80 BRITISH TUNICATA. 



on the right side. The primary vessels are irregular 

 in size ; the large ones are stout and have generally a 

 small one between them. The longitudinal rods are 

 wider than they are in the preceding species ; there 

 are usually seven on each side of the folds, and one or 

 two between them. The oral lamina (PI. XLVIII, 

 fig. 4) is narrow, a little undulated above, and it 

 widens somewhat below, but dies o-raduallv out bv the 



O e/ f 



side of the mouth. The branchial tubercle (PI. XLVIII, 

 fig. 4) is rather small, with the ends turned w^ell 

 inwards, but not convoluted ; it is placed a little 

 diagonally, being slightly inclined towards the endo- 



FIG. 51. PIG. 52. 



- - 



- 



.' 



FIG. 51. The livei 1 in Cynthia claudicans. FIG. 52. The liver in Cynthia 

 squamulosa. Both magnified. 



style (PL XXXI, fig. 5), which is rather stout and of 

 a dark warm colour. The tentacular filaments (PI. XL, 

 fig. 6) are fourteen or fifteen in number, large, pretty 

 equal in size, and regularly bipinnate. 



The alimentary canal is placed towards the bottom 

 of the pallial sac ; it forms a deep close loop which 

 passes for some distance upwards by the side of the 

 endostyle ; the stomach is not strongly defined and is 

 obscured by the liver which is spread over its left-hand 

 surface ; the rest of the tube, with the exception of 

 the rectal portion of the intestine, is concealed by the 

 reproductive organs ; the margin of the anus is smooth 

 and reflected. The liver (PL XXXI, fig. 4, and fig. 51 

 in text) is of a pale yellowish-green colour, and is 

 composed of two principal, minutely laminated, masses ; 



