372 CONTRIBUTIONS FROM iiil NATIONAL HERBARIUM. 



open i" question; for aside from its mode of growth, which may be neglected, it off en 

 ill distinction in having its raphe stop short of the apices of the Erustule and in 

 its terminations being peculiarly bent. But these qualities are very inconstant, 

 and by an examination of many species it is made certain that no distinction is possible 

 • ii n and the members of the genus Cocconema. Syncyclia Ehrenb. i- even 

 strikingly dissimilar in its mode of growth, the frustules being embedded in 

 gelatinous masses a n< I grouping themselves therein by division into cylindrical com- 

 munities, whence the name. So far as the figures are concerned, they also sho* some 

 dissimilarity from the present genus in their strongly truncate ends, but this huh 

 be Looked upon as of little significance when \\«- compare them with the drawings of 

 the «-\ ident Cocconema 6 in Pritchard. Ii is, ther< fore, beet to ignore in 1 1 1 <■ - for 

 fi >ur genera their <li fferences of attachment and unite them in a single genus. 

 Cocconema inaequale Bhrenb. Mann. 



\ icula inaequalis Bhrenb. Ber. Akad. Wise. Berl. 1836: 53. I s ',:. nom. nud.; 



Infus. 184. pl. L838. 



Cymbella i Km/. Bacill. ::•. pl. 6.J. 11. 1844. Pritch. Hist. Infus. ed. i. 



pl. 9.f. 154A. 1861. Schmidt, Atlas pi. 9.f. 6-9, 16-18, pi. 71. f. 

 Griff, a II. in". Micr. Dict.ed.3. pl. IS.J.S1. L875. W . Smith, Synop. 

 Brit. hi.. i. 1: 17. pi. .'./. //. L853. Van Heur. Synop. 60. pi. :./. i \. L881. II. L. 

 Smith,' Sp. huit. Typ. no. 117. L874. Brun, Diat Alp. 59. pi :.J. SO. L880. 

 Cleve, Sv. Vet. Akad. Hand!. 26-' : L65. L894. De Toni, Syll. Alg. 2: 349. L891. 

 Wolle, Diat. N. A. pl. ;../'. •;. //. 15. L890. 

 StauroneU inaequalis Ehrenb. Mikrog. pi 16. If. 6. L854. 

 Pinnularia inaequalis Ehrenb. Mikrog. pi. /'• // / 6. L854. 

 Cymbella delicata Schmidt, Atlas pi 9.f. /:. L875. 



Kutzing recognizes the identity "i" his form ami Ehrenberg's Vavicula inaequalit, 

 Ii i- possible Stauroneis inaequalis Ehrenb. and Pinnularia inaequalis Bhrenb. can !><• 

 assigned t" ~"in<' other speci< - as well a- t" tin-, a- their exact character is rather bard 

 to determine. But they agree fairly well with ilii.- species; ami it is probable Ehren- 

 berg Looks u|><ni them a- the same, as he uses the three generic names interchangeably. 

 In fact, the name Stauroneis Bhrenb. c is probably a misprint, for the form shows no 

 trace of a stauros. 



Pound at Btation 3013H, Hawaiian [slands. 

 Cocconema kamtschatica (Grun. Mann. 



Cymbella kamtschatica Grun.; Schmidt, Atlas pi. 10. f. SI. L875. Wolle, Diat. N. A. 



pl. ;./. 11. L890. Moll, types 3, 2, 10. 

 Cleve** makes this a variety of Cocconema mexicanurn Ehrenb. < De Toni, /on the 

 other hand, places it a- a variety of Cymbella gastroides kiiiz. Both of these resemble 

 the above. In fact, few Bpecies "i" this L r < qus have haul and fast boundaries; and we" 

 might add i<> ih<-al>"\<- resembling forms ( 'ymbella maculata Kiitz., especially as figured 

 by Van Heurck.0 I. however, flunk that Grunow's form, <>n account of it- smaller 

 size than in the above, it- finer markings, its blunt apices, and its breadth at the middle 

 of tin- \ al\ <■. together with its tumid outline on the ventral ride, can !»<■ safely left in a 

 - by itself. 

 Found ai station l' ss _. off < Oregon. 



oCf. Pritch. Bist. Infus. ed. I. pl. :../'. 5S. L861. 

 b Pritch <>|.. cit. pl. i :. ./'• 18 10. 

 > Ehrenb. Mikrog. pl. 16 I J 6. L854 

 *Sv. Vet Akad. Bandi.26: 177. 1894. 



< Cf. Ber Akad. Wiss. Berl. 1844: 342. L845. Ehrenb. Mikrog. pl SS, VII ./ <■ 

 L854. Schmidt, Atlas pl. 10. j l.f.l L875 Bl 



/ I).- Toni, Syll. Ug. 2: 362. L891. 

 eSynop. pl. ' ./ 16 L881. 



