96 On the Follicle-cells in Salpa 



As before mentioned, Brooks has given exactly this inter- 

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

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

 Korotneff's more recent papers giving a different interpreta- 

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

 species Heider studied) not only the follicle nuclei but 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 

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

 from them. In S. pinnafa and S. hexagona no 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 especially 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. 



ToDABO. — " Sui primi fenomeni dello svilluppo delle Salpe,^' Atti 



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

 . " Sui- les premiers pbeuoiueues dela developpement des Salpes." 



Arch. Ital, d. Biol. vol. ii. p. 1. 

 Salensky. — " Neue Untersucliungen liber die Enibryonale Entwick- 



luDg der Saljmi." Mittheil. a. d. zool. Stat, zu Neapel, 4 Bd, 



pp. '90-171 aud 327-402. 

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



tory of the Johns Hopkins Univ. vol. ii. pp. 1-303. 

 Heidee.— "Beitrage ziir Embryologie von ^alpa fvsiformis, Cuv." 



Abhandl. d. Senkenb. naturf. Oes. Bd. xviii. pp. 367-455. 

 KoEOTNEFF. — "I. Tiuiicatenstudien." Mitth. a. d. zool. Stat, zu 



Neapel, 11 Bd. pp. 335-367. 

 . "II. Y.mhYjolcigiGdi&x Salpa democrntica {mucroncita)." Zeitsch. 



f. wiss. Zool. 59 Bd. p. 29. 

 . "III. Zur Embryologie von Salpa cordiformis-zonaria und 



musculom-punctata.'''' Mitth. a. d. zool. Stat, zu Neapel, 12 Bd. 



pp. 331-352. 

 . "IV. Zur Embryologie A'on«S'rt/^j«rM?ic?'/2«<«-/«s?/b?'«2/s." Zeitsch 



f. wiss. Zool. 62 Bd. pp. 395-414. 



The Biological Laboratory of the 



Woman's College of Baltimore. 



May 13th, 1897. 



