BY G. I. PLAYFAIR. 187 



traliaii specimens are suddenly turned inwards a little, and the 

 sinus (if sinus it can truly be called) is rounded within. 



8t. excavatum West, Alg. Madag. p. 7 8, T.8, f.42. (T.v. f.3). 



Long. 19; lat. 45/Lt. 

 Centennial Park. 



St. coralloideum, n.sp. (T.v. f.4). 



St. mediocre, paullo latius quam longum, ad latera profunde et 

 late excav^ata, medio sinu brevissimo acuto constrictum, isthmo 

 angustissimo. Semicellulae supra basin leviter tumidae, dorso 

 leviter convexae, parte superiore in processus rectos, longos, validos 

 productae; processibus utrinque, verrucis (vel spinis coralloideis) 

 in seriebus transversalibus 5 ordinatis, asperrimis; apicibus 4-fidis 

 spinis coralloideis. Inflatione basali seriebus transversalibus 

 binis granulorum ornata. A vertice semicellulae triangulares, 

 angulis protractis 4-tidis, lateribus concavis -verrucis vel spinis 

 circa 16 asperrimis, intra niMrgines verrucis in seriebus singulis 

 ordinntis. 



Long. 42-48; lat. 50-68/x. 



Botany, Centennial Park, Mosman. 



This species belongs to that group of rayed Staurastra which 

 have spines or verrucae along the sides in end view. It includes 

 St. vesfAtum Ralfs (?); St. aculeatumCKhw), see Ralfs, T.23, f.1-2; 

 St. S'ihaldl Rein., Mittelfr., T.l, f.ll; St. pseudosebaldi Wille, 

 Norges Desm. T.2, f.30; St. concinjiimi West, Desm. U. S. 1898, 

 T.18, f.7; and *S'^. Manfeldtii Delp., Subalp. T.13, f.8-10, the last 

 being the nearest. Cf. ?dso St. Heimerlianum var. spinidosum 

 Lutk., Desm. Oberoster. 'J\2, f.l7. 



St. volans West /3 elegans, n.var. (T.v. f.5). 



]Ma.jor quam forma typica, basi inierdum globoso (sursuni 

 inflata) serie unica minutoruni granulorum ornato: a|>icibus 

 iiiterdum truncatis; processibus 8-1 1 undulatis 2--l-fidis; dentibus 

 vulgo minoribus. A vertice visa et cetera ut in forma typica. 



Long. s. proc. 24-27; lat. c. proc. 52-67/x. 



