1921.J N. Annandale & R. B. S. Sewei.i, : Vivipara. 229 



below the floor of the mantle cavit}- and high up in the chamber 

 it gives ofif a large branch that diverges towards the left side and, 

 where the mantle 



margin merges into „„d r / 



the foot, breaks np 

 into branches. The 

 main trunk of the 

 cephalic aorta is con- 

 tinued on, crossing ^it, I I iU|^,!, mt, 



beneath the oeso- \ \ ^«fe^J/ J /^ '"> 



phagus to reach its \ ^ — ^-^r<— ^=(^^ ^ «" 



right side. In this 

 situation it has the 



sub-intestinal nerve, U/ j//'^~^-^ "■■T""fi ^p" 



lying in a blood ./f — ^4 A )) ' 



sinus, on its right .•' / 



and inthed" the vesi- ^ 



cula seminalis lying ""'" 



directly above it. 



At the anterior end l*'"-. 7. — Vivipara bengalemis. view of the pericar- 

 of the l:)ranchial Jial chamber. The loop of intestine has been turn- 

 , , . ed over to the left side and the kidney downwards and 

 cnaniDer it comes („ t^^, right, alb.g.. albumen tfland; at,,:, auricle: 

 into relationship es.g.. egg-shell gland (receptaculum seminis); I, .a.. 

 with the radular sac hepatic aorta, inl., intestine; k. kidney; /., liver; 

 and passes forwards ""•• °•-^^ophag^>^ ^ ov.d.. oviduct; ;-.. rectum ; ,-..., 

 • . , . , renal onhce into ureter; ,-p.o.. reno-pencardial open- 

 Oil its right side. It ing; sp.tt., supra-intestinal nerve; i,.. uterus; vei,.. 



then dives ventrall}', ventricle. 

 and below and be- 

 hind the pedal commissure it gives ofi a branch to the snout and 

 then divides into anterior and posterior branches which run to the 

 respective regions of the foot. Throughout its course beneath the 

 branchial chamber it gives off a number of fine branches to the 

 muscles of the bod}-. 



■^ The hepatic aorta passes upwards and backwards in the floor 

 of the pericardial cavit}*, immediately to the left of the oeso- 

 phagus. It almost at once gives oft' a large branch which passes 

 at first slightly inwards and upwards to reach the lower wall of 

 the intestine, where it subdivides into two main branches. One of 

 these curves forwards and runs along the under aspect of the first 

 pan of the intestine, supplying branches to it, and the main vessel 

 passes at first forwards as far as the bend of the intestine and then 

 continues on along the second part of the intestine, lying immediately 

 beneath the typhlosole-like ridge on its under aspect. The other 

 branch curves forwards and to the right, crossing behind the 

 oesophagus, and sends branches to the testis in the cf . In the 9 , 

 after supplying branches to the albumen and shell glands, curve;; 

 backwards and to the left and reaches the wall of the uterus 

 where it finally divides into ascending and descending branches, 

 the latter of which is much the longer and larger of the two and 

 runs down the ventral wall as far as the point where the wing-like 



