D. BRYCE ON MACROTRACHELOUS CALLIDINiE. 



437 



also the five new forms Lo be presently described, and one old form, 

 not admitted by Janson, but for which I furnish a new description. 

 It may be useful to note that among the forms rejected as not 

 sufficiently described are two of the Callidince described by Gosse, 

 viz., hihamata 2i\i&'pigra. 



As to certain matters I have arrived at conclusions differing 

 from those of Dr. Janson, Of these only one shall be here 

 referred to, viz., the asserted presence of pellets of food in the 

 stomachs of certain species of Callidinte. He so distinctly implies 

 a repeated error on my part with regard to these pellets that I am 

 compelled to go into the question more fully than I had pre- 

 viously thought needful. In describing the stomach walls of a 

 typical Philodine,he says (p. 9) : — '* The lumen proper is enclosed 

 in a strong cuticle, whose inner side is clothed with cilia; then 

 follows the syncytial real wall, which absorbs the nutrient matter, 

 and is usually coloured brownish or gulden from fatty particles, has 

 distributed in its substance numerous nuclei, and is surrounded 

 externally by a thin membrane. A digestive function was until 

 lately assigned to the pigment enclosed " {i.e., to the coloured 

 fatty particles), " Milne and Bryce regarded them as in many 

 species portions of food, whilst Thompson ^ rightly recognized 

 them as fat particles lying within the stomach wall." In another 

 place (p. (SQ), referring to my description of Call, lata, he states 

 that, according to me, " the fat particles of the stomach are par- 

 ticularly large and conspicuous." 



Dr. Janson has misunderstood the statements made by Milne ^ 

 and by myself if he thought that in our descriptions of food 

 pellets in the stomach either of us referred to tlie well-known 

 fatty particles enclosed in the stomach-wall itself. With Call, 

 constricta, however, it is no difficult matter to demonstrate the 

 presence of food pellets in the stomach. The oesophagus lies 

 rather on the ventral side of the -mastax, and the pellet-making 

 is, therefore, best seen in ventral view, and to secure this a few of 

 the Rotifers should be placed with a very little water on the cover 

 of the live box. After a few minutes they will probably have 

 taken hold of the glass, and have recommenced feeding. A very 

 little carmine may then be placed on the opposite glass of the 

 live box, and the body thereof gently adjusted to the cover. It 

 will now be possible if the Rotifers continue feeding, as constricta 

 probably will, to sec the carmine panicles pass down the long 



