110 W. F. PURCELL. 
place of attachment to the entochondrite (seen from the dorsal side). 
A, part of left trunk ; b, anterior part of right trunk (see fig. 21). 
Fig. 43. — (Zeiss '^'1 im., II, hot ale. suhl.) Embryo of Attus 
floricola after the reversion. Transverse section through the ventral 
sinus of the al^domen in the region of the tracheal plate (along the line 
indicated in fig. 28; same stage as figs. 28 and 41). 
