JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XV, 
Illustrating E. Ray Lankester’s paper on the Sexual Form 
of Chcetogaster Limncei. 
Fig. 
1. — Muscle-cells from the septa of adult Ch. Limncei. 
2. — Segment-organ of adult Ch. Limncei. 
3. — Fasciculus of adult Ch. Limncei , with its bristles turned in two 
directions. 
4. — Ova of Ch. Limncei ; b, acted on by water. 
5. — Cephalic region of Ch. diaphanus, to show the nervous system; eg, 
cephalic ganglion ; stg, so-called stomato-gastric or second supra- 
pharyngeal ganglion ; sphg, subpharyngeal ganglion ; ph, 
pharynx. 
6. — Nerve-cord of Ch. diaphanus ; sphg, subpharyngeal; ce, oesophageal ; 
st, stomachic ; 1 hr, first fascicular ; 2 br, second fascicular, 
ganglion. 
7. — Dorsal vessel of Ch. Limncei (adult). 
8. — Fascicle and segment-organ ( s ) of Ch. diaphanus ; mm, muscles. 
9. — Parthenope serrata of Schmidt, Ctenodrilus pardalis of Claparede (after 
Claparede.) 
