100 Messrs. Hancock and Embleton on the Anatomy of Eolis. 



The anterior aorta, fig. 2 /, passing forwards over the genital 

 organs, and on the right side of the stomach, but on a plane below 

 the ramifications of the digestive system, gives off three or four 

 small arteries, e' e' e' e', to the stomach, and next from its under 

 part a large branch j, which after sending off some small twigs is 

 distributed by two or three branches which ramify on the penis, 

 testis, mucus-gland and ducts. The main trunk, after this, is 

 bent down in front of the genital organs, passes under the oeso- 

 phagus, and becomes applied to the under surface of the buccal 

 mass /I, on the median line, after having given an offset, k, for- 

 wards to the anterior part of the oesophagus and upper surface 

 of the buccal mass. Next, about half-way along the under sur- 

 face of that fleshy organ, it gives off a large artery /, which pene- 

 trates its floor at an aperture left between the muscular bundles, 

 to supply the tongue and the interior of the mouth : shortly 

 after this, a branch springs on each side from the trunk ; these 

 encircle the anterior part of the mass of the jaws just behind the 

 lips, supplymg the muscles that connect the mass to the skin, 

 and the skin itself in the vicinity. Lastly, the anterior aorta 

 terminates in three branches near m, which are distributed by 

 twigs to the lips and the anterior part of the foot. 



The posterior aorta, /', runs a very short way forwards and 

 then turns downwards and backwards, passing under the heart 

 and gastric system ; at this turn, and as it runs backwards, it gives 

 off four or five branches to the rectum, which lies on its right 

 side : one branch to the rectum is sometimes given off from the 

 common aorta just after it has perforated the pericardium. The 

 artery then gains the inferior surface of the ovary, among the 

 lobes of which it is at first partially imbedded. On entering this 

 viscus it at once gives off twigs right and left to the contiguous 

 lobes ; it next bifurcates, one branch passing on to be distributed 

 by small lateral twigs to the middle and posterior lobes of the 

 ovary, among which they can be seen to subdivide two or three 

 times, accompanying the divisions of the oviduct ; the other going 

 to the skin of the foot under the ovary ; seven or eight branches 

 come off from it which penetrate the skin, and can be traced a 

 little way dividing in its substance. 



Thus we c^n demonstrate arteries supplying almost all the 

 viscera and a great portion of the skin of the foot, and show that 

 they undergo minute division, and all the branches laid down in 

 our Plate have been verified by repeated dissection : we have 

 failed however in making out their mode of termination. We 

 cannot undertake to say whether they end by closed extremities, 

 or whether they have open mouths which communicate with 

 lacunse or sinuses in the intervisceral spaces, or with those in the 

 skin. The lacunse among the viscera we have not been able to 

 make out by dissection, and have not made use of injections 



