HI.— DESCRIPTIONS OF NEW SPECIES. 

 Salenia globosa, ^per. nor. 



Test circular in outline, subglobose ; apical system relatively 

 .small, hemispheric ; vent excentric, irregularly pentagonal, 

 Interambulacral tubercles large, seven in each vertical row ; 

 interambulacral zones comparatively wide, each at the ambitus 

 about four times as wide as the ambulacrum in the same region. 



Ambulacral zones with two outer rows of small secondary 

 tubercles, between which are four oblique rows of smaller tubercles 

 and some scattered granules. Pores in pairs, oblique ; one pair 

 to each ambulacral plate. 



Peristome, smaller in extent than the apical system, witli very 

 shallow incisions. 



Dimensions. — Height, 13-5 ; width, 18 mm. 



Locality. — Glauconitic limestone, Aldinga Cliffs (2 exs.) 



This second species of SaJenia from our Tertiary is separable 

 from S. tertiaria by its globose form and by having seven, in 

 place of six, primary tubercles in each interambulacral row. Of 

 the very many specimens of S. tertiaria which I have had under 

 observation, I find no tendency to become conoid ; it is, more- 

 over, a much larger shell, the corresponding measures for 

 8. tertiay-ia being 8--D and 14, and 8 and 17 '5. In. shape this 

 new species is exceedingly like the Cretaceous *S'. gibba, Agassiz, 

 but is distinguished from it, among other characters, by having 

 one pair of pores to each ambulacral plate, a character possessed 

 by ail Tertiary and the Recent species. 



Seutellina patella, -vx'-- 'lor. 



Test large for the genus ; subcircular to subdecagonal in out- 

 line ; regularly conic. 



Base regularly deeply-concave, the ambital margin tumid and 

 narrowly defined abactinally. 



Peristome central, nearly circular; moderately large ; periproct 

 supra-marginal, circular, very small as compared with the peris- 

 tome. 



Genital pores four ; poriferou-. zones concealed beneath the 

 ornament. 



Interior with well-developed vertical partitions radiating to- 

 Avards the peristome. 



Tubercles uniform, small, and perforate, rather wide apart, 

 surrounded by scrobiculate ornament. 



Dimensions of two examples : — Longitudinal diameter, 24, 22 ; 

 transverse diameter, 22*5, 21; height, T--"), 6. 



.Localities. — Calciferous sandstones of the River Murray Cliffs 

 (connnon); white polyzoal limestone at Mount Gambler; polyzoal 

 sands, ]Muddy Creek. 



