724 BacillarieiB, Plagiograrnniaceae, Plagiogramma. 



insulae «Borneo» (Kjellman, Cleve); ad ins. Virginuin in Archi- 

 pelago iiidico-occidentali (Cleve); fossile in Guano (Janisch). 



28. Plagiogramma lyratum Grev. in Mici-. Journ. 1859, p. 211, t. 10, 2925 

 f. 14, Pritch. Inf. p. 775, Grun. in Wien. Verhandl. 1862, p. 360. 



— Valvis medio angustatis, ad 100 a. longis, lobis expansis quasi 

 anguste orbicularibus, apicibus rotuitdatis; striis 7 in 10 a. 



Hab. ad c. Nassau, New Providence» (Greville). 



29. Plaglogramma constrictum Grev. Diat. fr. South Pacif. I, p. 536, 9925 

 t. 13, f. 8. — Valvis circ. 60 a. longis, medio constrictulis, dein 

 abrupte dilatatis et lyriformibus, costis centralibus terrainalibusque 

 instructis; striis transversis moniliformibus, 4-4^2 '" 10 f^»? inter- 

 ruptis. 



Hab. in oris Nova; Caledonise (D. Roberts). — Flagiogram- 

 mati lyraio Grev. affine, a quo differt statura minori, valvis 

 pro ratione latioribus, constrictione magis abruptji, costis centrali- 

 bus magis approximatis striisque minus numerosis. 



30. Plagiogramma caribaeum Cleve Diatoms from the West Indian 2927 

 Archipelago p. 10, n. 78, t. III, f. 17, J. M. 1879, p. 30, t. 2, f. 17. 



— Ambitu Planiogr. iyrato simile, 88 ® 12, costis 4, duabus in 

 medio, duabus prope apices dispositis, ceutralibus cum terminalibus 

 per costam medianam robustam singulam et alias duos margini- 

 bus paralleliter dispositas conjunctis; punctis distinctis granulisve 

 in series Iransversas parallelas ordinatis, 8-9 in 10 a. 



Hab. ad ins. Virgin. archipelagi Indiae occidentalis (Cleve). 



31. Plagiogramma attenuatum Cleve Diatoms from the West Indian 2928 

 Archipelago p. 10, n. 79, t. III, f. 18, J. M. 1879, p. 30, t. 2, 



f. 18. — Parvum, 50 a. long., gradatim e medio apices versus at- 

 tenuatum ; costis duabus centralibus aniiulum subquadrangularem 

 efficientibus, costis duabus terminalibus; punctis parvis, in lineas 

 traiisversas parallelas non interruptas 10 in 10 y.. dispositis. 



Hab. ad S. BartholomaBum in archipelago Indic© occidentalis 

 (Cleve); ad insulam Ceylonam (Kjellman, Cleve). 



32. Plagiogramma decussatum Grev. in Trans. Micr. Soc. XIV, 1865, 292^ 

 p. 1, t. 1, f. 1-2. — Valvis eliiptico-oblongis, 55 a. longis, costis cen- 

 tralibus duabus striisque numerosis perviis e granulis minutis, 

 lineas decussatas efficientibus compositis, ocellis terminalibus sub- 

 trigoniis. 



Hab. e profundis ereptum ad S. Helenam (D. Wallich); in sto- 

 macho Ascidiae ad ((Shark's Bay » Australiffi occidentalis (D. 

 Macdonald),- ad ins. Virgin. Archipelagi indici occidentalis et ad 



