398 L. DONOASTKR. 



PLATE 2]. 



Fig. 30. — Part of longitudinal horizontal section tlirounjh embryo sliortly 

 before liatchinfir, to show development of muscles, x 1000. 



Pig. 31. — S. enflata. Second day. Transverse section througli rec^ion 

 of ventral ganglion, x 750. 



Pig. 32. — S. enflata. Third day. Transverse section through genital 

 cells. X 900. 



Pig. 33. — S. enflata. Pourth day. Transverse section througli ventral 

 ganglion, x 750. 



Pig. 34. — S. enflata. Ninth day (same specimen as Figs. 27 — 29). 

 Transverse section through ventral ganglion, x 375. 



Pig. 35. — Same larva; section through female genital cell, x 375. 



Pig. 36, — Transverse section through seminal vesicle of a young S. 

 enflata. x 550. 



Pig. 37. — Vas deferens of same specimen, x 550. 

 Pig. 38. — Transverse section of young ovary in same specimen, x 200. 

 Pig. 39. — Transverse section of ovary and developing oviduct in S. 

 minima approaching maturity, x 550. 



Pig. 40. — Anterior part of adult S. minima to show spurious septa. 



Pig. 41. — Transverse section of adult S. minima near posterior end of 

 trunk. X 200. 



Pig. 42. — Section of same near middle of trunk reirion. x 200. 



