96 On the Follicle-cells in Sal pa 



As before mentioned. Brooks has given exactly this inter- 

 pretation of the bodies Avithin the blastomeres, and this con- 

 firmatory note wonld be uncalled for except for Heider's and 

 KorotneflP's more recent papers giving a different interpreta- 

 tion. It is possible that in S. runcinata-fusiformis (the 

 species Heider studied) not only the follicle nuclei bat also 

 their cytoplasm may be ingested by the blastomeres; but I 

 am more inclined to believe Heider was mistaken when he 

 figured these bodies as nucleated cells. His figures are not 

 diawn with careful attention to detail, so it is hard to judge 

 from them. In 8. pinnata and ^S*. hexagona iio cell-walls can 

 be made out in the mass of migrated follicle-cells. It is 

 therefore by no means probable that the cytoplasm of the 

 follicle-cells could be seen if it were ingested with the nuclei. 

 This is es[)ecially true in view of the digestive action upon 

 these bodies within the blastomeres. 



Korotneff's and Salensky's statements that these bodies 

 contain no trace of a nucleus within them is, of course, true 

 if they be themselves nuclei. 



References to Literature. 



ToDAEO. — " Sui primi feiiomcni dello svilluppo delle Salpe.'" Atti 



Reale Accad. Liiicei, Trans, vol. iv. p. 86. 

 . " Sur les premiers pbenomeues de la d^veloppement des Satpes.^'' 



Ai'ch. Ital. d. Biol. vol. ii. p. 1. 

 Sai-ensky. — " Neiie Unlersuchiingen iiber die Einbryonale Entwick- 



luiifj- der Saljii'ii." Mitthcil. a. d. zool. Stat, zii Neapcl, 4 Ikl. 



pp. 90-171 and 3-27 -40-2. 

 BiiooKS. — " The Genus Satpa." Memoirs from the Biological liabora- 



tory of the Johns Hopkins Tniv. vol. ii. pp. l-30.'5. 

 Heider. — "Jk'itriige zur Enibrvologie von Salpa fusifanms, Cuv." 



Abhandl. d. Senkenb. naturf. (ies. Bd. xviii, j)p. 367-4oo. 

 KoROTNEFF. — "I. Tunioatenst tullen." Alitth. a. d. zool. Stat, zu 



Neapel, 11 Bd. pp. 33o 3(57. 

 . "II. \\mh\\o\o'r\ii <\i^\ S(dpa democratica {imicroyiatii).^' Zeitsch. 



f. wis.':. Zool. r,9 Bd. p. 29. 

 . "III. Zur Embryolofrie von Salpa cordifonnis-zonaria und 



muscutosa-puncfata.'' Mitth. a. d. zool. Stat, zu Neapel, 12 Bd. 



pp. 331-302. 

 . "IV. ZurEmbryologieTon(S'a/^;«;-«Hc/nflfrt-/j/*»/b/-wi»s." Zeitsch 



f. wiss. Zool. 02 Bd. pp. 395-414. 



The Biological Laboratory of the 



"Woman's College of Baltimore. 



May 13tli, 1897. 



