EMBLETONIA. 



triangular form, each apparently consisting of two parallel plates, and furnished at the 

 anterior angle with a cap, the whole being similar to the jaws of Proctonotus. Something 

 like a denticulated cutting edge was observed in front. Within the jaws is placed a long 

 strap-formed tongue, composed of about sixty plates in & pulc/ira, each (fig. 6) bearing a 

 single, stout, recurved central spine : there are no lateral spines. The oesophagus and 

 stomach (fig. 4), which were only indistinctly observed, do not appear to vary materially 

 from those organs in Uolis, though perhaps the digestive sac is more backward in position 

 than usual, consequently the oesophagus is rather long. The intestine is short, and passes in 

 a slightly sinuous course from the upper surface of the stomach to the anal outlet near the 

 third papilla on the right side. Two rather slender hepatic vessels arise from the dorsal 

 aspect of the gastric pouch, one from each side, and, passing forward, branch into the two 

 anterior pairs of papillae, which are symmetrically arranged. The posterior extremity of the 

 stomach receives a stout, central, hepatic vessel, which zig-zags down the median line of 

 the back, immediately below the skin, giving a branch from the angles on each side to the 

 papillse ; hence those of the two sides alternate. The whole of the hepatic vessels and their 

 branches are of a colour resembling that of the papillary gland, which is large, almost filling 

 the external sheath. There is no ovate vesicle in the apex of the papillae, nor are we able 

 to say that there is any external opening in that part. The body is covered with vigorous 

 vibratile cilia ; cilia likewise clothe the surface of the papillae. 



The reproductive organs are bulky ; the testis (fig. 9) being short and thick, and of a 

 tubular form. 



The eye (fig. 7) is composed of a round pigment-cup, a lens and cornea ; the optic 

 nerve is of some, length, and enters from below. The audatory capsule (fig. 8) contains a 

 large, single, spherical otolithe. 



