D. BRYCE ON MACROTRAOHELOUS CALLIDINiE. 441 



in CalL longirostris, but less developed. The rami have very 

 strong comb-like outer margins, usually of a dark golden or brown 

 colour, and a fifth tooth is sometimes faintly indicated. Median 

 ventral salivary gland conspicuously large. Yolk-mass with 8 

 to 12 nuclei, the germ-mass with 11 minute nuclei. Four massive 

 foot-glands, built up of very large cells, extend, alongside the in- 

 testine, far into the body cavity. They unite and send many fine 

 strands to the disc terminating the last tube-like foot segment. 

 This disc, apparently formed from two toes (and having in direct 

 view the outline of an oval pinched in laterally), has eight perfora- 

 tions, through which discharge the canaliculi proceeding from the 

 foot-glands, and an extremely delicate flickering (as of cilia) was 

 noticed at the extreme end of the disc. Antenna short and two- 

 jointed. The excretory system has six vibratile tags (on each side). 

 The brain is posteriorly three-lobed. Janson further describes 

 (what he regards as) the winter or resting-egg of this species as 

 having its surface covered with short, sharp spines, whose points 

 are directed towards the two poles of the egg. 



A form which I have found in moss from widely separated 

 localities is, I have little doubt, that described by Janson. The 

 most important difference is the structure of the upper lip, a 

 character which Janson does not appear to value so highly as I do. 

 In my examples the two lobes of the upper lip were rather promi- 

 nent, and were separated by a conspicuous U-shaped sulcus, whereas 

 he has drawn them as almost contiguous, divided only by a narrow 

 notch. None which I have yet measured have exceeded in length 

 4'43 micruns. In one measuring (427) when extended the extreme 

 length of the corona when feeding was (87), of the collar (67), 

 while the narrowest neck dimension was (48). This proportion of 

 corona to neck is at first sight widely different from that indicated 

 by Janson, but it is probable that his comparison is based upon the 

 greatest width of the neck. In my view this latter method of com- 

 parison is rather unreliable, though certainly preferable to a com- 

 parison of the corona with the body-width, which Janson very 

 properly condemns as fallacious. I prefer to compare, firstly, the 

 corona-width with the collar-width and the narrowest neck-width ; 

 and, secondly, the corona-width with the length of the individual 

 specimen, when extended as in crawling. 



The species is easily distinguished from all other Callidin^ by 

 the peculiar swollen bases or cushions upon which are seated the 



