28 Mr. A. Hancock on the Anatomy of Antiopa Spinolae. 



upper wall, which is very delicate, internal, longitudinal plica3. 

 The lower portion of the stomach, towards the left side (PI. III. 

 fig. 1 d), is covered with a thin coating of a folliculated, glandular 

 substance. Here the intestine (PI. II. fig. 1 d & PI. III. fig. 1 e) 

 leaves the gastric pouch, and doubling back upon it passes 

 across to the right side of the body, down which it runs for some 

 distance, and then turning inward dips under the ovary, and 

 shortly reaches the large, tubular anal nipple (PL II. fig. le& 

 PI. III. fig. 1/), placed on the median line of the back, not far 

 from the posterior extremity of the animal. The intestine is 

 wide, diminishing slightly in caliber towards its termination ; the 

 inner surface being longitudinally plicated throughout. 



The hepatic apparatus is extensively diffused in this species, 

 as it is in all the other Eolididae. Two large anterior hepatic 

 canals open into the upper surface of the stomach, one on each 

 side. These canals on leaving the gastric organ almost imme- 

 diately divide into two branches (PI. II. fig. 1/,/), one of which 

 curves forward (PI. III. fig. \g,g), the other backward {h, h). 

 The two that pass forward stretch along the sides of the back, and 

 turning round in front of the head, are apparently united on the 

 median line. These branches give off from their outward margin 

 numerous ramuscules (#), which divide and subdivide, forming 

 dendritic tufts, some of the twigs of which pass into the anterior 

 branchial papillae. The two posterior branches (h, h) of these 

 hepatic canals, turning backward, run down the sides of the back, 

 and communicate, by similar dendritic tufts, with the papillae on 

 the sides for more than half-way down the body. Here these 

 two latter branches terminate. There is, however, another trunk 

 canal belonging to the hepatic apparatus. This is the great, 

 posterior or central duct (PI. II. fig. 1 h & PL III. fig. 1 t, i) ; 

 it is a little larger in caliber than the anterior canals, and opens 

 into the lower, glandular portion of the stomach a short way in 

 advance of the pylorus, and passing backward, beneath the 

 anterior ovarian mass, sends a branch which ascends between the 

 lobes of the ovary, to communicate with the papillae on the left 

 side in front of the anus. The trunk canal then turning up- 

 ward between the anterior and posterior masses of the ovary on 

 the same side, gives off another branch, which crossing the 

 median line in advance of the anal nipple, subdivides into two 

 portions, one of which bends forward, the other backward ; 

 these go to supply the papillae along the right side near to the 

 anal region. The posterior canal then passes backward above 

 the posterior ovarian mass, and on the left side of the anus. It 

 now assumes a more central position, and after sending two or 

 three branches to either side, terminates in a blind sac a little 

 behind the papillae. 



