126 



tion of the sporangia in immersed conceptacles apparently takes 

 place in a more slow succession and, therefore, the middle walt 

 may perhaps be even fully developed before the other walls are 

 founded. The specimen also bears conceptacles of cystocarps in 

 development. 



The named specimens from the Adriatic Sea (Hauck's colU 

 No. 72) belongs to the same series of forms, and so also most 

 probably that represented in Hauck, Meeresalg. t. 1, fig. 5. The 

 other figure (4) not unlikely is identic with the below mentioned 

 f. Harveyi. The one specimen has a rather even and smooth 

 surface, with a couple of smaller and rather clumsy protuberances. 

 In the other some individuals originally have fastened themselves 

 to one and the same substratum, in their farther growth anasto- 

 mosing, and the edges trumbling each other form coarse ridges. 

 Otherwise it is partly even and smooth partly with some few irre- 

 gular processes. In both I found some few conceptacles of spo- 

 rangia fully according with those in L. depressum Cm., seen from 

 the surface 60 — 80 fi in diameter. In a few others the whole 

 roof has by some reason disappeared, the emptied conceptacle for- 

 ming a hole about 200 fj. in diameter. 



Another and younger specimen from Hauck's herbarium, ga- 

 thered at Miramar and labelled L. Lenormandi nearly covers an 

 individual perhaps being the latter, which specimen probably also 

 belongs to the same series of forms as the above mentioned. It 

 is richly provided with in part even confluent cystocarpic concep- 

 tacles, that very nearly accord with those mentioned under L. de- 

 pressum Crn., about 150—200 /* in diameter. 



The here mentioned specimens without any doubt belong to 

 one and the same species, L. depressum Crn., which I adopt as 

 a form of L. incrustans Phil., very likely being the typical form 

 of this species. This form is, besides, as to the reproductive or- 

 gans, characterized by its crust either being in part even, or bea- 

 ring more or less numerous subhemispherical or irregular, but fre- 

 quently small processes. The peripherical portion is in general and 

 especially in older individuals not much thinner than the internal, 

 never, so far as I have seen concentric zonated and not even in 



