No, 5] NEW OR CUITICAL CALCAREOUS ALGÆ. 25 



have been attached by inferior animals, at length entirely fiUing 

 the cavity and destroying the sporangia, but not the conceptacle 

 itself. Therefore, I have but succeeded in finding a solitary sporan- 

 gium which is four-parted, about 100 fi long and 40 p- broad. 

 Some other and larger conceptacles probably are those of cysto- 

 carps, but everywhere examined has been attacked by the said 

 organisms. 



In structure it is rather varying, as far as seen not showing 

 any stratification, the cells often rather dilYerent in size, varying 

 between lO and 24 /x in length, partly nearty square partly a little 

 longer or up to IV2 times longer than broad. The walls of the 

 cell-rooms are thick. 



The spedes stands nearest to G. mamillare which it approa- 

 ches even in structure, but is on the other hand separated by 

 essential characters. 



It is known from Cape Jaffa, South Australia, where it does 

 not seem to be scarce. Dr. Aug. Engelhart. 



Goniolithon (Lepidomorphum) Yendoi Fosl. mscr. 



Thallus crustlike, at first forming thin, purplish, suborbicular 

 or irregular crusts on stones. More than one crust founded on 

 the same substratum soon become confluent, the limits sometimes 

 not to be seen, sometimes as more or less distinct ridges, or the 

 one crust stretches itself over the other. It attains a thickness of 

 about 1 mm., and is smooth even in an advanced state, developing 

 numerous reproductive organs. But when older it often becomes 

 more and more uneven, producing small wart-like excrescences, 

 or some uneveness is caused by the substratum, or by covering 

 up small extraneous objects. 



The conceptacles of sporangia are rather crowded here and 

 there in the crust, subhemispheric-conical, 200 p- in diameter seen 

 from above, with an apical pore and a few very delicate bipores, 

 the latter extremely difficult to detect, and often apparently not to 

 be found. The tetrasporangia are about 90 p. long by 25 p. 



Some other conceptacles almost coinciding with the latter in 

 external appearance probably are those of c\^stocarps, and some 



