WEBER-VAN BOSSHE—MARINE ALG Ad 301 
2. CERAMIUM spec. 
Cargados Carajos, 47 fms. 
On Heterosiphonia Rendlei; barren’ specimens. 
REINBOLDIELLA, De Toni. 
1. REINBOLDIELLA SCHMITZIANA (Reinb.), De Toni. 
Phycez japon. nove, 1895, p. 35. 
Gloiothamnion Schmitzianum, Reinbold, in Hedwigia, 1895, p. 205. 
Chagos Archipelago; Egmont, reef, in alcohol, on Gelidiopsis: Salomon Atoll, on 
Gelidiun. : 
Distribution. Japan; Malay Archipelago. 
Fam. GRATELOUPIACEA. 
Hatymenta (C. Ag.), J. Agardh. 
1. Hatymenta PonyciaDa, A. & EH. 8S. Gepp. 
Var. ALDABRADENSTS, n. var.—Thallo e callo basali subito cuneatim expanso 10 cm. 
alto, 4-5 em. lato deinde palmati-partito constante ; ramis usque ad 6 em. longis, 
05-1 cm. latis, ramulis lateralibus iterum iterumque subdichotomicis pinnatis, 
angustis. 
Aldabra, outer reef; dry specimens. 
Distribution. Christmas Island. 
Halymenia polyclada belongs to Agardh’s Acanthymenia section of Halymenia. 
According to Schmitz, it is highly probable that this group is identical with the 
genus Gelinaria, Sond. Schmitz is further of opinion that the differences existing 
in anatomical structure are sufficient to separate Acanthymenia from the genus Haly- 
menia. So long, however, as we do not know the cystocarps of the genus Gelinaria 
I think it more expedient to follow Agardh, although ultimately we will probably have 
to follow Schmitz and call the species of the Acanthymenia group by the generic name 
of Gelinaria. 
The specimens from Aldabra are very similar to H. polyclada, which is nearly allied 
to H. formosa. It has a subdichotomous ramification, but lateral ramuli are plentiful 
along the margins of the upper branches. In the lower part of the fronds the margins 
are almost entire. It is a stronger plant than H. polyclada, but has the same short stalk 
expanding suddenly into a broad frond. How far H. formosa, Durvillei, and polyclada 
are really good species, is a question that future investigations must decide. 
SECOND SERIES—ZOOLOGY, VOL. XVI. 39 
