98 W. B. TIUNMI, KKKNU-WATKR ALO.K OK KAST INDIA. 



cilis. Ktiam prope .1/. Bali Kao. (Desm. Polon. p. 40, T. XIYi, f. 1) sed superticies 

 et apicibus lobulorum non mucronatis vel aculeatis. 



Long. 184, lat. 1(54 /n. T. XXIII, f. 2. 



Khasia, ut supra, comm. <•. von L. 1889* 



In this spevies, which is much smaller th;m M. marn mil lata Xob., the papillse 

 are, conical and quite round at their apices; it differs from the speeies named in hav- 

 ing the lobules acute and not rounded-off, with the exception of the superior and 

 interiör pairs of lobules, which are one-spined. The polar lohe is in form much like 

 that of M. apiculata. 



This genus seerns to contain but four principal types, which I would range under 

 the fellowing sub-genera: 



A. Holocystis (Hassall) emend. {oÅog, integer, x/ang, cellula) lobis polaribus indivisis; 

 lobis lateralibus transverse positis. 



Typ. spec. M. truncata; M. oscitans; M. pinnatifida; M. incisa. 



B. Atomocystis (aro/uog, non sectus; &c.) lobis polaribus vix vel non divisis; lobis late- 

 ralibus normaliter singulis radiantibus. 



Typ. spec. M. expansa, Bail.; M. stauromorpha, Non.; M. tropica. Xokdst. 



C. Actinocystis (ccxrcv, radius solis; &c.) lobis polaribus furcatis; lobis lateralibus ra- 

 diantibus. 



Typ. spec. M. rota.ta ; M. crux-melitensis, Ehr.; M. lux, Josh. 



D. Schizocystis (qxi£cö, scindo; &c.) lobis polaribus indistincte furcatis; lobis lateralibus 

 sub-radiantibus irregula riter positis; fröns sa>pe radiis vel processubus instructa. 



Typ. spec. M. Nordstedtiana; M. muricata; M. anomala, Xob. 



Of these sub-genera Holocystis falls nearest to Evastram (Eucosmhan), while 

 Schizocystis comes near Xanthidium. The discovery of a triangulär form of Micr. 

 pinnatifida (var. trigona, W. W.), by my friend W. West, is of great interest, as giv - 

 ing another decided connecting-link between this genus and its successors (cfr J. Bot., 

 Oct, 1889, t. 291, f. 15). 



Gen. 18. Xanthidium, Ehrb. 



(Abb. (1. Berl. Akad., p. 317, 1833, Ber. d. Berl. Akad. 1836, mut. cbar; Ralfs in Annals N. H. vol. XIV. 



p. 466, 1844—5. 



1. X. cosmariforme, n. sp. X. submediocre, circ. U-plo longius quam latius, »cosmari- 

 forme»; late ovale; semicellulee semicirculares, in eentro tumöre parvo instructse, an- 

 gulis rotundata? margine aculeis parvis (circ. 15) preditse; superficie tumoris granulata; 

 sinn lineäri, sub-angusto, extrorsum parum ampliato", membrana achroa vel fusco- 

 pallescenti. A latere visum lanceolatum, paullo constrictum, apicibus rotundatis, aculeis 

 in seriem verticalem ordinatis. 



Long. 39, lat. 27, lat. isth. 10, crass. 16, long. acul. 1.7—3 /u. T. XII, f. 17. 



F. eroluta. Series 3, non 1, aculeoruni margine; a latere visum series verticnles 

 3, habens. 



