CORALLINJ-] VEK^ JAPOXICiE. H 



boundary is liard to draw. The shallow water form has very often 

 the terminal articuli cylindrical and a])proaches to a form of the 

 preceding species. 



Usually found at the depth of ')-'2() ft. below low water mark : 

 the shallow water form, hoAvever, often found at tlie low tide mark. 

 Misaki : Shimoda : Sunosaki. 



6. Amphiroa echigoensis, sp. nov. 



ri. J. fio'. 15-10 : ri. i\. iio-. 10. 



Fronde subcompressa latitudine equali, dichotoma : articulis 

 nfimis cylindraceis, brevissimis, mediis subcompressis equicrassis, 

 0.()-0.9 mm. Litis, o-o mm. longis, superioribus plus minus com- 

 pressis, baud transverse striatis, ultimis apice rotundis ; geniculis 

 diametrum lequantibus majoribut^quc ; conceptaculis minutis sub- 

 promineritibus. 



The articuli are somewhat com])ressed except near ihe base. 

 Their breadth is homoo'eneous throuofhout the entire frond, measurini"' 

 O.G-0.9 mm. in diameter. 15ut those in the ultimate portion are 

 slightly compressed and broader. The genicula are equal in breadth 

 ito the articuli looking as the brown bands on the dried specimens. 

 In this species neither the transverse striation nor the furrow near 

 the a])ical margins can be seen. 



This species undoubtedly stands near to the former, but differs 

 widely in its internal structures ; the cortical part consists of several 

 layers of the parallelo})edal cells, compactly arranged in an anticlinal 

 direction, thickly covering the zonal arrangement of the periclinal 

 cells ; concej)tacles «are slightly prominent but frosted over the whole 

 surface of the articuli. It has some resemblance with Aiiqyhiroa 

 algeriensis, Kiltz. and A))q). exilic. Harr. Yet differs from the former by 



