63. 



11. Mits-ulcuri. On the Structure and Signif ican.ce of 

 sone Aberrant Forms of LaiTiellibrancliiate Gills. Quart. Jour, 

 micro. Sci. Vol. 21. 1831. 



12. Parker and Has-well. Text -Book of Zoolog7. 



13. Pattens. The Embryology of Patella. Arb. Zool. 

 Institut Univ. Wein. Bd. 6, 1806. 



14. Pelseneer. Report on the Anatomy of the Deep-Sea 

 Mollusca collected by H. M. S. Cliallenger during the years 1872- 

 1876. Challenger Report Vol. 27 Pt. 74, 1838. 



15. Pelseneer. Contribution a' 1 'etude des Lamelli- 

 branchs. Archives de Biologie Tome 11, 1890. 



16. Pruvot . Sur le developpment d'un Solenogastre- 

 Comptes rend. Acad. Paris. Tone III. 1890. 



17. Rawitz. Der Mautelj/rand der Acephalen- Jen. Zeit . 

 fur ITissen. Bd. 28. 1888. 



18. Rice. Die systematische Vearwertbarkeit der Kiemen bei 

 den Lamellibranchiaten — Jen. Zeit. fur ^7issen. Bd. 31, 1897. 



19. Sigerfoos. Notes on the Organization, of the Larva 

 and the Post-larval Development of Ship-^7orrns . Johns Hopkiiis 

 Univ. Circulars, No. 126, 1896. 



20. Tiyon. Structxiral and Systematic .^-^^vx.C'^cr^s^. 



