50 WILLIAM A. HASWELL. 
Fic. 18.—Outer ends of two of the striated fibres in situ with the 
ganglion-cell and its processes in focus. a, the connecting processes. 
Fie. 19.—Outer end of half a similar fibre in a chloride of gold specimen, 
showing the ramifications of the processes of the ganglion-cells. a, the con- 
necting processes. 
Fig. 20.—From longitudinal section of the gizzard of Syllis corruscans, 
showing transverse section of half of a fibre towards the outer end. az. 
Annular band of non-striated muscle. x 1000. 
PLATE V. 
Fic. 21.—Transverse section of the gizzard of Syllis nigropunctata, 
stained with hematoxylin. «@. Outer layer of non-striated muscle. 4. Hpi- 
thelium, with cuticle and inner layer of non-striated muscle. x 400. 
Fic. 22.—From transverse section of the gizzard of Syllis nigropune- 
tata, showing one radiating fibre with a single transverse network (¢r.). 
a. Outer layer of non-striated fibres. 0. Epithelium, with cuticle and inner 
layer of non-striated muscle. ~. Nucleus of ganglion-cell. 
Fic. 23.—Portion of a longitudinal section of the gizzard of Syllis 
nigropunctata, including longitudinal section of two fibres with their 
single transverse networks (¢r.), their central core (co.), with the ganglion- 
cell and its nucleus (z.). @ and J, as in preceding. The annular band of 
non-striated fibres (az.) is here (close to the lateral raphe) situated towards 
the inner end of the fibre. 
Fic. 24.—From transverse section of the gizzard of Syllis kinbergiana, 
showing fibres with three transverse networks. co. Core, with large granules. 
Fic. 25.—From a longitudinal (nearly medium) section of the gizzard of 
Polynoé. ss, Singly refracting substance. d. Doubly refracting. x. Band 
of nuclei. az. Annular bands of ordinary non-striated fibres. a and 4, as in 
preceding figures. x 200. 
Fic. 26.—Outer end of isolated fibre from the same, stained with chloride 
of gold. x 600. x. Nucleus. 
Fic. 27.—From a longitudinal section of the pharynx of Polynoé, show- 
ing a portion of one of the annular bands of radiating fibres cut transversely 
near the outer ends in the position of the nuclei. az. Hoop-like bands of 
non-striated muscle. Nuclei all stained black. x 600. 
