OF THE LICMOPHOKE.E. 



71 



and more lax, and witliout radiant frus- 

 tules. 



K. oceanica (K.). — Friistules oblong 

 cuneate, dense ; stipes elongated, slender, 

 subdichotomous. KB. t. 10. f. 4. At- 

 lantic. iS flabellate. 1-390". Internal 

 matter fulvous. 



R. superha (K.). — Frustules geminate 

 or solitary, oblong cuneate, slightly acute 

 at their base ; stipes long, filiform, di- 

 ehotomous, secondary branches lateral, 

 short. KB. t. 10. I 7. Europe. 1-310". 

 Elegant, slender, large ; internal matter 

 golden-yellow, globose, broadly distri- 

 buted. 



R. gmndis (K.). — Frustules broadly 

 cuneate, large; stipes very long, fili- 

 form, dichotomous. KB. 1. 11. f. 1. ^. 

 orachnoidea (K.). — Frustules caducous, 



mostly lateral. Venice. Large, its in- 

 ternal matter granular, globose, olive. 

 1-120". 



E. Meneghinimia (K.). — Large; frus-- 

 tules geminate, oblong cuneate, with 

 rather broad apices 5 stipes much elon- 

 gated, filiform, dichotomous. KB. t. 11. 

 f. 2. Venice, (xm. 19.) 1-288". In- 

 ternal matter scattered, globose, olive- 

 brown. 



R. Craticula (IVIont.). — Shortly stalked, 

 subflabellate, dilated at the base, cra- 

 ticuliform ; frustules two to six, lanceo- 

 late or oblong-lanceolate, with truncate 

 apex, and obtuse, scarcely attenuated 

 base. Montague, A d Sci Nat. 1850, 

 p. 308. Cayenne. 1-650" to 1-450". 

 Stipes slender. 



Geniis LICMOPHORA(A.). — Frustules flabeUiform, stipitate, in front 

 view narrow- cuneate, laterally clavate ; stipes thick, irregularly branched. 

 Licmoi)hora is nearly identical with EchineUa of Ehrenberg. '' The finis- 

 tules of the present genus differ in no essential respect from those of Rhipi- 

 dophora. They are, it is true, longer and narrower, and probably less firml}^ 

 silicious ; but none of these circumstances seem to be of generic importance. 

 The separation of the genera must therefore rest upon the fan-like arrange- 

 ment of the frustules upon the summit of an incrassate and irregularly 

 dichotomous pedicel which occui^s in Licmophora." (S I. c. vol. i. p. 85.) 



Meneghini, however, says that " the resemblance of this to the preceding 

 genus is only apparent. But a true affinity connects Licmophora to Synedra, 



from which it differs only in its cuneate frustules The vittae in 



Licmophora are not to be compared with those in Rhipidoj)hora. They are 

 nothing more than the usual longitudinal canals projecting into the cavity, 

 by which the apparent perforations or sections of their ca\*ities appear very 

 near the margin of the summit. The distribution of the internal coloured 

 substance is different from that in the two preceding genera, and greatly 

 resembles that of Synedi^a." (M Z. c. p. 464.) 



Licmophora 



splendida (Grev.). — 

 "Frustules nearly linear, frequently at- 

 tenuate and roimded at the upper extre- 

 mity; in lateral ^dew attenuate towards 

 the upper end." SB. i. p. 85, pi. 32. 

 12S3. =L.fabelIata, K. ; EchineUa splen- 

 dida, E. Europe. Differs from the next 

 species by its longer and nan'ower frus- 

 tules, many of which are scattered and 

 lateral. 



1^. Jlahellata (Grev., Ag.). — Frustules 

 cuneate, ti-uncate ; in lateral ^-iew very 

 narrow clavate. S. pi. 32. f 233. =X. ra- 

 dians, K. ; L. argentescens, Ag. ; EchineUa 

 flaheUata, E. Common. (iv. 9. ; x. 

 '191-193.) 



" I have given, in accordance with the 

 authority of my predecessors, two species 

 of this genus ; but I am far from satisfied 

 that they are truly distinct, and I am 



disposed to believe that a wider com- 

 parison of specimens wUl necessitate 

 their miion." (SB. i. p. 85.) Being unable 

 to determine the s^Tionjmis of Agardh, 

 Ehrenberg, andKiitzing, we have thought 

 it better to foUow Professor Smith than 

 to risk increasing the confusion which 

 exists. The Licmophora argentescens, 

 Ag., is remarkable for its silvery lustre 

 when dried ; but we cannot detect any 

 valid diagnostic difference. Both species 

 are remarkable for the X^a^g^ and beau- 

 tiful fan-like clusters of frustules termi- 

 nating their branches; other frustules 

 are lateral and scattered. 



L. Meneghiniana (K.). — Frustules 

 sleader, very long, linear cuneate, ter- 

 minal ones radiant, lateral ones scat- 



tered 

 KSA. 



stipes 

 p. 113. 



elongated, subdivided. 

 Adriatic Sea. Leng-th 

 3d2 



