156 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



under the microscope until they have been stained. They 

 are united to the transverse vessels by triangular mem- 

 branous flaps (PI. VII, fig. 4) of considerable size. The 

 meshes are slightly elongated antero-posteriorly and contain 

 each 3 or 4 stigmata. 



The Dorsal Lamina is represented by a series of large 

 triangular tapering languets (PI. VII, fig. 5, I.). On each 

 side of these an internal longitudinal bar is wanting, 

 and the usual wide connecting ducts are replaced by short 

 rudimentary papillae (PI. VII, fig. 5, c. d .). 



The Tentacles are very numerous and closely placed. 

 There are about forty very small ones placed alternately 

 with the same number of larger, many of which are very 

 long and slender. These larger tentacles seem in some 

 places to be of two sizes occurring alternately, but this 

 arrangement is not constant (see PI. VII, fig. 8). There 

 seems to be no appreciable difference between the ten- 

 tacles of this species and of E. thurstoni. 



The Dorsal Tubercle is circular in outline, but the aper- 

 ture is a transversely directed elliptical slit (PI. VII, fig. 

 6, d, t.) 



The Alimentary Canal is placed on the left side, and 

 scarcely extends behind the branchial sac. There is a 

 single well marked loop between the stomach and the 

 intestine (PL VII, fig. 7), and the rectum makes an obtuse 

 angle with the intestine. The stomach is posteriorly 

 placed. The digestive gland ramifies over the inner (or 

 dorsal) side of the intestine, and the duct, lined by distinct 

 cubical epithelium, runs posteriorly between the intestine 

 and the genital organs (PI. VII, fig. 7, gl.) to open into 

 the stomach. 



The Genital Organs are placed in the intestinal loop 

 a' id have the same general arrangement as h\E. thurstoni. 

 The ova are large and few in number. They form the 



