PROCEEDINGS OF SOCIETIES. 287 



appertaining to this species {If.Jlmiriata), and it would almost 

 appear as if these may have been possibly overlooked by previous 

 observers, so identical was the form in other respects with the 

 figures alluded to. A few common species are occasionally found, 

 however, both with and without certain spines, but in regard to 

 which their identity was beyond any doubt. This does not ap- 

 pear to be the plant referred to in ' Hedwigia,' 1866, pp. 58, 59, 

 under the name of M. fimbriata, var, ornata, Bulnheim, where it 

 is stated that the entire surface is covered by very many spines, 

 and the ultimate divisions of the lobes pass over quite gradually 

 into the spines, without becoming previously rounded off", and 

 that, therefore, the most suitable name would appear to be M. 

 aculeata ; but whether this is a new species or an equivalent to 

 AT. aculeata, Ehr., as it possibly is (and which is appareutly the 

 same as M. apiculata) , does not appear. 



Mr. Archer exhibited fine and numerous specimens of a minute 

 organism, which appeared to him to appertain to the genus Dino- 

 bryou, and to be an uudescribed form. This is a rather rare pro- 

 duction in our moor pools, and from its generally hyaline character 

 and its minuteness somewhat readily overlooked. That which 

 first strikes the eye is a cluster, occasionally rather dense, of 

 cylindrical (sometimes, when very crowded, somewhat bent), very 

 slender hyaline tubes, disposed in a radiant manner. Each of 

 these tubes is inhabited by a minute monad-like green organism, 

 like that of Dinohryon sertularia, but, of course, a good deal nar^ 

 rower and more minute, as the tube in which it dwells is in itself 

 so much less in diameter than the campanulate cells of that 

 species. This monad-like organism is contractile, being some- 

 times extended up to the terminal aperture of the quill-like tube, 

 and sometimes rather quickly withdrawn into it, though in large 

 clusters with long tubes, it seemed to be permanently placed near 

 the top, the lower portion of the tube being seemingly empty. 

 Very dense clusters sometimes present a rounded outline, those 

 less dense a hemispherical or a fan-shaped form, the tubes appear- 

 ing distinct to the base, though in a crowded condition, not 

 readily traceable the one from the other all the way down. It 

 would seem that this production must be referred to Dinobryon, 

 though it does not accord with any of the forms already described, 

 though, as Mr. Archer did not know any figures of them, he 

 thought it better to allow it to remain an open question for the 

 present. 



Dr. Moore exhibited hairs of a stellate and palmate form from 

 the gamosephalous orange-coloured calyx of Steriplioma para- 

 doxa, a Capparidaceous plant from Trinidad, which formed a very 

 pretty object. 



Eev. E. O'Meara showed a new Stauroneis from the Seychelles, 

 a description of which will hereafter appear. 



Mr. Crowe drew attention to a curious case of malformation in 

 Closterium striolatum, consisting in the fusion of two perfect 

 Closteria by their ends, the portion uniting them having become 



