190 SOME NEW OR LKSS KNOWN DESMIDS FOUND IN N. S. WALES, 



Long. 30-5+; lat. 40-60^. 



Rose's Lagoon, Collector; Botany; Mosman. 



All specimens seen had the angles constricted and drawn out 

 into a short tube. The biaculeate form with inflated angles in 

 end view is probably immature. The granules in end ^iew are 

 roughly indicated in Turner's figure; they mark the corners of 

 the truncate end, and the inflated portion of the processes. 



St. TRIDENTULUM, n.sp. (T.iv. f.20). 



St. parvum, pauUo latius quam longum, medio sinu acutangulo 

 constrictum, isthmo angustissimo. Semicellulae subcuneatae, 

 supra basin leviter inflatae, dorso planae, angulis superioribus 

 aculeis geminatis et supra spinis longioribus singulis radiatini, 

 instructis. A vertice visae triangulares, lateribus levissime con- 

 cavis. angulis acutis in aculeos singulos productos. Membrana 

 glabra. Endochroma laminis geminatis 3 radiantibus disposita. 

 Nuclei amylacei singuli. 



Long. 24; lat. 30/li. 



Botany. 



(Jf. -S'^. Liheltii Rac, Desm. Nowe, p. 28-29, T.3, f.l2; St. avicula 

 Breb., in Ralfs, T.23, f. 11; and St. suhcruciatum C. tk W., in 

 Cooke, T.51, f.3. 



St. aggeratum, n.sp. (T.iv. f.21). 



St. parvum, suboctagonum, paullo latius quam longum, medio 

 sinu angustissimo (vel lineari *?) profunde constrictum, isthmo 

 angustissimo. Semicellulae subhexagonae, supra basin leviter 

 tumidae; dorso altissime convexae; apicibus truncatis; lateribus 

 sursum fere rectis denticulationibus ternis ornatis; angulis later- 

 alibus denticulis brevibus singulis munitis, denticulis parallelis 

 (interdum convergentibus). A vertice visae triangulares, lateribus 

 leviter concavis, anyulis inflatis acutis in deuticulos singulos pro- 

 ductis et granulis obscuris in seriebus transversalibus 2-3 ornatis. 

 In area centrali granulis 6 concentrice dispositis. Membrana 

 glabra. 



Long. 28; lat. 30/^i. 



Botany. 



