638 MR. W. JOSHUA ON BURMESE DESMIDIE^E. 



E. retrorsum, n. sp. (Plate XXIII. figs. 14 & 15.) 

 JE. mediocre, diametro plus quam duplo longius, prominentiis 

 marginalibus instructum ; semieellulis obscure 3-lobatis, angulia 

 lateralibus productis, versus apicem recurvis, centro iuflatione 

 magna; cytiodermate crasso : isthmo vix attingente | partem 

 latitudinis : constrictione lineari. Longit. 75 fi. latit. apud 

 punctum constrictionis 35 fi. 



Medium size, rather more than twice as long as wide ; semi- 

 cells obscurely 3-lobed ; lateral angles produced, and pointing 

 backwards towards apex, with large central inflation ; cytioderm 

 thick; isthmus scarcely one fourth of width ; constriction linear; 

 cells ornate with marginal protuberances. Length 75 fi; breadth 

 at point of constriction 35 /*. 



E. obesum, n. sp. (Plate XXIII. figs. 19 & 20.) 

 JE. parvum, nonnihil longius quam latum : semieellulis 8- 

 lobatis, centre non inflatis ; lobis globose rotundatis, lobo polan 

 inciso, a latere conspectis ovatis, apicibus truncatis : membrano 

 pallide carneo, aliquando indistincte granulato. Longit. 50-80 ft, 

 latit. 30-35 : isthmi latit. 9-15 ft. 



SmaJl, rather larger than broad ; semicells 3-lobed ; each lobe 

 globularly rounded ; polar lobe with incision ; side view oval, 

 with truncated ends ; no central inflation of semicells ; membrane 

 a faint flesh-colour, sometimes indistinctly granulated. Length 

 50-80 n ; breadth 35-30 /x ; width of isthmus 9 : 15 ft. 



E. flammeum, n. sp. (Plate XXIII. figs. 3, 4, & 5.) 

 JE. mediocre, nonnihil longius quam latum: semieellulis 4- 

 lobatis, profunde constrictis, prominentia magna prope basin 

 cujusve lateris, lobis terminalibus truncatis, dilatatis, spiuum 

 robustum magnum apud angulos singulos ferentibua ; sinu 

 apicali profundo, magno, versus centrum nonnihil latiore, lobis 

 lateralibus tres spiuos magnos rectangulares ostendentibus. 

 Longit. (sine spinis) 48 ft, latit. (sine spinis) 28 ft : constrictionis 

 latit. 7 ^ : sinus polaris longit. 12 fi, basi latit. 4 fi. 



Medium size, rather longer than broad ; semicells 4-lobed ; 

 constriction deep, a large protuberance on each side near base ; 

 end-lobes truncate, dilated, bearing at each angle a large stout 

 spine ; the apical notch deep and large, somewhat widened to- 

 wards the centre, with three large rectangular spines at each side 

 of lateral lobes. Length 48 fi t without spines ; width, without 



