*]6 ALLEN 



in size as these organs increase in size toward the breedincj 

 season, which is in January at Monterey Bay. In the female 

 these vessels branch before reaching the ovaries and these 

 branches spread out over the outer and inner surfaces of the 

 ovaries ; while in the male these branches penetrate directly 

 into the testes. No common spermatic artery is formed in 

 either male or female bv the anastomosis of these branches, to 

 pass between and parallel with the reproductive organs, as is 

 the case with the veins. The anterior spermatic artery (PL I, 

 figs. I and lo ; Sper.A.j) arises from the ventral surface of the 

 aorta and passing obliquely ventrad across the left side of the 

 kidne}', gives off i or 2 renal arteries for the kidney and an 

 intercostal artery, which passes ventrad between the 2 adjacent 

 myotomes ; the main spermatic trunk also continues ventrad 

 to break up on the anterior surface of the ovaries or to pene- 

 trate the testes. The secotid spermatic artery (PI. I, figs, i and 

 10 ; Sper. A.,) is given off from the aorta, about the distance 

 of 2 vertebrge from the first spermatic arter}', and in like manner 

 sends off renal and intercostal arteries for the kidney and bod}'- 

 wall ; while the main trunk supplies the middle portion of the 

 ovaries or testes. The third or posterior spermatic artery (PI. 

 I, figs. I and 10; Sper.A.3) is much the largest; in addition to 

 supplj'ing the ordinary renal and intercostal arteries, it gives off 

 from I to 3 sziprarenal arteries (PL I, figs, i and 10 ; Sr.A.) 

 for that gland. In fig. i the third spermatic arterj'' passed in 

 front of the gland and only one artery was observed to enter 

 the gland ; w^hile in fig. 10 the main arter}^ passed behind the 

 gland and at least 3 arteries were seen to penetrate it. In the 

 specimen from which fig. i was drawn the posterior mesenteric 

 artery (fig. i ; P.Mes.A.) arises from the last spermatic arterj', 

 passing behind the posterior mesenteric vein, it continues ven- 

 trad with it between the ovaries to supply the rectum and anas- 

 tomoses with intestinal artery^) ; while in the specimen from 

 which fig. 10 was drawn the posterior mesenteric artery was 

 given off much further dorsad and at first entered the kidney as 

 a renal artery ; then passing ventrad between the testes with the 

 corresponding vein, supplied the rectum, but did not anastomose 

 with intestinal artery^, ; while in still other specimens the pos- 



