8 ART. 12. K. YEN DO. 



= Arthrocardia eorymbpsa Aresch. in J. Ag. Spec. Alg. II. p. 550. 



= CoraUina magnifica Leach, (sec. Harv. Ner. Aiistr. p. 99.) 

 a. Aresch. in J. Ag. Spec. Alg. II. p. 551. 



= CoraUina eorijmbosa Lamk. Mem. Mns. II. p. 234. 

 ß. Aresch, in J. Ag. Spec. Alg. II. p. 551. 



== Ampiroa eorijmbosa Harv. Ner. Austr. p. 99. t. 38. 

 A. aberrans Yendo. Cor. ver. Jap. p. 16. PL I. fig. 1-5 : PI. V. fig. 1-3. 

 Ä. Wardii Harv. Ner. Austr. p. 99. t. 38. 



= Arthrocardia Wardii Aresch. in J. Ag. Sjiec. Alg. II. p. 551. 

 A. Mallardise Harv. Ner. Austr. p. 99. 



= Arthrocardia MallarcUœ Aresch. in J. Ag. Spec. Ag. II. p. 552. 



SPECIES DO l B TFUL. 



CoraUina rigida Kütz. Spec. p. 708. 



Amphiroa constricta Kütz. Tab. Phyc. VIII. p. 24. Tab. 49. fig. 3. 



CoraUina gomphonemacea Kïtz. 1. c. p. 30. Tab. 63. fig. 1. 



CoraUina frond escens Kütz. (nee Post et Rupr.) 1. c. p. 29. Tab. 59. 



fig. 2. 

 CoraUina arbuscida Kütz. (nee Post, et Rupr.) 1. c. fig. 3. 



Arthrocardia was first established by Decaisne as the second 

 section of the genus A^nphiroa. Areschoug elevated it to a distinct 

 genus. Both writers enumerated two differing groups under a 

 sinofle section or genus. It is reo;rettable tliat Schmitz, when he 

 united Arthrocardia Akesch. with Chilosporu7n, did not recognize 

 this confusion. Madam Weber re-established Arthrocardia 

 Aresch. She^seems to have overlooked the peculiarities in the 

 position of the coneeptacles of those species such as Cheilosporum 

 frondescens, C%eiL yessœnse, etc., which are enumerated under the 

 section Alatocladia in the present paper. In distiguishing Arthro- 

 cardia from Cheilosporum she states : " The position of the con- 

 ceptacula, however, marks a difference between the genera : in 

 Arthrocardia we find conceptacula on the joint as in Amphiroa ; 

 in Cheilosporum we find them immersed in the margin of the 

 broadened, wing-like joint " This distinction holds good 



