[271] Vide Vol. II. p. 374; also Götte, Zool. Anzeiger, No. [80], p. 189.
[272] C. Grobben. “Die Entwick. d. Moina rectirostris.” Arbeit. a. d. zool. Instit. Wien. Vol. II. 1879.
[273] Balbiani (No. [554]) has also recently dealt with this subject, but I cannot bring my own observations into accord with his as to the structure of the Elasmobranch testis.
[274] An entirely different view of the origin of the sperm cells has been adopted by Balbiani, for which the reader is referred to his Memoir (No. [554]).
[275] For a summary of the facts on this subject vide Bronn, Klassen u. Ordnungen d. Thierreichs, Vol. III. p. 404.
[276] It would be interesting to have further information about Balanoglossus.
[277] These views fit in very well with those already put forward in Chapter XIII. on the affinities of the Echinodermata.