Systematik. 413 



valves, which are more or loss constricted in N. Weissflogii, are straight in N. Gründleri 

 Ciimpeche Bay Grundier, Colon K. 



Trijhlionella Lanceola Gr. V. lauceolate, costae streng, pervious 10 in .01 mm. 

 St. Thomas. 



Denticula? Antillarnm Gl. et Gr. V. lanceolate with acute ends. Costae 7—12. 

 Spaces between the costae with irregiilaily scattered piincta L. .05—0.63 mm. St. Bartho- 

 lomew, Santos Brazil. Nach Kitton zu Trachysplienia Petit gehörig. 



Grammatojyhora (macüenta var'i) caribaea Cl. V. with distinctly gibbous centre 

 and ends. Septa straight. Striae tine 28 in .01 mm., distinctly punctate. Virgin Island. 



Triceratium Cami^echianum Gr. V. polygonal (8—10 angles), processes on the 

 altornate angles, cellules hexagonal usually largest at the centre, diameter .062— .155 mm. 

 Campeche Bay, Gr. Colon, Barbadoes K. 



T. (or BiddnlphiaJ bicorve Cl. V. rhombic, two of the opposite angles much pro- 

 duced upon which the processes ar situated, the other angles being without them. Cellules 

 irregnlarly hexagonal. Margins striate; conuecting membrane fincly punctate. Distance 

 between the angles .059 mm. St. Bartholomew. 



Nitzschia Graffei Gr. V. broad, with cuneate and rounded ends, almost parallel 

 sides, stightly constricted at the centre. Striae strong, 10 in .01 mm., moniliform ; marginal 

 puncta 5 in .01 mm. L. .127 — .14 mm. Barbadoes Gr. Samoa, Port Jackson, Jamaica, 

 Bahia, Pisagua K. 



Biddulphia memhranaeca Cl. V. elliptic, with rounded ends. F. V. quadrangular. 

 V. very large and membranaceous. The markiugs consist of very small cellules, arranged 

 in lines crossing each other in three directions; the lines are about 8 in .01 mm., parallel 

 on the middle of the valve, but sowewhat radiant near the ends. The connecting mem- 

 brane is covered by elongated puncta, arranged in lines sowewhat coarser than those of 

 the valve. L. .26, B. .085 mm. Barbadoes. Honolulu K. (a variety of B. hnlaenal). 



Actinocyclus tenuissimus Cl. V. circular with a row of marginal puncta; marginal 

 nodule distinct. Sculpture very delicate granules arranged in lines, radiating from the 

 centre. Diam .04— .08 mm. 



Amphiprora'i comiüexa stellt Cleve zu AmpMtrite Castrac, nach Kitton ist es jedoch 

 eine Palmeria. Im schwedischen Original sind auch Abbildungen gegeben. 

 27. Reinsch. Algae aquae dulcis insulae Kerguelensis. (No. 40.) 



Als neu sind beschrieben (vgl. Journ. Linn. Soc. XV, p. 205): 

 Campylodiscus n. sp. magnus, elliptico-ovalis, utroque polo rotundato obtuso, 

 costia marginalibus radialibus crassis usque ad tertiam partem latitudinis superficieis se 

 pertiuentibus in quoque latere 22 — 24, arcolas 21 — 22 rectangulares includentibus, area 

 media laevi; frustulae a latere visao simpliciter spiraliter cuivatae areolis 21—22 rectan- 

 gularibus instructae. Diam. long. 0.132 mm., transv. 0.0666 mm. Costae 3 in 0.02 mm. 



Amphiprora n. sp. parva, rectangularis, subtilissime striata, medio parum con- 

 Btricta, utroque polo late truncato- rotundato, lineis intermediis duabus in medio cellulae 

 aequaliter extrorsum curvatis aream mediam cruciformem laevem circumcingentibus, nodulo 

 singulo et in quoque latere cellulae in decussi linoarum incluso et in summo utriusque 

 lineae. Long. 0.333 mm., lat. 0.0084 mm. 



Navicula sp. Cellulis lanceolatis apicibus capituliformibus porrectis, nodulo centrali 

 et linea media indistincta, marginibus distincte striatis striis ad mediam non pertiuentibus. 

 Long. 0.0278 mm., lat. 0.0056 mm. 



Pmnulariae sp. Cellulis ovato-cUipticis, polis rotundatis, nodulo centrali firmo, 

 Btriis transvcrsalibus distinctis lineam mediam attingentibus. Long. 0.0168—0.0196 mm., 

 lat. 0.0084 mm. 



Pinnularia sp. CcUulis late ovato-ellipticis, polis subito angustatis apicilius rotun- 

 datis, nodulo centrali firmo striis transvcrsalibus distinctis lineam mediam attingentibus. 

 Long. 0.0224 mm., lat. 0.0112 mm. 

 28. Leuduger-Fortmorel. Catalogue des Diatomees marines etc. (No. 25.) 



At)n>hi>ra briocensia n. sp. Diagnose Ann. Soc. beige de microscopie 1876. 



