250 



Reg adr ella okinoseana n. sp. 



Similar to R. phoenix in form and in general arrangement of spi- 

 cules, but Avith the following characteristic features: 



The spaces between parietal openings (up to 3 mm in diameter 

 and 3 — 15 mm distant from one another) are elevated into irregular 

 ledges and protuberances that may attain a height of 20 mm. A broad 

 cuif surrounds the arched terminal sieve-plate. 



Distal ray of sword-shaped hypodermals short and mostly rounded 

 at end. This and paratangentials sparsely beset with prickles near 

 ends. 



Among the parenchymal diacts, there occur in abundance oxy- 

 hexacts with finely spinous rays of 0.055 — 0.14 mm length. 



Rosettes are present in three forms: 1) oxytetrasters or occasio- 

 nally oxyhexasters , 2) graphihexasters and 3) floricomes. In what I 

 have called oxytetrasters the principals form a regular cross and the 

 terminals, usually 4 in number to each principal, end in a point after 

 a diverging , somewhat wavy course. Floricomes similarly shaped as 

 in R. phoenix. 



Of several specimens collected, but one is in a perfectly uninjured 

 condition. The latter is 185 mm long and 7 7 mm broad at the cuff. 



Chaunoplectella cavernosa n. gen. n. sp. 



Of this I have only a fragment of an apparently bowl-shaped or 

 vase-shaped, thick-walled individual with a diameter of at least 1 60 mm 

 and contracted below to a stalk-like base. The condition of the oscu- 

 lum as well as the mode of attachment of the base is unknown. The 

 texture of the sponge is very light , delicate and cavernous. Both the 

 dermal and gastral skeletons present a rather uneven surface and con- 

 sist of an irregular network of thin loose strands. Through them are 

 seen the openings of wide aff"erent or efferent canals as oval or roun- 

 dish apertures of variable size , some being as large as 1 2 mm or more 

 in diameter. There is a very wide subdermal cavity. 



The principal parenchymals consist of loose hexacts and diacts, 

 •usually with roughened ends. Larger parenchymal hexacts have rays 

 more or less bent and often of unequal length. Besides these there are 

 smaller and more slenderly rayed hexacts, one ray of which freely 

 projects into the canalar lumen and may bear a plumicome at its free 

 end. The dermal and gastral skeletons consist solely of hypodermals 

 or hypogastrals which occur in forms of irregular hexacts , pentacts, 

 tetracts or triacts with more or less bent rays. 



Rosettes are of two kinds: 1) small plumicomes 0.05 mm in dia- 

 meter and 2) large discohexasters , 0.275 mm in diameter, with very 



