Art. VII. — On Two Nein Tertiary Stylasterids.. 



(With Plate XIII.) 



By T. S. Hall, M.A. 



[Bead October IS, 1892.] 





No members of the family Stylasteridm have, I beheve, 

 been recorded as fossil.s in Austi-alia, then- small size having 

 caused them to be overlooked by collectors. The specimens 

 I have found, were obtained by washing the clays which 

 are so characteristic of our Eocene deposits. 



The airangement of the pores in the cyclosystems of both 

 species seems to warrant the formation of new genera for 

 their reception ; at any rate, they will not fit into any of 

 the genera defined by Mosele3^ 



Genus, Deontopora (gen. nov.) 



Dactylopores arranged in an arc of about three-quarters 

 of a circle round a gastropore at the centre, and absent on 

 the inner or attached edge of the c\'closystem. There are 

 no styles visible on a superficial examination in the dactylo- 

 pores, and the presence of matrix in the gastropoi-es pre- 

 vented the seai'ch for them there without mutilation of 

 what is at present, the oidy specimen I have. 



D. mooraboolensis (sp. nov.) 



The coenosteum is branched, but its general form is as 

 yet unknown. The portion found is about 1 cm. long and 

 2 mm. in diameter. The surface is composed of dense cal- 

 careous tissue, and, as in Astylas suhviridis (Moseley),* 

 is marked by conspicuous longitudinal rounded ridges, 



* " On the Structure of the Stylasteriche." Phil'. Trans., 187S, p. 4.57. 



