Naoiculacca.] inffsobial animalctjles. 461 



whicli they were originally placed by Agardh, wlio constituted tliat 

 genus. 



EciimELLA. Jlahellata {Exilaria, Greville). — Smooth and shrub-like ; 

 lorica in the form of a truncated elongated wedge, obtusely tridentate, 

 and longitudinally striated. They are attached by the smaller ends to 

 a thick and long stalk, and disposed in a fan-like group. It covers 

 various marine plants or Algaj, as shown (of the real size) in fig. 191 ; 

 and is of a golden coloiu-. The thick tender gelatinous branched 

 stalks resemble those of Vorticella. (See the tree-like group 192.) 

 The stem is an excretion produced by the animalcule, probably like 

 the shells of the Mollusca, like which, too, it is devoid of organic or 

 vital power, and if the fan-shaped bodies separate from it, it evolves 

 no new bodies in the form of gemmae, but disappears. Group 193 

 shows a dorsal and lateral \T.ew of a single animalcule. Length 

 without stidk, l-120th; height of tree, 1-1 2th to l-6th. On the 

 shores of England, France, &c. 



E. spUndida. — Smooth and branched ; lorica rather straight or 

 club-shaped, slender, with rounded capitate ends ; dispersed or 

 arranged in fan-like clusters, at the swoUen extremities of the branches 

 of a long stem. Length 1 -570th; height of tree (frond) l-140th. 



E. Q) paradoxa ^= Rhi2)idophora 2}(i>radoxa (Kiitz.) — Smooth and 

 branched ; lorica broadly wedge, or heart-shaped, tridentate and 

 truncate. Pound solitaiy, or mostly in fan-like clusters, upon a 

 slender, filiform, dicbotomous stem. Length 1 -570th to 1 -480th. 

 In salt water, North Sea and Adiiatic. 



E. capitata = Synedra Ehrcjibergii (Kiitz.) — Smooth, stalked, 

 lorica linear, capitate, never wedge-shaped, developed in fan-like 

 clusters, attached to Ilottonia palustris. Stipes simple, not branched. 

 Length 1-1 150th to l-570th; height of frond l-280th. 



E. (?) abhreviata. — Smooth; stipes short and unbranched ; lorica 

 cuneate, obtusely tridentate, developed in fan-like clusters. In spring 

 water. Length 1-1 150th to l-860th. 



E. fulgens. — Stiiated ; pedicle short, unbranched ; lorica linear, 

 truncate at both ends, not cuneate. In salt water. Length l-70th. 



Genus Gomphoneiia. TJie loedge-sluiped tree-like Bacillaria. — Lorica 

 simple, cuneate, fi^ed upon a distinct filifoim p3dicle ; dcvelopcs by 

 spontaneous self- division, in the form of a dichotomous little tree. 



