278 



CALIFORNIA ACADEMY OF SCIENCES. 



Alimentary. 



Testes. 



Vessels. 



One pair of diverticula of the One single diverticulum of 

 oesophagus in somite ix. the oesophagus. 



Only longitudinal parallel Longitudinal and transverse 

 bloodvessels in the divertic- bloodvessels in the divertic- 

 ulum, ulum. 



Ovaries. 

 Spermathecte. 



Spermiducal 

 pore. 



(Vas deferens) 



rounded by a smaller or 

 greater mass of peritoneal | 

 cells. iSame. 



No gizzard. 



No typhlosole. 



jGizzard generally, but not 

 always absent. 



Same. 



In X and xi, or only in x. 



No subnervian vessel. 



Two pair of large hearts in x 

 and xi. 



One or two pair of prostate 

 glands opening in xvii (and 

 xviii). 



Sperm ducts open in the same 

 pore as the prostate. 



Iia xiii. 



One pair, or none, in viii or 

 ix, generally in ix. Diver- 

 ticula rudimentary or ab- 

 sent. 



Ahvays in xvii 



Same. 

 Same. 



Same. 



One or two pair of prostate 

 glands opening in two con- 

 secutive somites, in xvii, 

 xviii, xix, xx or xxi. 



Sperm ducts open independ- 

 ently of the prostate, and 

 in the same somite as one 

 of the prostates, but not in 

 the same pore. 



Same. 



Two i^air or one pair, in vii, 

 viii. Diverticula rudiment- 

 ary or absent. 



In XA 



