— 21 - 



Lithophyllum Phil, emend. 



Subgen. EuTithophyllum Fosl. 



5. L. racemus (Lam.) Fosl. 



List of Lilh. p. 9 ; Millepora (Nullipora) racemosa Lam. Hist. an. s. vertebr. 

 2, p. 203. 



f. crassa (Phil.) Fosl. 



1. c. Lithothamnion crassum Phil, in Wiegm. Arch. 1837, p. 388. 

 Syn. Lithothamnion racemus Aresch. in J. Ag. Spec. Alg. 2, p. 521. 

 — crassum Hauck, Meeresalg. p. 273. 



With some reservation I refer two specimens to the above form of 

 this species. They are but 1 — 2 cm. in diameter, sterile and seem to 

 have been dead when collected. Overgrown conceptacles are not to be 

 found. The specimens agree however in habit with young ones of the 

 said form. So also in the main with reference to structure. 



Between Koh Mesan and Gape Liant on a depth of 9 fathoms. 



Area: North Atlantic: South coast of England (only dead specimens 

 known), Bahama; the Mediterranean and the Adriatic; the Red Sea: Indian 

 Ocean: Mauritius, Rodriguez. 



Subgen. Lepidomorphiim Fosl. 



6. L. Yendoi Fosl. 



New or crit. calc. Alg. p. 25. 



On the Pacilic coast of Japan this rather easily recognisable spe- 

 cies sticks to stones as far as hitherto known. In the Gulf of Siam 

 it appears to be rather abundant on small Gonchs, Gerithia, forming thin 

 crusts little by little almost covering the host, and furnished with repro- 

 ductive organs in the middle of March. The specimens from this place 

 agree in the main both in habit and structure with the typical form of 

 the species except that they are smaller. 



Koh Sarlak on Cerithium Morus in shallow water (between tide-marks). 

 Area: North Pacific Ocean: Pacific coast of middle Japan. 



Melobesia Lamour. emend. 



7. M. fa riii osa Lamour. 



Polyp, flex. p. 315; Rosan. Mélob. p. 59. 



Also in the Gulf of Siam this widely dispersed species sticks to 

 divers other Algæ. Well developed specimens have been found on 

 Halimeda macroloba and Padina. On Cystoseira latifrons it grows 

 together with Bryozoa, the one partly covering the other. The basal 

 cells are on a section almost square and about 7 fx in diameter. It is 

 provided with sporangia , antheridia and carpospores in the middle of 

 February. 



