430 [OCTOBER; 



On leave granted, Dr. Le Conte presentcdTor publication a paper by 

 Profs. W. H. Harvey and J. W. Bailey, on new species of Diatomacese, 

 collected by the U. S. Exploring Expedition ; which was referred to 

 Drs. Leidy, Le Conte, and Zantziuger. 



The Conimittee stated that the paper had already been examined and 

 was approved by them, and they accordingly reported in favor of its 

 publication in the Proceedings. 



New fipecies of DiatomacecE, collected by the United States Ex'plori7ig Expedition, 

 under the com^iiand of Capt. Wilkes, TJ. S. iV. 



By Professor W. H. Harvey and Professor J. W. Bailey. 



The species of Diatomaceae here described as new, together with the other 

 species included in the list on page 431, were detected either as parasites upon 

 Algce, or entangled in mud adhering to shells, algae, &c., brought home by the 

 Exploring Expedition under the command of Capt. Wilkes. 



1. AaiPHiTETRAS FAVOSA, -Harvey et Bailey. Loricis tabularibus ; lateribus 

 vix concavis, primario ; secundario quadrangiilo, an^ulis fere rectis vix productis, 

 superfice cellulis magnis hexagonis tessellata. TIab. Mindanao. 



2. Amphitetras WiLKESii, H. et B. ; loricis 'prismatico-tabularibus, lateri- 

 bus concavis, primario longitudinaliter striato-punctato medio transversim zo- 

 nato ; secundario quadrangulo, angulis productis rotundatis, superfjcie cellulis 

 minutis in lineas simplices furcatasque dispositis notata, prominentiis jugalibus 

 punctulatis. Hab. Puget's Sound. 



3. Aulacodjscus Oreganus, H. et B. ; lorica prominentiis tredecim intra- 

 marginalibus instructa, a quibus tot radii fere ad umbonem procurrent ; super- 

 ficie prater umbonem glaberrimum, minute punctata iridescente. Hab. Puget's 

 bound. 



4. Campylodisctjs Kutzingii, H. et B. ; sellaeformis late marginata sulcis sub- 

 quinquaginta transversis continuis curvatis impressa. Hab. Mindanao. 



5. CoccoNEis Parml'la, H. et B. ; late elliptica, linea media longitudinali 

 notata, utroque latere costis (vel sulcis) transversis magnis 10-12 irregularibus 

 impressa ; superficie transversim striato-granulata. Hab. Tahiti. 



G. CoccoNEis RHOMBiFERA, H. ct B ; late elliptica vel suborbicularis linea 

 media oblique-longitudinali sigmoidea areolam glabratam percurrenie qua? apice 

 et basi attenuata est, et versus umbonem in rhombi formam ampliata ; superficie 

 decussatim et transversim punctata. Hab. Puget's Sound. 



7. CoccoNEis SULCATA, H. ct B. ; late elliptica vel suborbicularis transversim 

 sulcata, subcis 30-40 arcuatis. Hab. Puget's Sound. 



8. Hyalosira punctata, H. et B. ; loricis magnis in catenas longas cn-ordi- 

 natis rectangulis subquadratis transversinn interrupte vittatis; vittis medio loricnp 

 alternantibus granulatis, alternis scrie punctarum insignium ornatis. Hab. 

 Tahiti. 



9. IsTHMiA MINIMA, H. et B. ; zona transversal! subtilissime decussatim punc- 

 tata, lateribus (secundariis) cellulis magnis granulata. Hab. Rio Janeiro and 

 Sooloo Sea. 



10. Triceratium concavum, H. et B. ; lorica lateribus valde concavis angulis 

 rotundatis, superficie triquetra cellulis minutis in lineas radiantes simplices fur- 

 catasque co-ordinatis notata ; prominentiis jugalibus punctulatis. Hab. Tahiti. 



11. Triceratium gibeosom, IT. et B. ; parvum, fere inflato-globosum, lateribus 

 valde convexis, angulis prominentibus, superficie ut in T. concavum notata. 

 Hab. Tahiti. 



12. Triceratium orientale, H. et B. ; magnum; lateribus convexis angulis 



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