212 



uniserialibus, basi nudis, supra medium phimosis constans, decidua, 

 inaequalis; nempe setis 5 corollam subaequantibus, et 5 alternanti- 

 bus iisdem dimidio brevioribus. Herba annua, (biennisve ?) gla- 

 bra, acaulis, foliis radicalibus linearibus pinnatifidis, lobis brevibus, 

 hinc inde mucronato-denticulatis. Scapi simplices, nudi, spitha- 

 maei, monocephali, foliis multo longiores. Capitulum unciale. Flo- 

 res lutei : pappus niveus. 



Species A. Acaulis. Torrey 8f Gray. 

 Pyrrocoma foliosa. Torr. fy Gr. Humilis, e radice crassa 

 perpendiculari multicaulis, glabrata ; caulibus confertim foliosis ; 

 foliis oblongo-lanceolatis (1-2-uncialibus,) integerrimis, mucronato- 

 cuspidatis ; summis in squamas involucri lanceolatas, acuminatas, 

 mucronato-setigeras, sensim transeuntibus ; ligulis numerosis ex- 

 sertis; corolla fl. discipappo aequilonga. Oregon. 



Aplopappus tortifolius. Torr. Sf Gr. Fructiculosus, lana 

 decidua tectus et pube brevissima scabridus ; ramis inferne foliosis, 

 apicein peduncuium longum nudum monocephalum productis ; foliis 

 coriaceis semi-amplexicaulibus, elongato-lanceolotis, spinuloso-den- 

 tatis lobatisve, undulatis, vario modo tortis ; squamis involucri hem- 

 ispheric! subulato-lanceolatis, imbricatis, granuloso-scabridis, ex- 

 timis tomentoso-canescentibus ; ligulis (ut videtur flavis) 30-40 lin- 

 earibus, praelongis ; pappo rufescente ; acheniis sericeo-villosis. 

 Upper California. 



Actinella grandiflora. Torr. Sf Gr. Depressa, villoso-to- 

 mentosa ; caulibus numerosis e caudice crassa, simplicibus (4-5 

 uncialibus,) sparsim foliatis, monocephalis ; foliis radicalibus pin- 

 nato-partitis demum glabratis, segmentis linearibus integerrimis 

 vel 2-3 fidis, caulinis supremis linearibus fere integris ; squamis in- 

 volucri valde lanati biseriatis, linearibus, aequalibus, pappi paleis 

 circ. 6, augusto-lanceolatis, acuminatis, corollam disci subaequanti- 

 bus. Capitulum ratione pi. magnum, eaque Gaillardiae aristatse 

 emulans. Rocky Mountains. 



Dr. Gould called the attention of the Society to a speci- 

 men of lime-stone, from Lake f^rie, containing numerous 

 conical masses, whose nature and origin have not been 

 made out satisfactorily. He pointed out their resemblance 

 to recent Balani, of the genus Conia. The resemblance in 

 form and strise, and mode of aggregation, was striking, 



