120 Proceed uif/s of tli.e Royal Society of Victoria. 



.show tliut it would be requii-ed frequently. Possibly then, 

 vvc have in this instance a near ap]»roach to the conditions 

 found in the gonangia of Cryptohe/ld. 



When other specimens of this stylasterid are available for 

 examination, the exact position of the genus in the group 

 will, probably, be determinable. The suppression of some 

 of the dactylozoids of a c3'closystem on one side of a 

 gastrozoid, occurs at times in Stylaster, and is constant in 

 GryptoJielia. In the latter case, however, the suppression 

 is accompanied by the production of a calcareous lamina 

 overhanging and pi'otecting the cyclosystem ; but it must 

 be noted that the abortion occurs on opposite faces of the 

 system in Cryjifohelia and Beontopora. In the formei-, it 

 occurs on the side of the system towards the proximal end 

 of a branch, while in the latter, it is towards the distal end. 



In Astylus, which is ])robably the nearest ally of Crypto- 

 hclia, the hoinologue of the external lid of the latter is a small 

 tongue-like projection placed somewhat deeply in the gas- 

 tropore, and dividing it into an inner and an outer chamber.* 

 Sections would, of course, require to be rubbed down to 

 settle wlietiiei- or not such a process is found in Deonfopora, 

 or whctlie)-, on the other hand, a style is developed, in the 

 former c;ise its nearest ally would be Asfylas, and in the 

 latter Stylaster. If neither stjde nor process occur, its 

 affinities would be with (Jonopora .-^ The external characters 

 point, I think, to an alliance with Astylus and GryptoheUo. 



Locality. — Grey clays, Orphanage Reserv^e, Fyansford, 

 Geelong. Only one specimen found. 



Genus Lsptobotlu-as (gen. nov.) 



The poi'es are grouped in cyclosystems ; dactylopores not 

 in radial grooves. 



The absence of grooves containing the dactylo[)ores is a 

 feature not ap})arently occurring in any genei'a in which 

 cyclosj'stems are found, though it occurs in Sporadopor a and 

 Disticliopora. 



L. spenceri (s[). nov.) 



The specimen tigiu-ed consists of a portion of a branfli 

 which is circular in section. Length b mm., diameter 1 mm. 



Moseley, op. cit., p. 458. t Id-, V- 503. 



