30 ' MR. FREDERICK CHAPMAN ON THE 



The larger, pyramidal form, when sliced medially, shows the existence of a 

 comparatively small initial chamber, followed by at least three complete 

 triserial sets of chambers ; these are succeeded by three sets of quasi- 

 textularian segments, and terminated by five in the miiserial part of the 

 test. 



The former variety, with its large initial chamber and comparatively few 

 segments, may be regarded as the megalospheric condition (form A) of 

 C. angularis ; and the latter, with its small initial chamber and succeeding, 

 numerous chambers, as the microspheric condition (form B) of the same 

 species. 



Hantken figured some specimens almost identical with our form B * from 

 the Older Tertiary of Hungary, which he named Clavulma Szaboi. 



It is noteworthy that the recent specimens hitherto recorded all seem to 

 belong to form A. 



Howchin recorded C. angularis from the Lower and Upper Beds of Muddy 

 Creek. Vine recorded ' Tritaxia tricarinata ' from the Port Phillip Tertiaries ; 

 this is evidently the above species, of form B, which T. tricarinata very 

 closely resembles. The distinctive character of the valvuline aperture in 

 C. angularis clearly separates it from the genus Tritaxia, which has a simple, 

 circular orifice. 



Occurrence. — Form A : Grrice's Creek, very common ; Altona Bay Coal- 

 Shaft, very common. Form B : Grice^s Creek, very rare ; Altona Bay Coal- 

 Shaft, frequent. 



Clavulina textularioidea, Goes. (Plate 4. figs. 74, 75.) 



Clavulina parisiensis, d'Orbigny, forma textularioidea, Goes, 1892, Arctic and Scand. 

 Khizop., Svenska Vet.-Akad. Handl. vol. xxv. No. 9, p. 42, pi. 8. figs. 387-399. 



Clavulina textularioidea, Goes, 1896, Bull. Mus. Comp. Zool. vol. xxix. No. 1, pt. 20. 

 p. 37, pi. 4. figs. 26-38. 



The Australian Tertiary specimens of Clavulina, which have a cuneate 

 aboral end and nodosariform chambers in the terminal series, belong to the 

 above species rather than to C. parisiensis, which is the only form much 

 resembling it yet recorded from these or similar beds. The chief difference 

 between the two forms lies in the arrangement of the earlier series of 

 chambers, which in C. textularioidea are very nearly comparable with those 

 of Bigenerina nodosaria d'Orb., but more compressed and carinate (Goes). 



The compression of the earlier portion of the test is often so marked as to 

 cause the shell to resemble Haplophragmium agglutinans, but that the 

 chambers are arranged as in Textularia. 



Vine recorded, under the name of C. parisiensis, what is probably the 

 above form, from the Port Phillip Tertiaries. 



* Mitth. d. Jahrb. k.-ungar. Geol. Anstalt, vol. iv. p. 15, pi. 1. figd. 9 a-d. 



