452 D. BRYCE ON MACROTRACllELOUS CALLIDIN^. 



narrow cleft. Antenna short. Rami, formula |. Length when 

 feeding (275). 



My particulars of this species, of which I found a single example 

 on two different occasions in ground moss collected near Bognor, are 

 less complete than I could have wished. When feeding it extends 

 itself to its utmost (a rather unusual habit among Callidinse), dis- 

 playing a slender head, neck, and trunk, and a rather short foot, 

 with stout but short spurs. At the collar level, but really arising 

 from the lateral margins of the mouth, there is on each side a 

 rather prominent and almost pointed swelling, best seen in ventral 

 aspect, and giving, at first glance, the appearance of a wider collar 

 than is actually present. That the mouth border should be 

 thickened at the sides is usual among the Philodinadse, but it is 

 unusual that this thickening should result in or be'supplemented by 

 external and prominent swellings. This curious character is also 

 present iu the species next to be described, but in that case it can 

 scarcely be seen except when looking directly upon the mouth from 

 above. 



The outstretched attitude, the generally slender body, the 

 peculiarities of the corona and of the mouth border sufficiently, at 

 all events as yet, distinguish the species, which seems uncommon. 



Callidina ereniita, n. sp. (PI. XXIIL, Fig. 3.) 



Sp. Ch. — Small, with slender head and neck, and swollen 

 central trunk. Skin smooth, with strong lateral folds. Corona, 

 moderately spreading, (38) ; discs on high diverging pedicels, 

 separated by a deep U-shaped sulcus, in which is conspicuous 

 a small setiform fleshy tooth, (5) long and (1) diam. Upper 

 lip remote from pedicels, of simple, bold, curved outline, lateral 

 mouth margins externally swollen. Collar (28) ; neck (25), of 

 long narrow segments, and with a distinct annular thickening at 

 level of antenna. Mastax rather scutelliform ; rami (17) ; for- 

 mula, I to f. Foot extremely short, only visible when animal 

 dislodged and crawling. Spurs, very minute cones or absent. 

 Food moulded into pellets. Secretes a flask-shaped case, at first 

 colourless, but gradually becoming brown. 



An extremely interesting species, with many distinctive marks. 

 In preceding papers I have recorded the tube-dwelling habits 

 of Call, elegans, Milne, and Call, pusilla. In both instances 

 the tubes appeared externally to be a more or less rough 



