes radule hamo per totam fere longitudinem denticulato. 
Hab. Mare Beringianum (Nunivak Island). 
One specimen of this species was found by Dall at the north end of 
Nunivak Island, Bering Sea, in July, 1874, on stony bottom, at the 
depth of eight fathoms. 
According to Dall, the color of the living animal was bluish. The 
animal preserved in alcohol had the length of 14.0 mm. by a height of 
5.0 and a breadth of 8.0 mm. ; the length of the foot was 12.5 mm. by 
a breadth of 6.5 mm.; the height of the rhinophoria 2.0, of the bran- 
chial leaves 1.5 mm. ‘he color uniformly yellowish-white, with the 
back of a slightly bluish hue. 
