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HARDWICKE'S SCIENCE-GOSSIP. 



[June 1 1868. 



in adjoining cells of a Lemna root. To accommodate 

 themselves to these narrow quarters, their sheaths 

 were placed in the vertical direction, — that of the 

 cells, their spires being thrust out at right angles. 



The Chcetospira Miclleri, though now, I believe, 

 for the first time announced as a British species, 

 will prove, I have little doubt, by no means a rare 

 one. Small, extremely sensitive, retracting within 

 its sheath on small disturbance, slow to emerge 

 from it, and concealed within the Lemna, it may 

 readily be overlooked. I am persuaded, however, 

 that a diligent search for it would be rewarded by 

 its detection in many other localities besides the 

 immediate vicinity of this town. 



Fig. 116. Chatospira mucimla x 380. 



II. Chevtospira mucicola, a more common species 

 in this locality than the preceding, is invested with 

 a mucous covering, and is found on, and not within, 

 the Lemna or other aquatic plants. Shorter and 

 more compressed, the spire makes but a half-turn. 

 The first cilia are longer than the rest, the extreme 

 cilium being the longest. 



III. Tintinnus Cothurnia. — In the pools, on fila- 

 mentous alga?, below the castle rock at Hastings, 

 and still more abundantly in abroad ditch of brackish 

 water which extends for some distance parallel 

 with the road leading from St. Leonards to Bexhill, 

 this Baltic species of Tintinnus was discovered. 

 "Hyaline, with a cylindrical hyaline indistinctly 

 annulatcd sheath, rather attenuated and truncated 

 at the posterior end," is Pritchard's brief, and (with 

 the exception of the annulation, which I have alto- 

 gether failed to observe) sufficient specific descrip- 

 tion. Transparent, cup-shaped, with a patulous 

 mouth, surrounded by rather long cilia, a flexible 

 pedicle attaches it to one side of the sheath, 



rather more than halfway down, and to this point 

 of attachment, closing its ciliary wreath, it retreats 

 when alarmed, or on occasions of greater disturbance, 

 much below or quite to the bottom of the lorica. 

 It may be presumed that this retraction is effected 



Fig. 117. Tintinnus cothurnia x 380. 



by a muscular band, as in Yorticella, but such band 

 has not been observed. In extension, the cilia 

 aone project beyond the sheath, and are plied with 



Fig. 118. Anurwa lieptodon x 380. 



great vigour, the vortex created being proportion- 

 ably extensive. With the available magnifying 

 power (a quarter-inch), nothing beyond one or two 



