Baclllarieae, PlagiogrammaceEn, Plagiogramraa. '"719 



simile sed haud ita profunde constrictum nec non costis termi- 

 nalibus carens, 



4. Plaglogramma Robertsianum Grev. in Trans. Micr. Soc. 1863, p. 13, 290i 

 t. 1, f. 1-2. — Valvis lanceolatis, 45-75 [Jl. longis, obtusis, co- 

 stis transversis duabus centralibus; striis subtilissimis circ. 12 in 



10 a. 



Hab. ad a Port Stephen, New South Wales » (Dr. Roberts). 

 — Frustula e facie connectivali conspecta quadrangularia, medio 

 tumidula, apicibus subdilatata, quasi tricrenulata. 



5. Plagiogramma tahitiense Castrac. Diat. Challenger p. 45, t. 19, 2902 

 f. 4, Notarisia 1889, p. 690. — Frustulis rectangularibus, 29-30 :; 

 11,5, snbinflatis ; vittis duabus centralibus perviis; striis transversis 

 tenuioribus ad extremum usque. 



Hab. in portu Tahitiensi (Exped. Challenger). — Diraensiones 

 ex icone erui. Plagiogramma ja?natcense Grev. in meraoriam 

 revocat. 



6. Plagiogramma? tessellatum Grev. in Micr. Journ. 1859, p. 208, 2903 

 t. 10, f. 7. Pritch. Inf. p. 774, Grun. in Wien. Verhandl. 1862, 



p. 359. — Valvis magnis, ad 100 u.. longis, auguste ellipticis, pseu- 

 " donodulis terminalibus magnis, pseudonodulo (?) centrali ecostato, 

 valvae latitudinem percurrente, pseudorhaphe nulla; valvis seriebus 

 (3 in 10 a.) punctorum raajusculorum quadratorum ornatis. 



Hab. in guano Californiae (Greville); vivum in aquis marinis 

 ad (( Labuan )) insulae «Borneo» (Kjellman, Cleve); inter «Aden 

 et Bab-el-Mandeb» (Cleve). 



7. Plagiogramma margaritaceum Castrac. Diat. Challenger p. 45, t. 19, 2904 

 f. 13, Notarisia 1889, p. 690. — Valvis late ellipticis, 45-46 ^21-22, 

 convexiusculis; granulis inter medias costas nullis, ad apices eva- 

 nescentibus. 



Hab. in portu Tahitiensi (P^xped. Challenger). — Diraensiones 

 ex icone erui. 



8. Plagiogramma barbadense Grev. in Trans. Micr. Soc. 1865, p. 1, 2905 

 t. 1, f. 3. — Valvis angustis, elongatis, 86-88 a. longis, medio con- 

 strictis, dein dilatatis et demum in apices lineares subacutos con- 

 tractis; costis duabus robustis, centralibus; superficie lineas longi- 

 tudinales et transversale subtilissimas et series striarum pervia- 

 rum, transversalium, tenuium pr?ebente. 



Hab. fossile in depositu barbadensi « Cambridge Estate», raris- 

 sime (C. Johnson), — Plagiogr. lyraio Grev. proximura. 



9. Plagiogramma spinosum Cleve On some new or little known 2906 



