JOUENAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XX., ARTICLE 12. 



A Revised List of Corallinse. 



By 

 K. Yendo, Rigaliushi. 



SYNOPTICAL KEY TO THE GENERA. 



A, Mother cells of the propagating cells generate! in the cortex : genicula 

 unizonal or nuiltizoiial : articuli cylindrical, compressed or sagittate: 

 ramification dichotomous, pinnate or irregular. Conceptacles verrucose, 



hemispherical or conical, sessile oen. j. Amphiroa. 



I. Medullary portion of articuli constructed with several zones of articoli 

 interposed between zones of otricoli. 



a. Articuli cylindrical, irregularly branching. Genicula multizonal rarely 

 unizonal, lineœform Sect. I. Euamphiroa. 



b. Articuli compressed or subcompressed, mostly dichotoniously branch- 

 ing. Genicula multizonal, mostly fenestraform in younger portion, 

 bandform in older portion Seet . //. Eury tion. 



II. Medullary portion of articuli constructed ^Yith zones of articoli. 



a. Articuli compressed sagittate, reniform, or truncate, pinnately 

 branched ; genicula unizonal, lineseform. Conceptacles on the sur- 

 face of the compressed articuli Seei. III. Arthrocardia. 



b. Articuli cylindrical or compressed sagittate, or linear, pinnately or 

 irregularly branched. Conceptacles conical or hemispherical, pro- 

 minent on the margins of the compressed articuli, or on the surface 

 of cylindrical articuli spct IV. Marginisporum. 



ß. Mother cells of the propagating cells generated in the medulla ; genicula 

 unizonal or multizonal ; articuli cylindrical, compressed, sagittate or trun- 

 cate ; ramification pinnate, dichotomous, verticillate or irregular. Con- 

 ceptacles verruculose, globular or pear-shaped. 

 I. Genicula multizonal ; ramuli starting from the genicula. 



a. Articuli cylindrical, ramuli verticillate 



<ie„. ji. Metagoniolithon. 



b, Articuli flat, di-trichotoinously branching oon. iii. Litharthron. 



