No. 1] CALCAREOUS ALGÆ FROM FUN AFUTI. 11 



tion regularly alternated by a radiating row of cells which are 

 36 — 58 /i long and of the quoted breadth. The cells of the peri- 

 thallic layer are 10 — 18 p- long, towards the periphery nearly 

 square. The sporangia of this species are four-parted, 55 — 75 /* 

 long and 25 — 30 \i broad. 



Another species partly much resembling the present species in 

 habit partly approaching G. moluccense is described by Heydrich 

 in Bibl. Bot. 1 ) under the name of Lithothamnion Tamiense. It is 

 unknown to me, and the description 1. c. of a longitudinal section 

 is quite different from a similar section of any of the above species, 

 but reminds one rather of a trans verse section of one of them, 

 6r. moluccense. 



According to the list of the collection from Funafuti the spe- 

 cies in question has been collected in the following localities. 



A. No. 12, in part. Ocean Platform, opposite drill Camp, 

 Funafuti. 



A. No. 13, in part. Fualopa, Funafuti, about one foot below 

 low water springs. 



A. No. 14, in part. Fualopa. 



A. No. 46. Fualopa. „This type is very abundant on the 

 leeward (W.) islets of Funafuti atoll". 



A. No. 48, in part. „Coral partly overgrown with branching 

 Nullipore from Fualopa, both alive at the time they were collected". 



Nullipore from Beach S. of Village, Funafuti Lagoon. 



Thus it will be seen that the species probably is common 

 almost everywhere at Funafuti, growing just below low water 

 mark. The specimens A. No. 13 are more delicate, with thinner 

 branches than frequently in specimens from the other localities. 

 A. No. 12 — 14 grows in company with small specimens of Litho- 

 phyllum- craspedium and with L. orikodes, in part anastomosed 

 with the latter species. 



A fragment of another and dead specimen probably belongs 

 to the same species. It is labelled A. No. 59^ „Nullipore from 

 Lagoon platform at Funafala. This is an important rockformer. 



l ) F. Heydrich. Neue Kalkalgen von Deutsch-Neu-Guinea. Bibliotheca Bo- 

 tanica. Heft. 41. Stuttgart 1897. Pag. 1, t. I, fig. 4—7. 



