6i 



Reinboldi. The plant also approaches in habit to Archaeolithothamnion erythraeum, though 

 more seldom, and cannot even in this respect be confounded with the latter except when the 

 specimens are dead, water worn or much bleached. Such a specimen, anastomosed with the 

 said species, is represented pi. XI, fig. 17, 



In the Siboga collection the species in question is not well represented except from 

 station 91, where a number of large and well developed specimens have been collected (PI. XI, 

 hg. 14 — 16). These specimens belong to f. japonica. On the other hand, there occurs no old 

 specimen of f. angularis, but only a couple of young ones showing transition to this form. 

 At stat. 303 the species is represented by a delicate form, which partly resembles Lytlwphyllum 

 Marlothii in habit. It is, however, differing from the latter in structure, as the cells are in 

 part even a little longer than commonly seen in L. Okamurai. Therefore, I consider it as a 

 somewhat stunted form of this species (PI. XI, fig. 18 — 19). The plant in question bears 

 sporangia in the months of February and June, but scantily. 



Occurrence: This species has apparently been abundant at stat. 9 1 , the only station 

 in the investigated area where it occurs typically and well developed. From the other stations 

 above quoted have been brought home but a single or a few young, frequently stunted and 

 not always quite certain specimens. 



Area: South Pacific : Tami Island on the north-eastern coast of New Guinea ; North 

 Pacific : The Pacific coast of middle Japan l ). 



Subgen . Lepidomorph u m Fosl . 



a. Crustacea. 



3. Lithophyllum Yendoi Fosl. PI. XI, fig. 1 — 4. 



New or crit. Lithoth. p. 25. 



Stat. 51. Madura Bay and other localities in the southern part of AIolo Strait. Shore. 



Stat. 61. Lamakera, Solor Island. Reef. 



Stat. 86. Dongala, Palos Bay, Celebes. Reef. 



Stat. 155. Piapis Bay (Telok Sapira), Northwest coast of Waigeu Island. Reef. 



Stat. 181. Ambon. Reef. 



Stat. 193. Sanana Bay, East coast of Sula Besi. Reef. 



Stat. 240. Banda-anchorage. Reef. 



The type specimen of this species is picturecl pi. XI, fig. 1. In the area investigated 

 the plant fully coincides with the type from the coast of Japan (PI. XI, fig. 2 — 3). As regards 

 structure, however, the cells sometimes prove to be a little larger than the measures given 1. c. 

 But there is no great variation in this respect. 



When growing on an even substratum, the plant is almost quite even, the crust closely 



1) In the Bvitish Museum a couple of specimens ave kept under the name of Lithothamnion polymorphum from the Rodri^uez 

 Island in the Indic. They were some years ago placed by myself under Lithophyllum racemus. The specimens also come very near to 

 L. Okamurai in habit, but are likely to be referred to a densely branched form of L. Kaiserii^ if as remarked above, the latter is on 

 the whole to be maintained as an independent species. — Cp. George Murrav. An Introduction to the Study of Seaweeds. London 

 1895. Fig. 83 (p. 242). 



