MR. W. JOSHUA OX BUltMESE DESMrDTE.E. 639 



spines, 28^; width of constriction 7/u; length of polar notch 

 12 fi, and width at base 4/*. 



E. coralloides, n. sp. (Plate XXIII. fig. 10.) 

 E. parvum nonnihil longius quam latum : semicellulis 4- 

 lobatis, anguste constrictis, prominentiis quatuor truucatis in 

 quavis seinicellula ; angulis latis hirsutis, truncato-elongatis : 

 membrano pallide roseo. LoDgit. 40 /j, latit. 30 fi : isthmi latit. 

 13,1. 



Small, rather longer than broad ; semicells 4-lobed ; con- 

 striction narrow, with wide angle ; four truncate protuberances 

 in each semicell ; angles rough and truncate-elongate, giving the 

 whole plant a rough and coral-like appearance ; membrane pale 

 pink. Length 40 ju ; breadth 30 fx ; width of isthmus 13 fi. 



E. truncatum, n. sp. (Plate XXIII. figs. 6 & 7.) 

 E. mediocre, subquadrangulare, fere duplo longius quam latum : 

 semicellulis 3-lobatis, marginibus laevibus crenatis, lobis lineari- 

 diyisis, basi globose inflatis, lobo polari attenuato, leviter de- 

 presso : prominentiis centralibus magnis, duabus in quavis semi- 

 cellula : isthmo lato, sinu lineari stricto. Longit G5 ft, latit. ad 

 basin 37 \i : lobi polaris latit. 24 \i : isthmi latit. 16 fi. 



Medium size, subquadrangular, about twice as long as broad ; 

 semicells 3-lobed, with smooth erenate edges; polar lobe atte- 

 nuate, with slight depression ; central protuberances large, two iq 

 each semicell ; isthmus wide, with close linear notch ; divisions of 

 lobes linear; basal portion a circular inflation. Length 65 p; 

 breadth at base 37 ft ; breadth of polar lobe 24 /z ; width of isthmus 

 16/*. 



E. ATTENUATUM, Wolle. 



E. SERRATUM, n. sp. (Plate XXIII. figs. 1 & 2.) 

 E. vix duplo longius quam latum, profunde constrictum ; 

 semicellulis 6-lobatis, prominentiis duabus magnis in quavis 

 cellula, late a puncto divisionis remotis, lobis lineari-divisis, ad 

 basin globosis, angulis acutis, interne conspectis distincte ser- 

 ratis, lobis terminalibus incisis, angulis exterioribus divergen- 

 tibus, attenuatis. Longit. 58 n, latit. 35 n : isthmi latit. 8 ft. 



Scarcely twice as long as broad ; constriction deep ; semicells 

 6-lobed ; angles sharp, having on inside view a decided serrate 

 appearance, with two large protuberances in each semicell, widely 

 removed from point of division ; isthmus nearly quarter of width ; 

 end-lobes incised, with exterior angles divergent and attenuated ; 



