245 
NOTE on SALENSKY’S account of the DEVELOP- 
MENT of the STIGMATA in PYROSOMA, 
By W. Garstane, M.A., F.Z.S., 
NATURALIST AT THE PLYMOUTH BIOLOGICAL STATION. 
[Read 14th April, 1893.] 
THE concluding part of Salensky’s valuable ‘‘ Contribu- 
tions to the Developmental History of Pyrosoma’’ (Spen- 
gel’s Zool. Jahrbuch, Abth. f. Anat. u. Ont, vi, 1891) 
contains a curious inaccuracy, which although it offers 
little difficulty to those acquainted with the structure of 
Pyrosoma is likely to cause temporary confusion in the 
minds of many readers. Salensky, when dealing with 
the development of the stigmata, says (p. 32):—‘‘ Die 
kiemenspalten liegen der longitudinalen axe des embryos 
parallel und mussen also als longitudinale kiemenspalten 
bezeichnet werden. Da aber die Langsaxe des in der 
Entwicklung beeriffenen Ascidiozoids der Queraxe des 
definitiven entspricht, so muss man die Liangspalten 
eigentlich als die definitiven Querspalten betrachten:”’ 
v.e., the stigmata in the embryo are parallel with the 
endostyle while in the adult they are elongated at right 
angles toit. In the same paper, however, three diagrams 
are given (p. 9) representing the chief stages in the devel- 
opment of an Ascidiozoid, ‘zur Hrlauterung des Textes.”’ 
In the first of these diagrams (fig. 1) which represents an 
early stage in development, the stigmata are seen to be 
elongated at right angles to the endostyle and parallel with 
the transverse axis of the embryo; in the third (fig. 3)— 
which is supposed to represent the ‘“‘ ausgebildetes Ascid- 
iozoid’’—the stigmata are shewn parallel with the endo- 
style and with the longitudinal axis of the body; and fig. 2 
