726 Bacillariere, Plagiogrammacefp, Plagiogratnma. 



membrana connectivali seriebus punctoruni {o^f^-Q in 10 [i.) lon- 

 gitudinalibus ornata, costis 4. 



Uab. \\\ Giiaao Californise (Greville). 



Seetio IIL Valvae costis duabus centralibus aliisque nuraero indetermi- 

 natis remotis instructse. 



38. Plagiogramma californicum Grev. in Micr, Journ. 1859, p. 211, 2935 

 * i. \ d. f. 15-17, Pritch. Inf. p. 774, Grun. in Wien. Verhandl. 



1862, p. 360. — Valvis iiueiribus, 75-90 y.. longis, apicibus rotun- 

 datis, inter cenlrum et apices costas 3-5 praebentibus, pseudorhaphe 

 distincta, striis 7 in 10 y.. 



Hab. in guano Californiae (Greville). 



39. Plaglogramma spectabile Grev. Diat. fr. South Pacif. I, p. 536, 2931 

 t. XIII, f. 7. — Vaivis medio constrictis, 70-72 a. longis, dilata- 

 tis leniterque lyraeformibus, vittis numerosis (circiter 12), lineis 

 transversis e punctis minutissimis compositis interpositis. 



Hab. ad oras Novae Caledonise, rarissime (Roberts). 



40. Piagiogramma polygibbum Cleve et Grove in Diatomiste 1891, 293' 

 p. 56, t. 8, f. 7-11, Plagiogramma spectabile var. quadrigib- 

 bum Grun. Alg. Novara p. 95, t. 1, f. 26, Plagiogramma qua- 

 drigibbum Leiid.-Fortm. Diat. Ceyl. p. 52, t. 9, f. 90, Plagio- 

 gramma hexagibbum Leud.-Fortm. Diat, Ceyl. p. 52, t. 9, f. 91. — 

 Frustulis e facie connectivali visis linearibus, lineas 2 sutura- 

 les undulatas subtiliter punctatas ostendentibus; vaivis angustis, 

 50-220 »16, apicibus rotundatis, medio contractis, dein pluries (us- 

 que ad 5-ies) inter medium apicesque constrictulis et hic ad 8 



. a. latis ; area centrali pseudostaurum praibente, costis transversis 

 definita annulumque ellipticum centro ostendente, area longitudinali 

 (pseudorhaphe) tantum prope staurum visibili, angusta, areis ter- 

 tninalibus hyalinis costisque transversis liraitatis; superficie tota 

 valva3 costis transversis robustis plus minus numerosis , irregu- 

 iariter dispositis percursa. 



Hab. in «Polycystineen-Gestein» ex insula nicobarica « Nan- 

 koori» (Grunow); in freto «Macassar» (Cleve, Grove); in mari 

 ad ((ColomboD insul^e Ceylonae (Craven, Leuduger-Fortmorel). 

 — Structura: series granulorum margaritaceorum in lineas trans- 

 versas et iongitudinales dispositorum, 10 in 10 u.. et pra^cipue 

 versus margines valvie spinulis numerosis commixtorum. Margines 

 valva? spinis obsiti. 



41. Plagiogramma crassum Cleve et Grove in Diatomiste 1891, p. 54, 293? 



