OF ARTS AND SCIENCES. 281 



27. Htpnum erectiusculum (sp. nov.) : dioicum, subprostratum ; 

 caule vage diviso ramuloso compi'esso ; foliis deorsum falcatis late 

 ovato-lanceolatis acuminatis apice serrulatis dense lineari-areolatis, 

 costellis subnullis ; capsula gracili cylindracea erectiuscula annulata ; 

 operculo conico obtuso. 



Hakodadi, Japan. 



28. Htpnum Rodgersianum (sp. nov.) : dioicum, majusculum ; 

 caule assurgente simplici vel semel diviso regulariter pinnato-ramuloso ; 

 foliis oblongo-lanceolatis acuminatis deorsum falcatis serrulatis ecostatis 

 tenui-areolatis ; capsula oblonga breviuscula turgida gibboso-incurva, 

 sicca estriata ; operculo obtuse conico. 



On the ground, shady mountain sides, Katonasiraa, between the 

 proper Loo Choo group and Japan. 



29. Htpnum eximium (sp. nov.) : monoicum, exiguum, prostratum, 

 pinnato-ramulosum ; foliis laxis bifariis oblongis ovato-oblongisve acutis 

 ecostatis superne serratis laxius elongato-areolatis ; capsula gibboso- 

 oblonga turgida incurva subhorizontali annulata ; operculo convexo- 

 conico. 



On decayed wood, mountain-sides, Bonin Islands. 



30. Htpnum subalbidum (sp. nov.) : monoicum, exiguum, pros- 

 tratum, vage subpinnatim ramulosum ; foliis compressis divergentibus 

 oblongo-lanceolatis tenuiter acuminatis integerrimis ecostatis lineari- 

 areolatis ; capsula subovali vix curvula horizontali exannulata ; oper- 

 culo conico brevirostrato. 



On damp decayed wood, Simoda, Japan ; also Bonin Islands. 



31. Htpnum Smallii (sp. nov.) : dioicum, exiguum ; caule pros- 

 trato subpinnatim ramuloso ; foliis subcompresse imbricatis erecto- 

 patentibus lanceolatis longe acuminatis ecostatis obsolete serrulatis, 

 cellulis compactis angustissimis ; capsula elongato-elliptico-oblonga hori- 

 zontali pendulave ; operculo conico rostrato. 



On decayed logs, shaded hill-sides, Ousima ; also Bonin Islands. 



32. Htpnum Ometepense (sp. nov.) : monoicum, laxe csespitosum ; 

 caule tenui repente ; ramis arcuato-erectis fasciculato-ramulosis ; foliis 

 lanceolatis acuminatis patentibus superne serratis, cellulis linearibus, 

 costellis binis brevissimis ; capsula in pedicello elongate obovato-oblonga 

 macrostoma subpendula ; operculo e basi conica tenuiter brevi-rostrato. 



On bushes, summit of a mountain on the Island of Ometepe, in 

 Lake Nicaragua. 



VOL. IV. 36 



