/ V V \J u 



Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor Cai'US in Leipzig. 

 Zugleich 



Organ der Deutschen Zoologischen Gesellschaft 



Verlag von Wilhelm Engelmann in Leipzig. 



XXII. Band. 3. Juli 1899. No. 591. 



Inhalt: I. >Vissenschaftl. Dlittheiluu^en. 1. M'iieeler, J. Beard on the Sexual Phases of 

 MìjBOstoma. 2. Russo, Sulla omolo^jia dell' organo assile dei Crinoidi e sn altro quistioni riguar- 

 danti la morfologia degli Echinodermi. (Con 3 figg.) 3. Kerr, The External Features in the Develop- 

 ment of Lepidosireìi paradoxa. Fitz. 4. Seiuou, Weitere Beiträge zur Physiologie der Dipnoerâossen, 

 auf Grund neuer, von Mr. Arthur Thomson, an gefangenen Exemplaren von Ceratodus angestellten 

 Beobachtungen. (Mit 1 Fig.) 5. Jacoby, Ein neuer Wirth für Distomum heterolecithodes Braun, 

 ti. Heynions, Nachtrag zu der Mittheilung über die systematische Stellung der Puliciden. II. Mittheil, 

 aus Museen, Instituten etc. 1. Zoological Society of London. 2. Linneau Society of Netr 

 Soutli Wales. Personal-Sotizen. Necrologe. Litteratur p. 2S1 — 304. 



, I. Wissenschaftliche Mittheilungen. 



1. J. Beard on the Sexual Phases of Myzostoma. 



By William Morton Wheeler. 



eingeg. 12. Mai 1899. 



The 13th volume of the Naples »Mittheilungen« contains an inter- 

 esting rejoinder ' to my paper on the sexual phases of 3Iyzostoma 

 published in the r2th volume of the same periodical 2. Since this re- 

 newed attack contains nothing essentially different from Beard's 

 former note 3, which, I still believe was condignly treated in my paper, 

 I should not feel bound to consider it, were it not that my work has 

 been garbled and misrepresented by Heard. Further justification for 

 replying, if any were needed, might be sought in the consideration 

 that continued controversy may induce some conscientious student 

 who has an opportunity of working at the Naples Station or at the 

 French or Japanese sea-side laboratories to undertake a renewed study 

 of the reproductive organs of the various species of Myzoatoma. 



1 J. Beard, The Sexual Conditions of Myzostoma glabntm (F. S. Leuckart). 

 Mitth. a. d. Zool. Stat. z. Neapel, 13. Bd. 1S98. p. 293—324. Taf. lu. 



2 W, M. Wheeler, The Sexual Phases of 3Iyzostoma. Ibid. 12. Bd. 1896. 

 p. 227— 302. Taf. 10—12. 



3 John Beard, The Nature of the Hermaphroditism of Myzostoma. Zool. 

 Anzeig. 17. Jahrg. 1894. p. 399—404. 



22 



