EAELY DEVELOPMENT OF JULUS TEERBSTRIS. 237 



6. De Geer. — 'Memoires.' 



7. Fabee. — 'Ann. des Sci. Nat.,' 4 ser., vol. iii, 1855. 



8. Gervais. — " fitudes sur les Myriapodes," ' Ann. des Sci. Nat.,' 3 ser., 



vol. ii, 1844. 



9. METSCHNiKori'. — " Embryologie der doppelfiissigen Myriapoden," ' Zeit. 



fiir wiss. Zool.,' 1874. 



10. Metschnikoff. — " Embryologisches iiber Geophilus," 'Zeit. fiir wiss. 



Zool.,' 1875. 



11. Newport. — " Development of Myriapoda," 'Phil. Trans.,' 1841. 



12. W. Patten. — "Development of Phryganids," ' Quart. Journ. Micr. Sci.,' 



October, 1884. 



13. Stecker. — " Die Anlage der Blatter bei den Diplopoden," ' Arch, fiir 



Mic. Anat.,' vol. xiv, 1877. 



14. Ulianin. — " Zur Entwickl. der Amphipoden," ' Zeit. fiir wiss. Zool.,' 



vol. XXXV, 1881. 



15. Waga. — ' Revue Zoologique,' 1840. 



16. F. M. Balfour. — " Notes on the Development of the Araneina," ' Quart. 



Journ. Micr. Sci.,' vol. xx, 1880. 



17. A. Sedgwick. — "The Development of Peripatus Capensis," 'Quart. 



Journ. Micr. Sci.,' July, 1885. 



EXPLANATION OF PLATES XXII & XXIII, 



Illustrating Mr. F. G. Heathcote's Paper on "The Early 

 Development of Julus terrestris." 



Complete List of Reference Letters. 



hi. Blastoderm, c. in mes. Cavity in mesoderm, ch. Chorion, ceph. seg. 

 Cephalic segment, c. p. Central mass of protoplasm, dors. ec. Dorsal ecto- 

 derm, ec. Ectoderm. /. Follicular envelope, gl. Ganglion, en. Endoderm. 

 Ion. fur. Longitudinal furrow. m. Mesoderm. Malp. t. Malpighian tube. 

 mes. b. Mesodermal bands, mem. ex. Membranous envelope, mesen. Mesen- 

 teron. mes. Mesoderm, mes. hy. Mesoderm cells directly derived from 

 endoderm. m. k. Mesodermic keel, nu. Nucleus, nucl. Nucleolus, p. netw. 

 Protoplasmic network, pr. Proctodaeum. proc. Process, r. Ring. r. ap. 

 Rudimentary appendage, rem. k. Remainder of keel. seg. Segment, s. m. 

 Segmentation mass. som. m. Somatic mesoderm. sp. m. Splanchnic meso- 



