454 D. BRYCE ON AlACROTRACHELOUS CALLIDIN^. 



well-marked teeth on each ramus (slightly diverging towards the 

 inner edge), a faint fourth could sometimes be detected. The 

 lateral skin-folds were rather conspicuous on the trunk. The 

 rostrum is stout but very short. 



It was difficult to make out anything about the internal organs, 

 but in many instances the stomach contained pellets of food. A 

 young specimen seen crawling about was in build rather like others 

 of the small and slender species, but older individuals are very 

 loth to move about, and the trunk becomes swollen, and the foot 

 almost permanently hidden. I thought, in dislodged examples, 

 that I could distinguish two very minute peg-like spurs placed far 

 apart at the lateral angles of a stout joint, but I failed, after 

 repeated efforts, to force their display, far less that of the toes. 



It seems obvious that this Callidina has acquired its long neck, 

 its swollen trunk, and its short and constantly hidden foot after 

 becoming a tube-dweller. In these points of habit and of build it 

 recalls Call, reclusa, which dwells in the cortical cells of the 

 branches of Sphagnum, and which has to push its head and neck 

 through a small natural opening in the cell wall. 



The species was found in wall mosses from various localities near 

 Bognor, but from its retiring habits is not easy to detect. 



Reference is made by small numbers after names of authors to 

 the following works : — 



1. Ehrenberg. — Fortgesetzte Beobachtungen iiber atmosphii- 

 rische mikroskopische Organismen. No varum specierum diagnosis. 

 Monatsberichte der Berliner Akad. der Wiss., p. 380, 1848. 



2. Ehrenherg. — Uber neue Anschauungen des Kleinsten nord- 

 lichen Polarlebens. Monatsberichte der Berl. Akad. der Wiss., 

 p. 529, 1853. 



3. a T. Hudson and P. H. Gosse.—'IhQ Eotifera or Wheel- 

 animalcules, London, 1886, and Supplement, 1889. 



4. 0. Janson. — Versuch einer Ubersicht iiber die Rotatorien- 

 Familie der Philodinaien. Beilage zum xii. Bande der Abhandl. 

 des Naturw. Vereins zu Bremen, 1893. 



5. W. Milne. — On the defectiveness of the Eyespot as a means 

 of Generic Distinction in the Philodinjea. Proc. Phil. Soc, 

 Glasgow, 1886. 



6. L. Plate. — Beitriige zur Natnrgeschichte der Rotatorien. 

 Jen. Zeitschr. fiir Naturwiss., Vol. xix., Part i., 1885. 



