dliferences are expressed at the bottom of the accompanying plate, 

 where fig. 1. represents D. Pierardi, and fig. 2. I), cucullatum. 

 Whether or not the latter is really a distinct species may possibly be 

 doubted; but it is certainly so remarkable a form, as to have amply 

 justified Dr. Brown in separating it from Pierardi. 



Allied to these plants are some new species, which we avail 

 ourselves of the present opportunity of making known to Botanists. 



1. D. ochrealum (Lindl, in Wall. Cat. no. 7410) ; caulibus brevibus e squamis 

 membranaceis ventricosis erumpentibus, foliis ovato-lanceolatis acutis, vaginis 

 ventrico.sis, tloribus geininatis sepalis petalisque majoribns lanceolatis acumi- 

 natis, labello rboniboideo-ovato unguiculato cucullato intus tomentoso. 



Hab. in Chittagong, Wallich (^hab. s. sp. e Museo Anglo-Indico). 



Species vaginis laxis, alioquin facie D. Pierardi, primo intuitu distinguenda. 

 Flores expansi fere 3 uncias lati, pallidi. Labelluin purpureo-maculatum ; 

 ungue intiis supra medium calloso. 



A beautiful plant. 



2. D. Cunninghcunii ; caulibus gracilibus pendulis ramosis vaginis foliorum cor- 



nels transversim corrugatis squamatis, foliis ovato-linearibus obtusiusculis, 

 pedunculis oppositifoliis bifloris foliis multo brevioribus, sepalis ovatis acutis, 

 petalis oblongis acutis latioribus, labelli trilobi lobo intermedio subrotundo 

 undulato basi 5-lamellato lateralibus nanis acutis. 

 Hab. supra truncos Callistemonis eUiptici (^A. C.) in insula septentrionali Novcb 

 Zelandice^ juxta mare, incolis Raumangha ; R. Cunningham (hab. s. sp. 

 comm. eel. A. Cunningham). 



This species is nearly allied to D. bifioriun, of which I had examined no 

 specimens at the time the Gen. et Sp. Orch. was published. Having since 

 received that plant in a good state from Mr. Mathews, who found it in Otaheite 

 hanging from the branches of trees, I am enabled to offer a correct definition of 

 that very rare plant. 



D. bijforum Swartz; caule penduio gracili tereti, foliis lineari-lanceolatis acumi- 

 natis planis, pedunculis bifloris lateralibus e paleis corneis erumpentibus, 

 sepalis petalisque acuminatissimis, labello rhomboideo medio bilamellato tri- 

 lobo lobis lateralibus acutis nanis intermedio deltoideo acuminato margine 

 fimbriato. 



3. D. Grifjithianinn ; caulibus erectis elongatis clavatis sursum tetragonis apice 



diphyllis, foliis lanceolato-oblongis obtusis, racemis laxis flexuosis multifloris 

 penduhs e latere caulium natis, bracteis oblongis membranaceis pedicellis 

 4-plo brevioribus, petalis oblongis ciliolatis sepalis duplo latioribus, labello 

 ovato pubescente denticulato subrepando, capsulis pyriformibus angulatis. 

 Hab. in Regno Burmano supra arbores, W. Griffith, {hab. s. sp. comm. eel. 

 Griffith.) 

 A beautiful species with much the appearance of D. aggregatum. 



4. D. extinctoriujn ; pseudobulbis depressis orbiculatis aggregatis, foliis . . . ., 



pedunculis terminalibus unifloris, sepalis lateralibus posticis basi longe in 

 cxtinctorii forma productis, labelli ungue longissimo tenui, limbo trilobo : 

 lobis lateralibus erectis acutis intermedio oblongo rotundato, capsula pyriformi 

 angulata. 

 Hab. in Regno Bvrmano locis humidls supra truncos Careyae arboreae, W. 

 Griffith {hab. s. .sp. comm. ccl. Griffith.) 



This is next D. pnsillum Blume, and has very much the appearance of a 

 Bolbophyllum. Its leaves have not been seen. 



