212 SUMMARY OF CURRi'Ni' RESEARCHES RELATING TO 



two species of Caiderpa grew on this one small reef, he made collections- 

 himself by diving in January, April, July, August, October, and 

 December. He has no longer any doubt that his plants are of the same 

 species, which assumes different appearances according to the season. 

 Both forms are described in this paper, and it is suggested that C. Stahlii 

 Web. v. B. may be synonymous with the Japanese species. A great 

 characteristic of Yendo's plant is the inflation of the short pedicels. 

 If this character occurs in C. Stahlii and also in the types of 0. anceps 

 Harv. and G. brachypus Harv. (to which types the author has unfor- 

 tunately not had access), the three species would lose any character 

 which could distinguish them from one another. 



A New Species of Hedophyllum.* — K. Yendo also describes and 

 figures a new species of this genus, under the name of H. spirale, col- 

 lected by him at the island of Shimushu, Kurile Islands. A form, Tcamts- 

 chatlcensis, is also described from the shorts of Yavina, Kamtschatka. 

 The plant is common on the reefs at Shimushu. It differs from H. sub- 

 sessile Setch. in having a spiral rolling of the margins of the lamina at 

 the transition region. The author has also studied the development of 

 Thalassiophyttum and Arthrothammis, and finds he can add nothing to 

 the description of the former as given in Setchell and Gardner's " Alga? 

 of N.W. America." But of the development of Arthrothammis bifidus, 

 nothing has hitherto been published, and the author therefore describes 

 it here. He states also that in A. kurilensis the entire plant is erect, 

 and, consequently, the dorsiventrality of the stems is not clearly 

 manifested. The primary stem and holdfast are persistent, and the 

 successive holdfasts or rhizomes are not normally found. Otherwise, 

 the development is the same as that of A. bifidus. Comparisons are 

 drawn between Hedophyllum, Thalassiophylhim, and Arthrothanmus, 

 which greatly resemble each other in their mode of branching. As 

 regards the systematic position of Hedophyllum, the author places it 

 near to these two genera on account of the erosion of the primary 

 lamina, the spiral rolling and the differentiation of the dorsiventrality 

 in H. spirale; and if the first of these characters be omitted there is 

 also a likeness to Agarum. As regards the genus Eisenia the author 

 suggests that it should be detached from the subtribe Ecklonia? and 

 placed near Arthrothanmus and Hedophyllum, if it be granted that 

 erosion of the primary lamina is a character of importance. 



Halimeda Fuggeri.t, — This fossil alga was described by J. L. von 

 Liburnau in 18D7, and the same author now adds further details as the 

 result of an examination of several fresh specimens which have been 

 found in the same locality, Muntigl near Salzburg. They are preserved 

 in the Salzburg museum. Careful comparisons are made between these 

 fossil plants and recent specimens of Halimeda, and the points of dis- 

 similarity are fully dealt with. They are small in themselves, consisting 

 of an apparent scaliness of the surface in the fossil alga, a want of 

 incrustation, the breadth of the mid-rib, the length of the internodes, 

 the much-lengthened, rod-like, unjointcd end to one of the specimens, 



* Bot. Mag. Tokyo, xvii. (1933) pp. 167-"1 (1 pi A 



+ SB. k. Akad. Wiss. Wien., cxi. (190 i) p,>. (585-712 (2 pis. 9 Sgs. in text). 



