CYNTHIA TESSELLATA. 91 



fine one between them ; the secondary vessels are 

 rather long and delicate, the stomata have the ex- 

 tremities rounded; there are about six longitudinal 

 bars on the folds, and three or four between them. 

 The oral tentacles (fig. 57), of which there are between 



FIG. 57. Oral tentacles of Cynthia tessellata. Highly magnified. 



twenty and thirty, are long, slender, nearly cylindrical, 

 and finely pointed ; they are placed along a narrow 

 ridge, and increase in length as they approach the 

 mouth. The branchial tubercle (PI. XLVIII, fig. 7) 

 is minute and of an ovate form, placed longitudinally ; 

 no convolutions were observed. The tentacular fila- 

 ments (fig. 58) are about twenty in number, and are 

 alternately large and small; they are somewhat distant, 

 usually pinnate, long, and slender; but as the pinnae 

 occasionally bifurcate or branch they may be con- 

 sidered imperfectly bi-pinnate. 



FIG. 58. A tentacular filament of Cynthia tessellata. Highly magnified. 



The alimentary canal (PL XXXIII, fig. 7) forms a 

 simple, open loop of nearly equal calibre throughout; 

 the stomach is scarcely indicated, except by the 

 presence of the liver, which is composed of two 

 masses, formed of numerous branched lobules, some- 

 times having the appearance of folds or plaits ; they 



