ELIOT : NUDIBRANCHS AND TECTIBRANCHS FROM INDO-PACIFIC. 31^ 



of the roof hangs the gill. It is a strap with a rounded end, 8 to 9 mm. 

 long and 4 to 4. 5 mm. broad, bearing on either side transverse 

 lamellae set in about seven groups, each group containing seven or 

 eight lamellse. On the floor of the chamber below the gill, and close 

 to the genital papilla, is a second gill-like organ about 3 mm. long 

 and 2.5 mm. wide, composed of about ten lamellae. It is apparently 

 an osphradium. The renal organ is composed of numerous fine 

 ramifying tubes. The pericardium and heart apparently lie in the 

 left anterior part of the mantle chamber, but could not be identified 

 with certainty in any specimen. 



The buccal mass is 7 mm. long and 5 mm. broad. It is not 

 striated. The mouth opens into a spacious chamber with puckered 

 walls. The deep brown radula consists of a single series of from 22 

 to 25 teeth, of which from 10 to 15 seem to be in use. It is not 

 ascoglossan ; the anterior teeth show signs of being worn out, and 

 no doubt disappear in the usual way. Seen in the profile the teeth 

 are very erect. (Text Fig. 6). The back part of each is broad at 

 the base and hollowed out so as to receive the anterior part of the 

 succeeding tooth. Each tooth bears from three to five denticles 

 which are sometimes rather irregular in shape and almost double. 



Text Fig. 6. — Three teeth of N'ewnesia antarctica. 



There are no jaws and no buccal crop. The salivary glands are 

 whitish, thick, and foliaceous, about 4 mm. long and 1.5 mm. broad, 

 with very short ducts. 



On leaving the buccal mass, the alimentary tract dilates at once 

 into a large tube which is bent on itself. The first bend (5 mm. long 

 and 2.5 mm. broad) bears a smooth diverticulum on the top about 

 T.5 mm. high. The second bend is 8 mm. long and 3 mm. broad. 

 Ttie tube bears inside about ten longitudinal lamellae studded with 

 prominences. Inside the lamella can be seen yellowish foUiculate 

 bodies which are apparently glandular. 



Somewhat embedded in the front of the liver, but not enclosed by 

 it, is the small round stomach. The interior is lined with irregular 



