296 AET. 7. T. TJIMA : HEX ACTINELLTDA, TV. 



Genus AULOSACCUS T.r. 



(Diagnosis on p. 107). 



A. srimhjrf Tj, — Tliick-wallcd, vase-like; witliOLit eonuli or 

 prostiil needles on the outside. Gastral surface covered with a 

 sieve-like endosonial lattice, in which the gastralia do not form 

 a continuous layer over the meshes. Dermalia, rough pentactins 

 or predominantly pentactins. jMacrodiscohexaster, very large 

 measuring nearly 1 mm. in diameter ; sun-like, the six ])rincipals 

 heing fused into a spherical mass 40-49 /'- in diameter. Micro- 

 discohexaster, 26-38 /' in diameter. 



A. mifsu7,'ifHi I.t.— Moderately thick-walled, tulndar ; ex- 

 ternal surface with cones, from the apex of which project needle-like 

 prostalia either singly or in a small tuft. Gastral surface lined by 

 a continuous gastral layer. Dermalia, predominantly stauractins, 

 the entire surface of which is covered with rather strong prickles. 

 Macrodiscohexaster, 80-120 // in diameter ; the short knol)-like 

 ]irincipals being separate. Microdiscohexaster, 20-2o /^ in diameter. 



Genus ACANTHASCUS F. E. ScTT. 



(l)iagnasis on p. l'i]9}. 



ul. i'dcfus Y. E. i^ciT. — Cup-like, vase-like or funnel-shaped; 

 sometimes bearing a secondai'v person or persons. Dermalia, 

 predominantly stauractins, occasionally pentactins, Gastralia, 

 mostly pentactins and sometimes stauractins ; not forming a 

 continuous lattice-work. Oxyhexaster, 90-152 !>- dia.; often 

 hemihexactinose and not seldom hexactinose. Peripheral disc- 



