14 PORTER. 
EXPLANATION OF PLATES. 
All the figures were outlined with an Abbé camera lucida. The very high 
magnifications were obtained with a Zeiss 1.5 mm. apochromatic homogeneous 
immersion objective and compensating oculars nos. 4, 6, and 12. 
ABBREVIATIONS. 
cau, cavity. gran, granules. 
chr, chromatin. mb, membrane. 
cps, capsule. mu, muscle. 
cp. sng, blood corpuscles. nl, nucleus. 
crs, crest of ridge. prmer, protomerite. 
cta, cuticula. ; pr pl, protoplasm. 
cul, ridge. rtl, reticulum. 
cys, cyst. TUL, crease. 
de, teeth. Spo, spores. 
dep, depression. SpO'L0, 
deu’mer, deutomerite. spo'go’", ¢ Sporogonia. 
e’mer,  epimerite. SpOg0,” 
Sas, band. sul, furrow. 
jil, filament. vac, vacuole. 
