EXPLORATION OF ALASKA. 233 
branchial leaves and the anus otherwise naked.! The genital open- 
ing as usual. The foot rather large, with a very fine furrow in the 
anterior margin. ‘The head as usual; the tentacles relatively rather 
large. 
The three individuals were dissected. The peritoneum was color- 
less. 
The central nervous system quite as in the former species, the vis- 
ceral ganglions lying outside of the cerebral; no distal olfactory 
ganglion could be detected; the buccal ganglia connected through a 
commissure at least as long as the diameter of the ganglion; the 
gastro-cesophageal ganglia and the eyes as in the former species. 
The otocysts could not be detected. In the leaves of the rhinophoria 
the spicula much more scanty. In the skin the same kind of not 
much calcified spicula as in the former species; the papille of the 
back very richly endowed with such, and commonly with a mass of 
them projecting with their points (PI. LX, fig. 16) on the surface of the 
papille. 
The bulbus pharyngeus as in the former species; the length about 
1.5 mm., two-fifths of which is the straight, backwards projecting 
sheath of the radula; the cuticula of the lip-disk as usual; the 
buccal crop somewhat compressed, with rather long pedicel. The 
tongue with nine or ten rows of plates, farther backwards sixteen or 
seventeen developed and three younger rows; the total number of 
them, twenty-nine or thirty. The median plates (fig. 9a, 10a) nearly 
as in the former species, or a little shorter. The large lateral plates 
(fig. 9b, 10D) rising to the height of 0.12 mm., yellow; their form as 
in the former species, but at the inside of the hook at its root were 
three to six or seven to eight small denticles. The external lateral 
plates (fig. 10cd, 11) farther backwards, in number constantly eight ; 
the outermost (fig. 11a) very small, the others as in the former species. 
The saltvary glands, as far as could be determined, were as in the 
last species; so also the esophagus and crop; also the stomach and 
the intestine, which seemed to have the usual bag (pancreas, biliary 
sac) at the pyloric part. The sanguineous gland flattened, grayish, 
cordate. The liver of brownish-gray color. 
In the hermaphroditic gland no ripe elements were found, and the 
anterior genital mass was very small. 
1 According to Dall, the ‘‘anus is terminal under the edge of the mantle.”’ 
This was erroneous. He did not see the gill, but regarded the dorsal papilla 
as ‘branchial appendages.”’ 
