EARLY DEVELOPMENT OF JULUS TERRESTRIS. 467 
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on aa 
EXPLANATION OF PLATE@ XXIII & XXIV, 
Hlustrating Mr. F. G. Heathcote’s Paper on “ The Early 
Development of Julus terrestris.” 
Complete List of Reference Letters. 
bl. Blastoderm. c. iz mes. Cavity in mesoderm. ch. Chorion. ceph. seg. 
Cephalic segment. c. p. Central mass of protoplasm. dors. ec. Dorsal ecto- 
derm. ‘ec. Ectoderm. /f. Follicular envelope. g/. Ganglion. ez. Endoderm. 
don. fur. Longitudinal furrow. m. Mesoderm. Maip. ¢. Malpighian tube. 
mes. 6, Mesodermal bands. mem. ex. Membranous envelope. mesen. Mesen- 
teron. mes. Mesoderm. mes. hy. Mesoderm cells directly derived from 
endoderm. m./. Mesodermickeel. xu. Nucleus. zucl. Nucleolus. p. netw. 
Protoplasmic network. pr. Proctodeum. proc. Process. r. Ring. r. ap. 
Rudimentary appendage. rem. %. Remainder of keel. sey. Segment. s. m. 
Segmentation mass. som. m. Somatic mesoderm. sp. m. Splanchnic meso- 
