624 SOME SYDNEY DESMIDS, 



Long. 36; lat. 38; lat. corp. infra proc. 21; lat. isth. 12/x. 



Guildford (23). 



Cf. Boldt, Sibir. Chlor. T.6, f.34. Forma pusilla is just about 

 one-half the size given by Boldt and West & West, I.e. The only 

 measurement of /3 altum that I have for New South Wales is 

 long. 54, lat. 48, lat. corp. infra proc. 22, lat. isth. 15; the end-view 

 and verrucation are the same. The diameter of the body and 

 isthmus seem to point to the specific identity of these forms. The 

 specimens of St. Sebaldi and /3 altum that I have seen mature all 

 had the marginal spines in end-view, one for each apical verruca. 

 Compare Reinsch, Mittelfr. T.ll, f.lb. 



St. approximatum West & West var. centenniale, n. var. (Plate 



xiii., fig. 14). 



Semicellulse inferne cylindricacese, serie papillarum 3 supra 

 isthmum, superne cuneatse, apicibus planis, angulis superioribus 

 in radios breves, graciles, leviter curvatos, assurgentes, singulos 

 productis; radiis 5-6 denticulatis, apicibus 3-fidis. A vertice 

 semicellulse triangulares, angulis in radios graciles singulos pro- 

 ductis, granulis singulis ad bases radiorum, atque ad medium 

 latus intra marginem minoribus, ornatis. 



Long. 23-30; lat. 29-36; lat. isth. 5-6^. 



Centennial Park, Sydney; cum forma typica. 



The type is figured by West & West, in Prw. Alg. Ceylon, 

 T.22, f.5. Var. centenniale recalls St. elongatum Barker, in Wolle, 

 T.46, f.ll, 12; and St. comptum Wolle, T.42, f.43-46, but both are 

 much larger, and the latter 6-radiate. Cf. also St. parvulum 

 West & West, N. Amer. Desm. T.17, f. 1, and St. genuflexum, I.e. 

 T.17, f.2. 



St. aureolatum, n.sp. (Plate xiii., fig. 15). 



St. parvum, corpore oblongo, medio leviter constrictum sed sinu 

 nullo. Semicellulse subglobosse, apicibus rotundatis; utrinque 

 infra apices radiis glabris, ellipticis, singulis instructs, apicibus 

 radiorum obtusis non fissis. A vertice semicellulse corpore globoso. 



