210 



à Pejiard ou à Schaudinn le soin de choisir un nouveau vocable ap- 

 proprié. 



Nancy, 17. Mai 1897. 



2. Rectification. 



Je viens de publier dans le Bulletin de la Société Zoologique 

 de France, tome XXII. page. 98 1897 une note intitulée: 



Observations sur Divers Céphalopodes; Troisième note; Cépha- 

 lopodes du Musée Polytechnique de Moscou. — Cette dernière 

 ligne doit être ainsi modifiée: Céphalopodes du Musée Zoologique 

 de l'Université Impériale de Moscou. 



Cette rectification est faite sur la demande du Musée intéressé et 

 afin d'éviter une confusion. 



Dr. L. Joubin 

 Prof, de l'Université de Rennes. 



3. The Follicle Cells in Salpa. 



By Maynard M. Metcalf, Baltimore. 



eingeg. 30. Mai 1897. 



Through the courtesy of Professor Brooks of the Johns Hopkins 

 University, I have been enabled to examine a number of finely pre- 

 served embryos of several species oi Salpa , and I desire after briefly 

 referring to certain points in recent papers upon Salpa embryology 

 to describe such of the results of my study as bear upon the nature 

 and role of the follicle cells. — 



Since the publication, fifteen years ago of Salensky's careful stu- 

 dies [see references at end of paper], interest in the development of 

 this genus has centered more around the follicle cells and their role 

 than around any other point. Salensky showed that the young 

 embryo was composed, in part of a few true blastomeres derived from 

 the fertilized e^^, but more largely of a great mass of cells derived by 

 proliferation from the follicle. He claimed that the true blastomeres 

 early disappear, serving probably to nourish the inwandering follicle 

 cells, from which the adult organism is derived. That is, according 

 to Salensky, the fertilized ovum serves merely as food for its un- 

 fertilized sisters (the follicle cells), which are the really important 

 elements. 



He says — page 362 — »Aus den vorgeführten Stadien läßt sich 

 der Schluß ziehen, daß die Blastomeren fortwährend an Zahl abneh- 

 men, bis sie endlich ganz verschwinden. Diese Erscheinung kann auf 



