228 Freda Bage : 



shaped where it opens into the definitely lined sac. The exterior 

 cuticle is continuous over the cells linine: the lumen of the tube 

 and funnel, ending suddenly just where the cubic cells pass into 

 the simple pavement epithelial cells linintr the large sac. 

 (Plate VI., Fig. 3, x). 



The following structures are also well marked in my series 

 of sections ; and are indicated in the figures : — 



1. A large gland situated between the openings of the two 

 duots, but having no connection with the organs in question. 

 (Plate VI., Figs. 2, 3 and 5, g.l.) 



2. Two nen^e masses cut in transverse section close to space 

 (A), but with no connection of any kind with the organs treated 

 above. Henoe the latter are not sensory in function, as Darwin 

 [2] thought. (Plate VI., Figs. 2, 3 and 5, t.n.) 



3. Definite bands of muscle on each side enter w^here the 

 body of the animal is attached to the peduncle, and pass to the 

 wall of cavity (A). (Plate V-I., Figs 2, 3 and 4, l.m., o.m.) 



4. On each side of the body a tubular looking structure, 

 apparently lined by chitin, passes from the exterior to the side 

 of the space (A). T can find no opening from it into (A), and 

 can suggest no function for it. (Plate VI., Fig. 2, z.) 



These sacs and their various accompanying parts are appa- 

 rently common to all Cin-ipedes, and their function and signifi- 

 cance have given rise to much discussion aniDUg all who have 

 worked at them, many varying opinions being held. 



Darwin's description for Ibia cumingii [2] of the orifice open- 

 ing between the outer and inner maxillae and leading into a sac 

 lined by a pulpy corium, and over part of which the outer integu- 

 ment is inflected, appears to me to be quite correct as far as 

 structure goes, though his supposition as to the olfactorj' func- 

 tion of the sac is not now generally accepted. The absence of 

 any nerve to the sac shows that it cannot be of a sensoiy nature. 



Hoek [12] points out that Darwin's sac is not closed at the 

 bottom, but gives entrance to the body cavity of the animal. 

 I cannot help thinking that Darwin intended by this sac the 

 space called body cavity by Hoek, and in that case Hoek's 

 description a,gi*ee8 with that of Darwin. 



In comparing my figures with those of Hoek for Scalpelhim 

 [12] several dift'erences can be seen. In the first place, Hoek 



