s 
GYMNOSOMATOUS PTEROPODA 395 
vibratmg very readily in the regular manner. The liver is 
ved, and practically fills one third of the viscéral cavitv the 
heart may be seen on its 
left side. The entire sur¬ 
face, including the head, 
is everywhere studded 
with innumerable circu- 
lar, oblong, and conic bo- 
dies which vary in size. 
They are particularly a- 
bundant in the posterior 
end. The body is eve- 
rywhere covered with ve¬ 
ry fine, closely set, vibra- 
tile cilia which give to • 
the organism, gentle, 
progressive movements 
though it is otherwise 
apparently at^rest. 
J rîcliocyeliis 
Eschscholtz (1825.) 
Distribution: T. du- 
merili Oken, South At¬ 
lantic Océan; 
T . mediterraneus Costa, 
Mediterranean Sea. Both 
of these species hâve been 
emerged with N otobran- 
chsea and Clionopsis^ res- 
pectively (oide: Pelse- 
neer, 1887, Part I, pp.34, 
35, 40.) 
Fig. 2.—Drawing from life of a contracted speci- 
men of Clione hincaidi (sp.nop.), ventral view. 
(Compare with figure 1.) 
T. hansine'énsis {sp. nov.), Puget Sound (Friday Harbor) 
Washington (fig. 3-5.) 
The speoimens upon which this species is based were collect- 
ed in the same territory as the preceeding type. They occur- 
