118 INVERTEBRATE MORPHOLOGY. 



LITERATURE. 



A. PORIFERA. 



Vosmaer. Porifera. Bronn's Klassen und Ordnungen des Thierreichs. Leip- 

 zig u. Heidelberg, 1887. 



E. Haeckel. Die Kalkscliwamme. Berlin, 1872. 



F. E. Schulze. Untersuchungen iiber Ban und Entwicklung der Spongien. 



Zeitschr. filr wissensch. Zoologie, xxv-xxxv. 1876-81. 



A. Dendy. Observations on the Structure and Classification of the Calcarea 

 heti i-ni'irln. Quarterly Journal of Microsc. Science, xxxv. 1893. 



E. von Lendenfeld. A Monograph of the Horny Sponges. London, 1889. 



F. E. Schulze. Report on the Hexactinellidcv. Reports on the Scientific Results 



of the Voyage of H.M.S. Challenger. Zoology, xxi. 1887. 



B. CNIDARIA. 



GENERAL. 



L. Agassiz. Contributions to the Natural History of the United States. Vols. 



in and iv. Boston, 1860-62. 

 A. Agassiz. North American Acalephce. Illustr. Catalogue of the Museum of 



Comp. Zoology, n. Cambridge, Mass., 1865. 



E. MetschnikofF. Embryologische Studien an Medusen. Wien, 1886. 

 0. & R. Hertwig. Das Nervensysttm und die Sinnesorgane der Medusen. 



Leipzig, 1878. 



HYDROMEDUS^E. 



G. J. Allman. A Monograph of the Gymnoblastic Hydroids. Ray Society. 



London, 1871-72. 



E. Haeckel. System der Medusen. 1. Craspedoten. Jena, 1879. 



H. N. Moseley. Report on certain Hydroid, Alcyonarian, and Madreporanan 

 Corals. Reports of the Scientific Results of the Voyage of H.M.S. Chal- 

 lenger. Zoology, ii. 1881. 



W. K Brooks. The Life-history of the Hydromedusce. Memoirs Boston Soc. 

 Nat, Hist., in. 1886. 



A. Weismann. Di> Entstehung der Sexualzellen bei den Hydromedusen. Jena, 

 1883. 



H. V. Wilson. T/ic Structure of Cunoctantha octonaria in the Adult and Lar- 

 rul Stages. Studies from the Biol. Laboratory Johns Hopkins University, 

 iv. 1886. 



E. Haeckel. Report on the Siphon ophora>. Reports of the Scientific Results of 

 the Voyage of H.M.S. Challenger. Zoology, xxvili. 1889. 



A. Agassiz. The Porpiti<ln and Velellidw of the Gulf Stream. Memoirs Mu- 

 seum of Comp. Zoology, vni. 1883. 



SCYPHOMEDUS^E. 



E. Haeckel. System der Medusen. II. Acraspeda. Jena, 1880. 



