158 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. r»5. 



more strongly thickened. 



0S^&k 





Fig. 10.— Polytoreutus chaloneei 

 Section througp esophageal pouch 



The large thick-walled gizzard is in 5. 

 The unpaired esophageal pouches in 9, 

 10, and 11 are ventrad of the alimentary 

 tract and open into it by short, wide 

 ducts (fig. 10). These pouches are 

 ovoid, highly vascular bodies. The 

 paired calciferous glands are in 13 and 

 renif orm in shape. Hearts are in 9-11 ; 

 those of 9 are relatively small and those 

 of 10 and 11 quite large. The sperma- 

 ries in 11 are included in sperm vesicles 

 which seem to unite across the median 

 line in the anterior ventral part of the 

 somite, between the nerve cord and the 

 ventral vessel. The connecting portion 

 is tubular and of rather small diameter. 

 The spermiducal funnels are included in 

 the sperm vesicles; but the greatly 

 OF SOMITE 10. X55. e, Esophagus; enlarged sperm magazines lie outside 



e p, esophageal pouch. ,„ ^^, t -i - n ^ , i t i • i 



(fig. 11), and chiefly laterad and anteriad 

 of them. From the sperm magazines the sperm ducts extend through 

 septum 11/12, and »i 



then laterad to the 

 body wall between 

 seta lines a and &, 

 and then posteriad 

 to the anterior part 

 of 18 where each 

 enters a rather small 

 diverticulimi of the 

 corresponding pros- 

 tate gland. 



The cavities of the 

 sperm sacs are con- 

 tinuous with those of 

 the sperm vesicles 

 (fig. 11, 56') and the 

 sacs extend posteriad 

 through a consider- 

 able number of so- 

 mites. They are 

 quite slender as far 

 as the posterior 



.# 



'~-4ifr 







rf'Si^^ 



;<-/ .<-z.- 



Fig. 11.— Polytoreutus chaloneri. Longitudinal section re- 

 constructed FROM SEVERAL SECTIONS PASSING THROUGH THE SPERM 

 DUCT AND SPERM VESICLE. X35. S C, SPERM CELLS; sd f, SPER- 

 MIDUCAL funnel; s m, sperm magazine; sp d, sperm duct; 



« S, OPENING INTO SPERM SAC: St f, FURCAL BRANCH OF SPERMA- 

 THECA; S V, SPERM VESICLE (LARGER IN SECTIONS NEARER MIDDLE 



OP WORM); sy, spermary. 



borders of the calciferous glands and the spermathecal furcae 



