18 . . ^_ FOSLiE. [1899 



Engelhartii mentioned below, but also approaching L. kerguele- 

 num and L. Pliilippii, while L. capense is as yet a species not 

 at all well known and ought to be more neaiiy compared when 

 larger material is procured tlian that 1 at present possess. 



The most extreme limit of f. neglecta seems to be represented 

 in the specimen mentioned by Dicl<ie from Kerguelen land, re- 

 ferred by him to L. Uchenoides. According to Dick i e 1. c. H: 

 has been tåken in „Swain's Bay, common, Eaton. The only 

 example preserved was grappled in about 2 fathoms in a tideway 

 between two Islands, incrusting two sponges (Microdona atrosan- 

 guinea, Bk., and Halichondria incrustans, Jtn. ; both British spe- 

 des)". 1 have had the opportunity to examine this specimen. The 

 longest diameter is about 24 cm. by a thickness of about 4 cm., 

 growing over and between sponges, but also covering a great 

 number of other and smaller organisms. The lamels are more or 

 less plain, 0.5 — 1 or up to 1 5 cm. in diameter, and often rather 

 anastomosing. It reminds one much in habit of L. Uchenoides f. 

 depressa, but shows in other respects a nearer relationship to f. 

 Jieterophylla of the said species. However, it differs from L. 

 Uchenoides by a little smaller and less prominent conceptacles of 

 sporangia. Besides the cells are on a section shown to be fre- 

 quently rather short with thin walls, and in this respect pret ty well 

 agreeing with L. Muelleri. 



Among a number of specimens of the present species which 

 I got through the kindness of Dr. Aug. Engelhart, collected at 

 Cape Jaffa, South Australia, is a specimen in part covering a glo- 

 bular sponge and referrible to f. neglecta. The crust which elings 

 rather closely to the substratum is composed of a number of very 

 small lamels here and there stretched over one another. It bears 

 conceptacles of sporangia coinciding with those in L. Muelleri, 

 and stands nearest to the above mentioned specimen, but the la- 

 mels are frequentl}^ much confluent with each other. 



Lithothamnion Engelhartii Fosl. mscr. 

 f. umbonata Fosl. mscr. 

 f. imbricata Fosl. mscr. 



