294 SIDNEY F. ETARMER. 



doni, S. alveolata) having a i-ichei' representation than 

 any other locality. The characteristic species of the Indian 

 Ocean appear to be S. sulcata and S. Buskii, while S. 

 aiiricLilata occurs in Madagascar^ and S. simplex in the 

 Auiirante Islands. New Zealand has one species (S. neoze- 

 lanica), which occurs in two well-marked varieties, one of 

 which is recorded from Tongatabu. Australia has a larger 

 number of species ; in addition to those from Torres Straits, 

 S. truncata and S. tubulosa occur off its southern coast. 



It may further be noticed that MacGillivray ^ describes 

 four Tertiary species of Steganoporella from Victoi'ia. Of 

 these S. pa tula, Waters, does not seem to me to be a 

 Steganoporella, as is shown by the occurrence of avicu- 

 laria and external ovicells, and by the Thalaraoporella- 

 like condition of the cryptocyst. S. depress a, MacGilL, 

 is not represented in the recent collections I have examined. 

 S. lateralis and S. Haddoni (described by MacGillivray 

 as S. magnilabris) are recorded above from Torres Sti'aits 

 and other localities. 



Waters describes fossil Steganoporella from various 

 localities ^ in Australia and New Zealand, but I am not able 

 to refer them with certainty to any of the recent species. 

 Forms related to Steganoporella, although probably not 

 to be referred to that genus, are common in various deposits 

 in Europe, the Cretaceous deposits being very rich in these 

 forms, as Jullien (1881) has pointed out. It may probably 

 be concluded that the Steganoporellidse (including Tha- 

 lamoporella and other similar genera) are a group of world- 



' ' Trans. Roy. Soc. Victoria,' iv, 1895, pp. 53, 54. MacGillivray uses the 

 term " opesia " lor llie part of the zocecium distal to the commeucement of 

 the descending portion of the cryptocyst — a use of the term which would be 

 difficult to employ in describing a species (e. g. S. Buskii) in which there 

 may be no marked line of demarcation. JuUien's orifrinal de6nition as ap- 

 plied to Steganoporella shows that the term should be used for the opening 

 of the tube ; in other words, to the opening limited by the free edge of the 

 cryptocyst. 



2 'Quart. Journ. Geol. Soc.,' xxxviii, 1882, pp. 265, 506; xxxix, 1883, 

 p. 436; xli, 1885, p. 292; xliii, 1887, p. 50. 



