2939.
SPHiEROZOSMA elegans.
Elegant Sphcerozosma.
CRYPTOGAMIA Alga.
Gen. Char. Frustules compressed, concatenated,
Specc. loCvheanr a. lmFosrtu tsotu tlhees cbernotardee.r than long; lobes ot the frustules oblong-elliptic; transverse surface
oblong, with a projecting gland-like process on
S either side in the centre. . vn. Sphserozosma elegans. Cord, in Aim. de Carlsbad 1835, t. 4. ƒ. 37; Observ.Micr. 21. 4. Deƒs.m 3i0d.i umH caosms.p Arelsgsauem, v. . R1.a3l4fs8 .A tn. n8. 4o. jƒ N 1a.t . Hist.
Spvh.s e9r.o 2zo5s3m. a unidentata. Ralfs Ann. o^f Njga t. Hf iistt.
Odvo. n1t6el. la1 4u.nidentata. Ehrb. Inf. 154.
P o o l s , Chyan-hal Moor near Penzance, and Towednack
Moor near St. Ives. Mr. Ralfs communicated our specimen.
It has been gathered also near Tunbridge by Mr. Jenner.
It occurs entangled amongst the leaves of aquatic plants.
Extremely gelatinous, furnished with a mucous tube, which
is however sometimes very obscure. Chains of frustules much
compressed, elliptic, deeply cloven, sometimes almost to the
centre; transverse surface of junction oblong, furnished on
eitist hneeri gsihdbeo wuirt hto a floitrtmle gthlaen gdl-olibkuel ep rvoicseibslse, wath tichhe cpoominbti noefs j uwnicth
tion. TSndochrome at first uniform with a pale line at the point
of division, at length condensed in the centre, showing in the
transverse view four linear processed, two at either extremity.
One segment of the frustule is often larger than the other.
This I believe arises from the development of two new halt-
frustules from the centre of the older ones. This is precisely
the order in which the new frustules are formed m the genus
Isthmia.—M. J. B.