18 ATE. 12. — K. YENDO. 



sharply defined from all others, and its members belong exclusively 

 to the warmer seas. The extreme forms of the Eucheilosporum 

 and of the Alatocladia show indeed some differences with regard 

 to their habit and the external appearance. But I consider the 

 differences not to be of sufiicient tenor to justify their separation 

 into different genera. In the Alatocladia the position of the 

 conceptacles is rather indeterminate, so that we can not delineate 

 a sharp boundary to separate it from the Eucheilosporum. 



The Serraticardia has the external form closely resembling 

 that of the Arthrocardia. By the position of the conceptacles 

 and the phi nation of the branchlets, these two sections may easily 

 be distinguished one from another. Only two species are assigned 

 to the former section. They have two sorts of conceptacles, which 

 may occur in an individual or in one branch at the same time. 

 One is imbedded at the top of the branchlet, or articulated lobe, 

 as it were. Another is situated upon the surface of articulus. 

 The former character suggests Corallina and the latter, no doubt, 

 is the peculiarity found in the members of the Alatocladia. 



Sect. I. EUCHEILOSPORUM Yendo. Enumer. Cor. p. 193. 



Cheilosporum elegans Aresch. in J. Ag. Spec. Alg. II. p. 546. 



= Amphiroa elegans Hook, et Harv. Ner. Austr. p. 101. PL 

 XXXVIII. 

 C. sagittatum Aresch. in J. Ag. Spec. Alg. II. p. 545. 



= Corallina sagittata Lamx. Freyciu. Voy. p. 625. t. 05. fig, 11-12. 



= Amp. sagittata Done. Memoir, j). 113. 

 C. jungermannioides Rupr. in J. Ag. Spec. Alg. II. p. 546. 

 C. spectabile Harv. Friendly Isl. Alg. no. 31. 

 C. cultratum Aresch. in J. Ag. Spec. Alg. II. p. 545. 



= Amp. cuUrata Harv. Ner. Austr. p. 102. PI. XXXIX. 

 ß debilis f 



= Amp. cultrata ß debilis KützJ Tab. Phyc. VIII. p. 27. Tab. 54. fig. k. 1. 



= Amp. cultrata y globulifera Ktixz. 1. c. Tab. 55. fig. 1. 



