442 Bacillariese, Cocconeidaceae, Cocconeis. 



COCCONEIS Ehrenb. [1835] Infus. pag. 193 era. Grun. [1868] Alg. 

 Novara p. 11 (Etym. coccus granuin), V. H. Syn. p. 132, De-Toni 

 Osserv. Tasson. Bacill. 1890, pag. 899. — Valv?e late ovatae, el- 

 lipticae aut disciformes, dissimiles, superior tantum pseudorhaphen 

 ostendens, inferior rhaphen genuinam nodulosque praebens. Fru- 

 stula arcuato-genuflexa, plerumque epiphytice vigentia. Phaeophora 

 ut in Achnanlhide. Auxosporse singulse e cellulis matricalibus binis 

 generatse. 



A. Valva superior transverse costata. 



1. Cocconeis pacifica Grun. Alg. Novara p. 11, t. 1, f. 10, a (valva 1800 

 inferior), b-d (valva superior), H. L. Sra. Sp. T. n. 634. — Valvis 

 25-30^15-20; valva inferiori coronula punctorura majorum sub- 

 marginalium instructa, ceterum hyalina, tenuissime striata, rhaphe 

 recta, nodulo centrali in fasciam transversalem dilatato et hinc 

 pseudostaurum efformante,- valva superiori pseudorhaphe lineari 

 angusteve lanceolata, costis validis, subradiautibus, saepe sulcis duo- 

 bus tenuibus longitudinalibus varie dispositis percursis. 



Hab. ad Macrocystiden in oris Chilensibus (Kxped. No- 

 vara). — Valva superior Rhaphoneidi scutelloidi Grun. similis. 

 Cocconeis Grantiana Grev., teste ipso Grunow, fortasse valvam 

 inferiorem speciei cujusdam affinis Cocconeidi pacificoz sistere vi- 

 detur. Cocconeidi pacifica? proximam esse sestumat clarus Grunow 

 Alg. Novara p. 9 Pinnulariam Allmanianam Greg., cui ut syn- 

 onymum dubie adscribit Cocconeis sulcata Bail. Proc. Philad. 

 Acad. 1853 (e « Pugets Sound »). Cfr. vero diagnosin Navictdce 

 Allmanianw (Greg.) Ralfs in hoc Sylloges volumine pag. 23, 

 n. 46. 



2. Cocconeis ornata Greg. Diat. of the Clyde tab. 1, f. 24, Pritch. 1801 

 Inf. p. 870, Jan. et Rabenh. Diat. Hondur. p. 7, t. 1, f. 15, Ra- 

 benh. Fl. Eur. Algar. I, p. 105. — Elliptica, 50-55*34-35, utro- 

 que polo obtuso-rotundata, quasi raarginata ; costis radiantibus, le- 

 vibus, ad raarginern interruptis, ad mediam (aream) abbreviatis ; 

 nodulo centrali valido, rhaphe polos versus evanescente. 



Hab. ad oras Scotiae (Gregory); inter Algas ex «Honduras» 

 reportatas (Kirchenpauer). 



3. Cocconeis? striata Elhr. Amer. t. 3,1, f. 30, M. c. ic. plur., Kuetz. 1802 

 Bacill. p. 73, t. 29, f. 31 (valva inferior!), Rabenh. Siissw. Diat. 



p. 27, t. III, f. 12. — E mediocribus; valva (inferiori) elliptica, 

 oblonga, striis transversis subtilibus, subconvergentibus. 



