19 



lanceoIatis_ setts ex angtilo extremo exeuntibns radice brevis- 

 sime concretis, divergentihus, setis terminalihæ crassis, a<J- 

 niodum rectis, aciite sp/inihsis, angulo acido divergentihus, 

 sporanm ralris subaeqnaJiter .«pinosis, primaria in margine 

 inferiore acnJeis aequihmgis pardlelis coronata. 

 Japan (Jeddo Bay). 



12. Cliætoceros Schiittii, Cl. (1894) p. 14. T. I. fig. I. 



rig. Schiitt (l^iSS) T. IIL fig-. II. HI. 

 Tab uostr. II, fig'. 10, 20. 

 Syn. Cli. procernm, Schiitt (lSy.'i) p. 38, fig. ?, a, 6 (?) 

 Kjederne rette, 9 — 22 ii brede. 



Cellerne i frontstilling rektangulære med skarpe lijor- 

 ner, skallerne noget konkave med en svag livælvning paa 

 midten, foramina bredt spalteformede, indsnevrede paa mid- 

 ten. Baand meget lavt cylindrisk. mindre end '/i af celle- 

 længden. 



Kromatofor 1 i liver celle, frontstillet. 

 Hornene rette, udgaar fra skallernes hjørner og kryd- 

 ses lige ved udgangspunktet, divergerer en spids vinkel og 

 afbøies lidet eller intet naod filamentets ender. 



Teiminalhorn divergerende en stump vinkel, sterke, 

 fortykkede paa midten, svagt snoede med en aaben spiral 

 af forhoiede punkter, ofte sterkt lioiede i longitudinal ret- 

 ning lidt udenfor midten. 



Sporerne midt i modercellerne, primærskallen Iniefor- 

 niig livælvet med korte, sterkt divergerende torne paa næsten 

 hele tladeii, sekundærskallen puklet med længere, svagt 

 divergerende torne kun paa den midtre del. 



Vegetationstid. August — November, med sporer. 



Forekomst . Ekersund og Christianiafjorden november 

 93 (Hjort), Drobak august (frk. Bonnevie) og september 96. 



Udbredelse. Skagerak, Kattegat, Østersoen. 

 CJi. Schiittii er meget nær beslegtet med CJt. a/fine, 

 fjaudor. fra hvilken den maaske vanskelig kan skilles. 



13. Cliætoceros Willei, n. sp. 



Tal.. IV. tig. IT. 



Kjederne rette, bredde lU — 20 (/. 



Cellerne i frontstilling rektangulære-kvadratiske med 

 skarpe hjørner, skallerne næsten plane, foramina linjefor- 

 mede. svagt indsnorede paa midten. Baandcylinderen for- 

 længet, soramene utydelige. 



Chromatofor 1, frontstillet. 



Hornene tynde, rette, udgaaende fra skallernes hjørner 

 og krydsende hverandre ved udgangspunkterne, divergerende 

 en spids vinkel, svagt eller slet ikke afbøiede mod filamen- 

 tets ender. Terminalhorn kortere, svagt fortykkede paa 

 midten, divergerende i en spids vinkel. 



Hvilesporer ukjendte. 



lanceolatis, setis ex angulo extremo exeuntibus radice brevis- 

 sime concretis, divergentibus, setis terminalibns C7'assis, ad- 

 modum rectis, acute spimdosis, angulo acuto divergentihus, 

 sporaruni valvis subæqualiter spinosis, j^riniaria in margine 

 inferiore aculeis æquilongis parallelis coronata. 

 Japan (Jeddo Bay). 



12. Chætoceros Schiittii, (1. (ISiU) p. 14. Pl. I, fig. 1. 



Fig. Schiitt (1888) Pl. III, fig. II. III. 



Pl. II, figs. H), 20. 



Syn. Ch procerum, Schutt (18!).-.) p. 38. fig. 3 a. 6(?) 



Filaments straight, 9 — 22 /< vide. 



Cells, in a front view, rectangular with sharp angles, 

 valves somewhat concave with a slight convexity in the 

 middle; foramina l)i-();idly liiu-ar. iiarrowed in the middlc. 

 Hoop very short cylindrical. less tluui ' ., of the lengtli of 

 the cell. 



Chroiiiat(ii)hores, one in eacii cell, situated in front. 



Setæ straight, issning from the corners of the valves, 

 and Crossing one another closs to the point of issue: they 

 diverge at an acute angle, and are little, if at all turued 

 off towards the ends of the filament. 



Terminal setæ diverging at an obtuse angle, strong, 

 thickening in the middle, sligthly t\visted with an open spiral 

 of raised puncta, often niuch curved in a longitudinal direc- 

 tiou a little beyond tiie middle. 



S])ores in the middle of tlie jiarent cells, primary 

 valve areuate with short, sharply-diverging spines over 

 nearly the whole surface ; secondary valve humped. with 

 longer, slightly-diverging spines only in the middle. 



Period of Vegetaiion. From August to November 

 with spores. 



Occurrence. Ekersund and Christiania Fjord, Nov. 

 1893 (Hjort): Drobak, Aug. (Miss Bonnede) and Sept. 

 1896. 



Distrihufion. Skagerak. Kattegat, Baltic. 



Cii. Sciiiiffii is very nearly allied to Cli. ajfine. Lau- 

 der, from whicli it may perhaps be difficult to distinguish it. 



13. Chætoceros Willei. n sp 



Pl. l\. lig. 17. 



Filaments straiglit, lU — 2(i /( broad. 



Cells. in a front view. rectangular to square. with 

 sharp angles, valves almost tlat, foramina linear, slightly 

 constricted in the middle. Hoop cylinder long, sutures 

 indistinct. 



Chromatophore, 1. iii front. 



Setæ thin, straight, issning from the angles of the 

 valves, and crossing eacli otlier at their insertion, diverging 

 at an acute angle, only slightly, if at all curved towards 

 the ends of the filament. Terminal setæ shorter. slightly 

 thickened in the middle, diverging at an acute angle. 



Spores unknown. 



3* 



