CYNTHIA SQUAMULOSA. 83 



amidst which the viscera are partially immersed. 

 These pallial nodules are developed also on the surface 

 of the reproductive organs, filling up in a great measure 

 the depressions between the various parts, and likewise 

 insinuating themselves amidst, the hepatic lobules ; they 

 are very irregular in form, some being rounded, others 

 elongated and even produced into points and angles. 



There are six folds on each side of the branchial sac 

 (PL XXXI, fig. 6) ; the anterior ones are the shortest, 

 the posterior pair are narrower than the rest and 

 diminish in width downwards. The primary vessels 

 are alternately large and small, and the stomata are 

 long with the small intermediate primary vessels 

 crossing them. The longitudinal rods are rather 



FIG. 53. A bi-pinnate tentacular filament of Cynthia squamulosa. 



Highly magnified. 



narrow ; there are six or seven on the folds and three 

 or four between them. The tentacular filaments are 

 large, vary in size, and are usually simply pinnate 

 (PL XL, fig. 7), but occasionally show a tendency to 

 become bi-pinnate (fig. 53). The branchial tubercle 

 (PL XL VIII, fig. 5) is small and forms a simple loop 

 opening upwards. The oral tentacles are minute and 

 are twenty-eight or thirty in number, and compressed 

 a little from back to front. 



The alimentary tube forms a simple transverse loop, 

 extending almost across the pallial sac, and is pretty 

 equal in calibre throughout ; the stomach is elongated 

 and very slightly enlarged, and the rectal portion, 

 which is turned forward, is short and a little reduced 

 in diameter ; the margin of the anus is smooth. The 

 liver (PL XXXI, fig. 7, and fig. 52 in text) is well 



