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when compared with the Annelides : for in the former it i natural that where 
no other organs are as yet differentiated, that is, transformed or developed 
from what may he termed the crude material (sarcode), the nerve ubstance 
should also be diffused and without definite form. 
We recommend this interesting inquiry to the attention of our readers. 
Note II. — To such of our readers as are desirous of entering more fully 
into this subject, we recommend the careful perusal, not only of the foregoing 
observations by Kcelliker, but of Mr. Bright well’s Paper on the ‘‘Sub- 
division of Noctiluca” ( Micros . Jour., 1857, p. 185), beautifully illustrated 
by Tuffen West. 
DESCRIPTION OF PLATE. 
lig 1. Noctiluca, as commonly observed; enlarged and seen by transparent 
illumination, a. Motile appendage ; b. mass of granular substance 
closing the orifice of the general cavity, and from which the sarcodic 
extensions are seen to radiate. 
Fig. 2. Enlarged Noctiluca seen in darkness, o. Phosphorescent in parts ; 
b. phosphorescent throughout its substance ; c. phosphorescent por- 
tion of a Noctiluca, seen with an enlargement of 240 diameters. 
I'ig. 3. Portion of the sarcodic substance of Noctiluca exhibited transparently, 
and enlarged 150 diameters, a. Large vacuole inclosing particles 
of green matter, and of carmine, swallowed by the animalcule : 
b. smaller vacuoles containing liquid only; c. pans of sarcode con- 
taining vacuoles that have collapsed — this portion of the body is 
amceba-like (constantly changing its form) ; cl, cl, <1, cl, extensions of 
the sarcodic mass, also variable in their character. 
