98 PEOP. ALLMAN ON THE 



auricles and lobes, the complex windings and anastomoses in 

 these of the vessels, and the almost complete disappearance of 

 the tentacles, at first highly developed, like those of Fleuro- 

 IraeMa, changes which result m the very different and remarkable 

 form of the adult Bolina, with its great lobe-like appendages and 

 auricles. 



By far the most elaborate and important treatise which has 

 yet appeared on the Ctenophora is the recent great work of 

 Chun on the ' Ctenophora of the Bay of Naples ' *. This finely 

 illustrated work is one of the many valuable contributions to 

 zoology which we owe to the opportunity of research afforded 

 by the Zoological Station at Naples. It treats of all the principal 

 Cteuophoral groups, in their anatomical, embryological, and syste- 

 matic relations. 



His study of the development of Micharis multicornis is made 

 by Chuu the basis of his general account of Ctenophoral embryo- 

 logy. To the two portions of the egg, the peripheral and the 

 central, to which attention has been already called, he applies the 

 terms " ectoplasm " and " endoplasm." The former he describes 

 as a proper albumen-holding protoplasm, and the latter as a 

 clearer vacuolated " cell-sap," and refers its apparent constitution 

 out of spheres to its vacuolated condition. 



The nucleus, which had escaped detection by the earlier ob- 

 servers, has been found by Chun imbedded in the ectoplasm. 

 Kowalewskyt, though he failed at first to find it, recognized it 

 afterwards in JEschschoUzia and Uucharis, while HertwigJ had 

 seen it in Callianira and Bero'e. Chun now finds it in all the 

 Ctenophora examined by him. 



The egg-cleavage is fully described ; and in his account of its 

 general character he confirms most of the observations made by 

 Agassiz, Pol, Kowalewsky, and myself, while he adds some de- 



* Fauna und Flora des Grolfes von Neapel und der angrenzenden Meeres- 

 Abschnitte. Herausgegeben von der zoologischen Station zu Neapel. I. Mono- 

 graphie. Ctenophora von Dr. Carl Chim. Leipzig, 1880. 



f A. Kowalewsky, Investigations on the Development of the Coelentei*ata, 

 with 8 plates, in the Transactions of the Imperial Society of the Friends of 

 Natural History, Anthropology, and Ethnography, Moscow 1873. This memoir 

 is unfortunately published in the Eussian language, and I am acquainted with 

 it only through an abstract in Hoffmann and Schwalbe's ' Jahresberichte der 

 Anatomie und Physiologie,' 1873. 



I "Ueber den Bau der Otenophoren," Jenaische Zeitsch. f. Naturwiss, 

 Band sir. p. 313 (1880). 



1 



