MACROTKACHELOUS CALLIDlNiE. 201 



Whenever the wheels were withdrawn there became visible 

 the familiar outline of a Callidina, a little stouter than some 

 forms, but not now presenting any obvious peculiarities. 



I noticed that the double flap, terminating the column tip, 

 was rather more developed than usual, but the cilia beneath it 

 were not particularly powerful or conspicuous. The dorsal 

 surface of the column had a perceptible thickening of the 

 hypodermis very noticeable in side view. 



The third segment, to which belong the mouth and the 

 trochal discs, seemed a little bulkier than is usual, and the 

 next carried a very short antenna, about one-fourth of the neck 

 thickness. 



There were the usual skin-folds, dorsal and lateral, lightly 

 marked, whilst the foot had the ordinary short conical spurs. 

 I did not ascertain the mastax formula. 



Callidina pusilla^ n. sp. 



Sp. Ch. — Small, rather slender, trochal discs, about one-half 

 breadth of mouth margin, sulcus reduced to shallow notch, 

 discs on pedicels rather higher than breadth of discs. Mastax 

 formula f , food in pellets, digestive action a periodic heaving of 

 stomach, upper joint of foot with mound-like swelling. Spurs, 

 two short cones. Inhabits brownish, rough-looking tubes. 



Habitat. — Moss from Epping Forest. 



Length. — Largest specimens about li^jth inch, extended. 



Callidina cornigera, n. sp. 



Sp. Gh. — Trochal discs apparently without gap, laterally 

 produced into two horn-like but fleshy processes, whose bases 

 are furnished on inner face with cilia, forming part of principal 

 wreath. Antenna very short, one-fourth of neck- thickness. 



Habitat. — Moss from roadside, near Bognor. 



Length. — Extended about j^^th inch. 



Description of Plate. 



Fig. 2. — Callidina pusilla, wheels protruded, ventral view. 

 „ 2a. — „ „ wheels protruded, lateral view, in 



tube. 

 • „ 3. — Callidina cornigera, wheels protruded, dorsal view. 

 „ 3a. — „ ,, lateral view of horns, 



„ 86. — Column as extended in crawling. 



