AET. 20 THE GENUS SIPHONINA AND OTHER GENEEA CUSHMAN" 13 



early stages as well as of sections of the test to determine the develop- 

 ment especially in the microspheric form. Material has not yet been 

 available in sufficient amount for this work. 



SIPHONINOIDES LAEVIGATA (Howchin) 



Plate 4, figs. 6 a, & 



TruncatuUna echinata H. B. Brady, var, laemgata Howchin, Trans. Proc. Roy. 

 Soc. So. Australia, vol. 12, 1889, p. 13, pi. 1, fig. 8. 



Test subglobular; the chambers indistinct; wall smooth; aperture 

 nearly circular with a slight lip but no neck. 



Diameter about 0.35 mm. 



Howchin's types came from the Tertiary, (Balcombian) from 

 Muddy Creek, Victoria, Australia. I have topotype material through 

 the kindness of W. J. Parr. The specimens seem sufficiently distinct 

 from Brady's species to warrant giving it specific rank. 



SIPHONINOIDES ECfflNATA (H. B. Brady) 



Plate 4, figs, 7 a, I, 8 a, b 



PlanortuUna echinata H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 



283, pi. 8, figs. 31 Or-G. 

 TruncatuUna echinata H. B. Beady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 670, pi. 96, figs. 9-14. 



Test subglobular, the chambers irregularly trochoid, sutures slightly 

 depressed, often indistinct; surface covered with short blunt spines; 

 aperture circular with a short neck and thickened lip. 



Numerous specimens have been referred to this species by different 

 authors not all of which may belong here. In the Muddy Creek beds 

 of Victoria, Australia there are specimens similar to that figured 

 (pi. 4, figs. 7 a,h) which may be referred to Brady's species which are 

 all from the Indo-Pacific. 



The specimen figured (pi. 4, figs. 8 a,h) from the Atlantic, off the 

 Tortugas, may prove to be a distinct species. The projections of the 

 surface are very few in number and the wall is thick and con- 

 spicuously perforate. 



SIPHONINOIDES GLABRA (Heron-Allen and Earland) 



TruncatuUna gla'bra Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 

 20, 1915, p. 711, pi. 52, figs. 41-^7. 



" Test nearly spherical, consisting of about two to three convolu- 

 tions of chambers; three to four chambers in the last convolution, 

 which is inclined at an angle to the axis of the preceding ones, so 

 that the early convolutions are almost, or entirely, inclosed. Shell- 

 wall somewhat thick, but much thinner than in T. echinata Brady 



