130 
RICHAED ASSHETON. 
plieral nei-ves radiate from the ganglia to the lophophore and 
body-kidneys (if such they he), tlie body-wall, gut-wall, and 
lophophore, which in plan can be represented by the accom- 
panying diagram. But I must confess that I have not suc- 
ceeded in tracing out the termination of the finer branches. 
In specimens which have been left alive in sea-water con- 
taining methylene-blue there ai'e rows of cells along the 
stalk which stain blue (fig. 21), and one particularly pro- 
minent row runs along the mid-dorsal line of the stalk (fig. 
Text-fig. 4. 
L. saltans. Nervous system (thick lines), a, h. Lopbophoral 
kidneys, c. Body kidney. 
21). This prominent row is confined in L. saltans to the 
stalk; it dies away as the stalk passes into the body and also 
as it joins the foot. A similar row of cells has been described 
by Salensky for L. crassicauda and L. tethyte (though 
Harmer (4) did not find it in L. tethyae), and by Nicker- 
son in L. Davenporti. Salensky considered them to be 
gland-cells, and Nickerson appears to agree with him, 
although “ no conditions have been observed which point to 
a^discharge of the contents.” It seems to me not improbable 
that these cells may be nervous, or neuro-muscular, forming 
perhaps a kind of muscle plate centre of nervous impulse in 
